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DIODE 

    

Transient Voltage Suppression

   Diode Devices

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.
Specifications, descriptions and illustrative material in this literature are 

as accurate as known at the time of publication, but are subject to change 

without notice. Visit 

www.Littelfuse.com

 for more information.

TVS Diode Product Selection Guide

table of Contents

TVS Diode Overvoltage Suppression Facts 

TVS Diode Transient Voltage Scenarios  

TVS Diode Device Typical Applications

TVS Diode FIT Calculation Method and TVS Transients Clamping Waveform

TVS Diode Selection Checklist and TVS Diode Terms & Definitions

Legal Disclaimers

Series Name

Photo

Package Type

Reverse Standoff Voltage 

(V

R

)

Peak Pulse Power 

Range

†

 (P

PP

10/1000μs)

  

Peak Pulse 

Current

(I

PP

 8/20μs)

Operating Temperature

Halogen- Free

RoHS  Compliant

Surface Mount-Standard Application

 (200-5000W)

SMF

SOD-123

5.0-54

200W

-85° to +302° F 

(-55° to +150° C)

• 

• 

SMAJ

DO-214AC

5.0-440

400W

• 

• 

P4SMA

DO-214AC

5.8-495

400W

• 

• 

SMA6J

DO-214AC

5.0-12

600W

• 

• 

SMA6L

DO-221AC

5.0-85

600W

• 

• 

SACB

DO-214AA

5.0-50

500W

• 

• 

SMBJ

DO-214AA

5.0-440

600W

• 

• 

P6SMB

DO-214AA

5.8-495

600W

• 

• 

1KSMB

DO-214AA

5.8-136

1000W

• 

• 

SMCJ

DO-214AB

5.0-440

1500W

• 

• 

1.5SMC

DO-214AB

5.8-495

1500W

• 

• 

3.0SMC

DO-214AB

20-33

•

•

SMDJ

DO-214AB

5.0-220

3000W

• 

• 

5.0SMDJ

DO-214AB

12-170 

5000W

• 

• 

Axial Leaded-Standard Application

 (400-5000W)

P4KE

DO-41

5.8-495

400W

-85° to +302° F 

(-55° to +150° C)

• 

• 

SA

DO-15

5.0-180

500W

• 

• 

SAC

DO-15

5.0-50

500W

• 

• 

P6KE

DO-15

5.8-512

600W

• 

• 

1.5KE

DO-201

5.8-512

1500W

• 

• 

LCE

DO-201

6.5-90

1500W

• 

• 

3KP

P600

5.0-220

3000W

• 

• 

5KP

P600

5.0-250

5000W

• 

• 

Axial Leaded-High Power

(15000-30000W; 1-15kA)

15KPA

P600

17-280

15000W

-85° to +302° F 

(-55° to +150° C)

• 

• 

20KPA

P600

20-300

20000W

• 

• 

30KPA

P600

28-288

30000W

• 

• 

AK1

Radial Lead

76

1000A

-85° to +257° F 

(-55° to +125° C)

• 

• 

AK3

Radial Lead

15-430

3000A

• 

• 

AK6

Radial Lead

30-430

6000A

• 

• 

AK10

Radial Lead

30-530

10000A

• 

• 

AK15

Radial Lead

58-76

15000A

• 

• 

Automotive

SLD

P600

10-36

2200 based on 

10ms/150ms pulse

-85° to +302° F 

(-55° to +150° C)

• 

• 

   

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 

Revised: 09/13/13

Transient Threats  – What Are Transients?

Voltage Transients are defined as short duration surges of 
electrical energy and are the result of the sudden release 
of energy previously stored or induced by other means, 
such as heavy inductive loads or lightning. In electrical 
or electronic circuits, this energy can be released in a 
predictable manner via controlled switching actions, or 
randomly induced into a circuit from external sources.

Repeatable transients are frequently caused by the 
operation of motors, generators, or the switching of 
reactive circuit components. Random transients, on the 
other hand, are often caused by Lightning and Electrostatic 
Discharge (ESD). Lightning and ESD generally occur 
unpredictably, and may require elaborate monitoring to be 
accurately measured, especially if induced at the circuit 
board level. Numerous electronics standards groups have 
analyzed transient voltage occurrences using accepted 
monitoring or testing methods. The key characteristics of 
several transients are shown in the table below.

VOLTAGE  CURRENT  RISE-TIME  DURATION

Lighting 

25kV 

20kA 

10 µs 

1ms

Switching 

600V 

500A 

50µs 

500ms

EMP 

1kV 

10A 

20ns 

1ms

ESD 

15kV 

30A 

<1ns 

100ns

Table 1. Examples of transient sources and magnitude

Characteristics of Transient Voltage Spikes

Transient voltage spikes generally exhibit a “double 
exponential” wave, as shown below for lightning and ESD.

t1

t2

lpp

lpp/2

t

Figure 1. Lightning Transient Waveform

100%

90%

I    

I    

10%

30n

60n

tr = 0.7 to 1.0ns

Cur

rent (I) 

%

30

60

Figure 2. ESD Test Waveform

The exponential rise time of lightning is in the range 
1.2µsec to 10µsec (essentially 10% to 90%) and the 
duration is in the range of 50µsec to 1000µsec (50% of 
peak values). ESD on the other hand, is a much shorter 
duration event. The rise time has been characterized at less 
than 1.0ns. The overall duration is approximately 100ns.

Why are Transients of Increasing Concern?

Component miniaturization has resulted in increased 
sensitivity to electrical stresses. Microprocessors for 
example, have structures and conductive paths which 
are unable to handle high currents from ESD transients. 
Such components operate at very low voltages, so 
voltage disturbances must be controlled to prevent device 
interruption and latent or catastrophic failures. 

Sensitive microprocessors are prevelant today in a wide 
range of devices. Everything from home appliances, such 
as dishwashers, to industrial controls and even toys use 
microprocessors to improve functionality and efficiency.

Most vehicles now also employ multiple electronic 
systems to control the engine, climate, braking and, in 
some cases, steering, traction and safety systems. 

Many of the sub- or supporting components (such as 
electric motors or accessories) within appliances and 
automobiles present transient threats to the entire system. 

Careful circuit design should not only factor environmental 
scenarios but also the potential effects of these related 
components. Table 2 below shows the vulnerability of 
various component technologies.

Device Type

Vulnerability (volts)

VMOS

30-1800

MOSFET

100-200

GaAsFET

100-300

EPROM

100

JFET

140-7000

CMOS

250-3000

Schottky Diodes

300-2500

Bipolar Transistors

380-7000

SCR

680-1000

Table 2: Range of device vulnerability.

TVS Diode Overvoltage Suppression Facts

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

Electrostatic Discharge (ESD)

Electrostatic discharge is characterized by very fast 
rise times and very high peak voltages and currents. 
This energy is the result of an imbalance of positive and 
negative charges between objects.

ESD that is generated by everyday activities can far surpass 
the vulnerability threshold of standard semiconductor 
technologies. Following are a few examples:

• 

Walking across a carpet:

 

35kV @ RH = 20%;1.5kV @ RH = 65%

• 

Walking across a vinyl floor:

 

12kV @ RH = 20%;250V @ RH = 65%

• 

Worker at a bench:

 

 6kV @ RH = 20%;100V @ RH = 65%

• 

Vinyl envelopes:

 

7kV @ RH = 20%;600V @ RH = 65%

• 

Poly bag picked up from desk:

 

20kV @ RH = 20%;1.2kV @ RH = 65%

Lightning  Induced Transients

Even though a direct strike is clearly destructive, transients 
induced by lightning are not the result of a direct strike. 

When a lightning strike occurs, the event creates a 
magnetic field which can induce transients of large 
magnitude in nearby electrical cables.

A cloud-to-cloud strike will 
effect not only overhead cables, 
but also buried cables. Even a 
strike 1 mile distant (1.6km) can 
generate 70 volts in electrical 
cables.

In a cloud-to-ground strike (as 
shown at right) the transient-
generating effect is far greater.

This diagram shows a typical 
current waveform for induced 
lightning disturbances.

Inductive Load Switching

The switching of inductive loads generates high energy 
transients which increase in magnitude with increasingly 
heavy loads. When the inductive load is switched off, the 
collapsing magnetic field is converted into electrical energy 
which takes the form of a double exponential transient. 
Depending on the source, these transients can be as large 
as hundreds of volts and hundreds of Amps, with duration 
times of 400 milliseconds.

Typical sources of inductive transients include:

    • 

Generator

  • 

Motor

    • 

Relay

 

• 

Transformer

These examples are common in electrical and electronic 
systems. Because the sizes of the loads vary according 
to the application, the wave shape, duration, peak current 
and peak voltage are all variables which exist in real world 
transients. Once these variables can be approximated, a 
suitable suppressor technology can be selected.
The diagram at right shows a 
transient which is the result 
of stored energy within the 
alternator of an automobile 
charging system. 

A similar transient can also be 
caused by other DC motors 
in a vehicle. For example, 
DC motors power amenities 
such as power locks, seats 
and windows. These various 
applications of a DC motor can produce transients that are 
just as harmful to the sensitive electronic components as 
transients created in the external environment.

T

T

1

V

B

V

S

 = 25V to 125V

V

B

 = 14V

  T= 40ms to 400ms

V

S

90%

10%

t

V

T

1

 = 5ms to 10ms

 R = 0.5

Ω

 to 4

Ω

PERCENT

 OF PEAK V

ALUE

100

90

50

10

O1

t

t1
t2

TIME

TVS Diode Transient Voltage Scenarios

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 

Revised: 09/13/13

TVS Diode Device Typical Applications

DC Supply Protection

DC Load Protection

EMI Limiting

A.C. Supply Protection

+

Load

Circuit

Breaker

Options

 

DC input

AC input

Rectifier
Network

To Load

Load

DC Input

DC output

DC motor

+

-

R

(A)

R

L

I

C

+

-

(B)

+

-

- OR -

Operational Amplifier

TVS

TVS

TVS

TVS

TVS

TVS

MOV + Choke + TVS Combination:

MOV + TVS Combination:

TVS

MOV

TVS Diode

Low Clamping 

Voltage

MOV Varistor

High Energy 

Withstand

Inductor

TVS

Capacitor

MOV

TVS Diode

SMBJ28A/SMBJ30A
SMCJ28A/SMCJ30A

MOV Varistor

V33ZA70PX

Special low voltage

20mm diameter MOV

3KA@8/20µs (1 time)

Choke

Choke

24VDC

GND

DC Supply Protection

DC Load Protection

AC Supply Protection

Elector-Magnetic Interference Limiting

Operational Amplifier Protection

DC Supply Protection

DC Load Protection

EMI Limiting

A.C. Supply Protection

+

Load

Circuit

Breaker

Options

 

DC input

AC input

Rectifier
Network

To Load

Load

DC Input

DC output

DC motor

+

-

R

(A)

R

L

I

C

+

-

(B)

+

-

- OR -

Operational Amplifier

TVS

TVS

TVS

TVS

TVS

TVS

DC Supply Protection

DC Load Protection

EMI Limiting

A.C. Supply Protection

+

Load

Circuit

Breaker

Options

 

DC input

AC input

Rectifier
Network

To Load

Load

DC Input

DC output

DC motor

+

-

R

(A)

R

L

I

C

+

-

(B)

+

-

- OR -

Operational Amplifier

TVS

TVS

TVS

TVS

TVS

TVS

DC Supply Protection

DC Load Protection

EMI Limiting

A.C. Supply Protection

+

Load

Circuit

Breaker

Options

 

DC input

AC input

Rectifier
Network

To Load

Load

DC Input

DC output

DC motor

+

-

R

(A)

R

L

I

C

+

-

(B)

+

-

- OR -

Operational Amplifier

TVS

TVS

TVS

TVS

TVS

TVS

DC Supply Protection

DC Load Protection

EMI Limiting

A.C. Supply Protection

+

Load

Circuit

Breaker

Options

 

DC input

AC input

Rectifier
Network

To Load

Load

DC Input

DC output

DC motor

+

-

R

(A)

R

L

I

C

+

-

(B)

+

-

- OR -

Operational Amplifier

TVS

TVS

TVS

TVS

TVS

TVS

Combined MOV Varistor and TVS Diode Protection Scenarios

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

Telecom DC/DC Protection

Telecom DC/DC Protection Circuit 

48VDC

AC 220V

AK6

TVS

Diode

TVS Diode

SMCJ  or 

AK3 Series

LVSP

Fuse

For 48vdc Lightning Protection:
TVS Diode: AK6-66CL
Lightning Fuse: LVSP15-R
Power fuse: TLS035L/456020

For 5vdc Lightning Protection:
Fuse: 461 Series
TVS:AK3-7.5CL, 5.0SMDJ

Nano Fuse 

461 Series

Power Fuse

30A - 50A

AC/DC

DC/DC

Circuit Protection of 24VDC with High Surge Capatbility

O

u

ts

id

e 

W

o

rl

d

Shield Ground

Primary
Protection:
AK10-030
TVS Diode

Cx

Cy

CM Choke

NM Choke

SMDJ28A
TVS Diode

Circuit Protection of 24VDC with high surge capability

Cx

Fuse

0451001

Fuse

0451001

Pulse Width Modulated (PWM) Driver Protection

Power Over Ethernet (PoE) Protection

TVS for PWM (Pulse Width Modulated)
driver protection

400VDC

PWM

Secondary

Power Over Ethernet PoE protection 

PSE

Power 

Sourcing

Equipment

PWM

Driver and

Feedback

Control 

+Vin

-Vin

TVS Diode
SMBJ58A

Vout

Ethernet and PD controller

TVS

TVS for PWM (Pulse Width Modulated)
driver protection

400VDC

PWM

Secondary

Power Over Ethernet PoE protection 

PSE

Power 

Sourcing

Equipment

PWM

Driver and

Feedback

Control 

+Vin

-Vin

TVS Diode
SMBJ58A

Vout

Ethernet and PD controller

TVS

TVS Diode Device Typical Applications 

(continued)

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 

Revised: 09/13/13

RS485 Interface Protection

RS485 Interface protection

GDT
SL1421A090

TVS

FUSE

0461.600

CHOKE

FUSE

0461.600

TVS
SMBJ6.0CA

3
2
1

VDD5V

VDD5V

8
7
6
5

1
2
3
4

RXD
SEN

TXD

RO

RE

DE

DI

VCC
B
A
GND

GDT
SL1411A075SM

GDT
SL1411A075SM

GDT
SL1411A075SM

GDT
SL1411A075SM

GDT
SL1411A075SM

GDT
SL1411A075SM

TVS
SMDJ15CA

TVS
SMDJ15CA

TVS
SMDJ15CA

TVS
SMDJ15CA

RS232 TX

RS232RX

RS232GND

TVS
SMDJ15CA

PGND

PGND

FUSE

04611.25ER

FUSE

04611.25ER

FUSE

04611.25ER

1

6

2

7

3

8

4

9

5

TVS
SMDJ15CA

RS232 interface protection with high surge requirement 

LED Driver

L

N

85 - 135

VAC

RV1

140 VAC

C3

100 nF

500 V

C1

33 nF
630 V

VR2

SMAJ350A

C2

68 nF
250 V

L3

EE10

330 μH

C7

22 μF

50 V

VR1

1N4756A

47 V

35 V, 130 mA

C6

10 nF

50 V

R4

3.3 kΩ

L1

1.2 mH

R3

3.3 kΩ

R1

3.3 kΩ

L2

1.2 mH

R3

2.2 Ω

1%

C4

1 μF
16 V

RTN

R5

PI-6539-051411

D2

DFLS1200-7

3

1

F1

5 A

D

S

BR1

MB6S

600 V

C5

1 μF
16 V

BP

FP

D1

DFL5160-7

LinkSwitch-PL

U1

LNK458KG

CON

TROL

TVS Diode Device Typical Applications 

(continued)

LED Driver Protection

RS232 Interface Protection with High Surge Requirement

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

TVS Diode FIT Calculation Method 

Reference

JEDEC JESD 85, methods for calculating failure rates in 

units of FITs
JEDEC JESD 91A, method for developing acceleration 

models for electronic component failure mechanisms.

Life Test

FIT is calculated based on life test result.
Littelfuse conducts Blocking test as following condition at 

any qualification or on-going reliability monitoring activity.
Temperature: 150°C, Duration: 504 hours, Sample number: 

40
Note, this is minimum requirement and the duration and 

sample number could be increased per test purpose.

Acceleration Factor

Acceleration Factor or AT is calculated per JEDEC JESD 

91A, Arrhenius equation with Eaa (activation energy) of 

1.0eV by dielectric breakdown mechanism.
A

T

 = exp[(-Eaa/k)(1/Tt - 1/ Ts )]

A

T

: the acceleration factor due to changes in temperature

Eaa: the apparent activation energy (eV)
k: Boltzmann’s constant (8.62 × 10

-5

 eV/K)

Tt: the absolute temperature of the test (K)
Ts: the absolute temperature of the system (K)
From the life test, Tt = 150°C, assuming Ts = 30°C, 

acceleration factor is
A

T

 = exp[(-1/8.62 × 10

-5

)(1/(150+273.16) - 1/(30+273.16)] 

= 5.2 × 10

4

Failure Rate Calculation

Failure rate or 

λ

CL

 is calculated per JEDEC JESD 85, using 

the upper confidence bound of the failure rate.

λ

CL

 = X2(CL, 2f+2) × 10

9

 / (2 × t × ss × A)

λ

CL

: Failure rate in FIT

X2: Chi-square distribution function
CL: confidence level
f: number of failures
t: test time in hours
ss: number of samples
A: acceleration factor
From life test result, f=0, t= 504 hours, ss =40.Assuming 

Ts=30°C, and using CL=60%, failure rate is

λ

CL

 = X2(60%, 2) × 10

9

 / (2 × 504 × 40 × 5.2 × 10

4

)

= 1.897 × 10

9

 / (2 × 504 × 40 × 5.2 × 10

4

)

= 0.9 FIT
Note: the published reliability test report usually rounds up 

the failure rate to 1 FIT at 30°C.

Voltage Transients

Time

Voltage Cross TVS

IPP Cross  TVS

Voltage or Current

Normal operating 

voltage of the circuit

Normal operating

voltage of the circuit

VR

TVS Transients Clamping Waveform

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 

Revised: 09/13/13

TVS Diode Selection Checklist

1. Define Circuit Operating Parameters

Normal operating voltage type in DC or AC:  

Device Type Required:   Uni-drectional  Bi-directional

Normal operating voltage in volts:  

 

Maximum transient current (Ipp):  

 

Maximum clamping voltage (Vc):    

 

Required peak reverse surge power rating:  

Product mounting type (package):  

 

Operating temperature: 

 

   

2. Narrow TVS Diode Series for the Application

Please refer to the product selection charts and data 
sheets within this guide, factoring these key parameters:

Reverse  Standoff Voltage 

(V

R

)

:

 

The device 

V

R

 should be equal to, or great than, the 

peak operating level of the circuit (or part of the circuit) 
to be protected. This is to ensure that TVS Diode does 
not clip the circuit drive voltage.

Peak Pulse Current 

(I

PP

)

:

 

The Peak Pulse Current 

(I

PP

)

 identifies the maximum 

current the TVS Diode can withstand without damage. 
The required 

I

PP

 can only be determined by dividing the 

peak transient voltage by the source impedance. Note 
that the TVS Diode failure mechanism is a short circuit; if 
the TVS Diode fails due to a transient, the circuit will still 
be protected.

Maximum  Clamping Voltage 

(V

C

)

:

 

This the peak voltage that will appear across the TVS 
Diode when subjected to the Peak Pulse Current 

(I

PP

)

, 

based on 10/1000µs exponential waveform. The V

C

 of 

each TVS Diode is identified in each series data sheet 
electrical characteristics table.

3. Verify Ambient Operating Parameters

Ensure that the application voltage is less than or equal 
to the device’s standoff voltage, and that the operating 
temperature limits are within those specified by the device.

4. Verify Device Mounting Style and Dimensions

Please refer to the dimension drawings contained within 
the data sheet of each series.

5. Test the Selected Device in Actual Application 

Please contact Littelfuse if you would like assistance 
with testing and verifying suitability of a Littelfuse device 
within your product. We have extensive product testing lab 
capabilities and technical expertise to assist you.

Clamping Device

TVS is a clamping device that limits voltage spikes by low 
impedance avalanche breakdown of a rugged silicon PN 
junction. It is used to protect sensitive components from 
electrical overstress generated by induced lightning, inductive 
load switching and electrostatic discharge.

Operating Temperature  Range

The minimum and maximum ambient operating temperature 
of the circuit in which a device will be applied. Operating 
temperature does not allow for the effects of adjacent 
components, this is a parameter the designer must take into 
consideration.

Capacitance

The property of a circuit element that permits it to store 
an electrical charge. In circuit protection, the off-state 
capacitance is typically measured at 1 MHz.

Reverse Standoff Voltage (V

R

)

In the case of a uni-directional TVS diode, this is the 
maximum peak voltage that may be applied in the ‘blocking 
direction’ with no significant current flow. In the case of 
a bi-directional transient, it applies in either direction. It is 
the same definition as Maximum Off-state Voltage and 
Maximum Working Voltage.

Breakdown Voltage  (V

BR

)

Breakdown voltage measured at a specified DC test current, 
typically 1mA. Usually a minimum and maximum is specified.

Peak Pulse Current (I

PP

)

Maximum pulse current which can be applied repetitively. 
Usually a 10/1000µs double exponential waveform, but can 
also be 8/20µs, if stated.

Maximum Clamping Voltage (V

C 

or V

CI

)

Maximum voltage which can be measured across the 
protector when subjected to the Maximum Peak Pulse 
Current.

Peak Pulse Power (P

PP

)

Expressed in Watts or Kilowatts, for a 1ms exponential 
transient (see figure 1, page 31) it is I

PP

 multiplied by V

CL

.

Clamp Voltage

line

V

Clamping Device

TVS Diode Terms & Definitions

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

Liability

Littelfuse, Inc. its affiliates, agents, and employees,
and all persons acting on its or their behalf (collectively,
“Littelfuse”), disclaim any and all liability for any errors,
inaccuracies or incompleteness contained here or in any
other disclosure relating to any product. Littelfuse disclaims
any and all liability arising out of the use or application
of any product described herein or of any information
provided herein to the maximum extent permitted by law.
The product specifications do not expand or otherwise
modify Littelfuse terms and conditions of purchase,
including but not limited to the warranty expressed therein,
which apply to these products.

Right to Make Changes

Littelfuse reserves the right to make any and all changes to
the products described herein without notice.

Not Intended for Use in Life Support or Life Saving
Applications 

The products shown herein are not designed for use
in life sustaining or life saving applications unless
otherwise expressly indicated. Customers using or selling
Littelfuse products not expressly indicated for use in such
applications do so entirely at their own risk and agree
to fully indemnify Littelfuse for any damages arising or
resulting from such use or sale. Please contact authorized
Littelfuse personnel to obtain terms and conditions
regarding products designed for such applications.

Intellectual Property 

No license, express or implied, by estoppel or otherwise,
to any intellectual property rights is granted by this
document or by any conduct of Littelfuse. Product
names and markings noted herein may be registered
trademarks of their respective owners. Littelfuse makes
no representations or warranties of non-infringement or
misappropriation of any third party intellectual property
rights unless specifically provided for herein.

Legal Disclaimers

Disclaimer 

Specifications, descriptions and data contained in this 
document are believed to be accurate.  However, users 
should independently evaluate each product for the 
particular application. Littelfuse reserves the right to 
change any information contained herein without notice 
and may, at its sole discretion, change the design, 
manufacture or construction of any product. Visit www.
littelfuse.com for the most up-to-date information.  
Littelfuse’s only obligations for any of its products are 
specified in its Standard Terms and Conditions and 
Littelfuse shall not be liable for any indirect, consequential 
or incidental damages from any sale or use of any of its 
products.

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

Surface Mount – 200W >  SMF Series

Description

Features

Maximum Ratings and Thermal Characteristics 
(T

A

=25°C unless otherwise noted)

Parameter

Symbol

Value

Unit

Peak Pulse Power Dissipation at 

T

A

=25ºC by 10/1000µs (Note 1) 

P

PPM

200

W

Thermal Resistance Junction- to- 

Ambient

R

THJ-A

220

°C/W

Thermal Resistance Junction- to- 

Lead

R

THJ-L

100

°C/W

Operating and Storage Temperature 

Range

T

J,

T

STG

-55 to 150

°C

Notes:

1.  Non-repetitive current pulse, per Fig. 4 and derated above T

A

=25ºC per Fig. 3.

The SMF series is designed specifically to protect sensitive 
electronic equipment from voltage transients induced by 
lightning and other transient voltage events.

SMF package is 50% smaller in footprint when compare to 
SMA package and deliverying low height profile (1.1mm) in 
the industry.

Applications

SMF devices are ideal for the protection of I/O interfaces, 
V

CC

 bus and other vulnerable circuit used in cellular phones, 

portable devices, business machines, power supplies and 
other consumer applications.

• Compatible with 

   industrial standard 
   package SOD-123

•  For surface mounted 

applications to optimize 
board space

•  Low profile: maximum 

height of 1.1mm.

•  Typical failure mode is 

short from over-specified 
voltage or current 

•  Whisker test is conducted 

based on JEDEC 
JESD201A per its table 4a 
and 4c

•  IEC-61000-4-2 ESD 

30kV (Air), 30kV (Contact)

•  ESD protection of data 

lines in accordance with 

IEC 61000-4-2 (IEC801-2)

•  EFT protection of data 

lines in accordance with 

IEC 61000-4-4 (IEC801-4)

• Low inductance, excellent 

clamping capability

•  200W peak pulsepower 

capability at 10/1000µs 
waveform, repetition rate 

(duty cycle): 0.01%

•  Fast response time: 

typically less than 1.0ns 
from 0 Volts to V

BR

 min

•  High temperature 

soldering: 260°C/40 

seconds at terminals

• Glass passivated junction
• Built-in strain relief
•  Meet MSL level1, per
   J-STD-020, LF maximum
   peak of 260°C
•  Matte tin lead–free plated
• Halogen-free and RoHS 

compliant

RoHS

SMF Series

Functional Diagram

Bi-directional 

Uni-directional 

Cathode 

Anode

Uni-directional

Additional Information

Datasheet

Samples

Resources

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 

Revised: 09/13/13

Surface Mount – 200W >  SMF Series

Electrical Characteristics 

(T

A

=25°C unless otherwise noted)

Part  

Number 

Marking

Breakdown 

Voltage V

BR

 

(Volts) @ I

T

Test 

Current

I

T

 

(mA)

Reverse 

Stand off 

Voltage V

R

 (V)

Maximum 

Reverse 

Leakage @ V

R

 

I

R

 (µA)

Maximum 

Peak Pulse 

Current I

pp

 

(A)

Maximum 

Clamping 

Voltage @I

pp

 

V

C 

(V)

Code

MIN

MAX

SMF5.0A

AE

6.4

7.0

10

5.0 

400

21.7

9.2

SMF6.0A

AG

6.67

7.37

10

6.0 

400

19.4

10.3

SMF6.5A

AK

7.22

7.98

10

6.5 

250

17.9

11.2

SMF7.0A

AM

7.78

8.6

10

7.0 

100

16.7

12

SMF7.5A

AP

8.33

9.21

1

7.5 

50

15.5

12.9

SMF8.0A

AR

8.89

9.83

1

8.0 

25

14.7

13.6

SMF8.5A

AT

9.44

10.4

1

8.5 

10

13.9

14.4

SMF9.0A

AV

10.0 

11.1

1

9.0 

5

13

15.4

SMF10A

AX

11.1

12.3

1

10 

2.5

11.8

17

SMF11A

AZ

12.2

13.5

1

11 

2.5

11

18.2

SMF12A

BE

13.3

14.7

1 

12

2.5

10.1

19.9

SMF13A

BG

14.4

15.9

1 

13

1.0

9.3

21.5

SMF14A

BK

15.6

17.2

1 

14

1.0

8.6

23.2

SMF15A

BM

16.7

18.5

1 

15

1.0

8.2

24.4

SMF16A

BP

17.8

19.7

1 

16

1.0

7.7

26

SMF17A

BR

18.9

20.9

1 

17

1.0

7.2

27.6

SMF18A

BT

20.0 

22.1

1 

18

1.0

6.8

29.2

SMF20A

BV

22.2

24.5

1 

20

1.0

6.2

32.4

SMF22A

BX

24.4

26.9

1 

22

1.0

5.6

35.5

SMF24A

BZ

26.7

29.5

1 

24

1.0

5.1

38.9

SMF26A

CE

28.9

31.9

1 

26

1.0

4.8

42.1

SMF28A

CG

31.1

34.4

1 

28

1.0

4.4

45.4

SMF30A

CK

33.3

36.8

1 

30

1.0

4.1

48.4

SMF33A

CM

36.7

40.6

1 

33

1.0

3.8

53.3

SMF36A

CP

40.0 

44.2

1 

36

1.0

3.4

58.1

SMF40A

CR

44.4

49.1

1 

40

1.0

3.1

64.5

SMF43A

CT

47.8

52.8

1 

43

1.0

2.9

69.4

SMF45A

CV

50.0 

55.3

1 

45

1.0

2.8

72.7

SMF48A

CX

53.3

58.9

1 

48

1.0

2.6

77.4

SMF51A

CZ

56.7

62.7

1 

51

1.0

2.4

82.4

SMF54A

DE

60.0 

66.3

1 

54

1.0

2.3

87.1

Notes:

 1. V

BR

 measured after I

T

 applied for 300µs, I

T

 = sequare wave pulse or equivalent.

 2. Surge current waveform per 10/1000µs exponential wave and derated per Fig.2.
 3. All terms and symbols are consistent with ANSI/IEEE C62.35.

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

Surface Mount – 200W >  SMF Series

Ratings and Characteristic Curves 

(T

A

=25°C unless otherwise noted)

Voltage Transients

Time

Voltage Across TVS

Current Through TVS

Voltage or Current

Figure 1 - TVS Transients Clamping Waveform

0.1

1

10

0.000001

0.00001

0.0001

0.001

t

d

-Pulse Width (sec.)

P

PPM

-Peak Pulse Power (kW

)

Figure 2 - Peak Pulse Power Rating Curve

I-V Curve Characteristics

P

PPM

 Peak Pulse Power Dissipation

 -- Max power dissipation 

V

R  

  

  

Stand-off Voltage

 -- Maximum voltage that can be applied to the TVS without operation

V

BR    

Breakdown Voltage

 -- Maximum current that flows though the TVS at a specified test current (I

T

)

V

C   

 

  

Clamping Voltage

 -- Peak voltage measured across the suppressor at a specified Ippm (peak impulse current)

I

R       

Reverse Leakage Current 

-- Current measured at V

R

V

F      

Forward Voltage Drop for Uni-directional

 

Vc V

BR

V

R

I

R

I

T

I

pp

V

Uni-directional

V

F

continues on next page.

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 

Revised: 09/13/13

Surface Mount – 200W >  SMF Series

Ratings and Characteristic Curves 

(T

A

=25°C unless otherwise noted)

 

(Continued)

0

0.4

0.5

0.6

0.7

0.8

0.9

-55

10

75

140

Temperature (ºC)

V

f

 - Typical forward dropped voltage

Figure 6 - Forward Voltage

0

20

40

60

80

100

0

25

50

75

100

125

150

175

T

A

-Ambient temperature (ºC)

Peak Pulse Power (P

PP

) or Current (I

PP

)

Derating in Percentage 

%

Figure 3 - Pulse Derating Curve

I

PPM

- P

eak P

ulse Cur

rent, % 

I

RSM

0

0

50

100

150

1.0

2.0

3.0

4.0

tr=10µsec

Peak Value
IPPM

IPPM

2

TJ=25°C

Pulse Width(td) is defined
as the point where the peak 
current decays to 50% of IPPM

10/1000µsec. Waveform
as defined by R.E.A

td

t-Time (ms)

Half Value
IPPM

(   )

Figure 4 - Pulse Waveform - 10/1000

µ

S

0

0.25

0.50

0.75

1.00

1.25

1.50

0

25

50

75

100

125

150

175

P

M(A

V)

, Steady State Power Dissipation (W

)

T

L

 - Tab temperature (ºC)

Figure 5 - Steady State Power Dissipation          

Derating Curve

10

100

1000

10000

1

10

100

V

br

 - Reverse breakdown voltage

C

j

 (pf)

Measured@50%Vr

Measured@Vr=0v

Figure 7 - C

j

 vs. Working Peak Reverse Voltage

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

Surface Mount – 200W >  SMF Series

Physical Specifications

Case

SOD-123 plastic over glass passivated junction

Polarity

 Color band denotes cathode except bipolar

Terminal

Matte tin-plated leads, solderable per JESD22-B102D

Environmental Specifications

High Temp.  Storage

JESD22-A103

HTRB

JESD22-A108

Thermal Shock

JESD22-A106

MSL

JEDEC-J-STD-020C, Level 1

H3TRB

JESD22-A101

RSH

JESD22-B106C

Soldering Parameters

Te

mperature (T

)

Time (t)

T

s(min)

T

s(max)

T

L

T

P

t

s

Preheat

t

L

t

p

Ramp-up

Critical Zone

T

L

 to T

P

Ramp-down

t 25˚C to Peak

25˚C

Reflow Condition

Lead–free assembly

Pre Heat

- Temperature Min (T

s(min)

)

150°C 

- Temperature Max (T

s(max)

)

200°C

- Time (min to max) (t

s

)

60 – 180 secs

Average ramp up rate (Liquidus Temp 
(T

L

) to peak

3°C/second max

T

S(max)

  to T

L

 - Ramp-up Rate

3°C/second max

Reflow

- Temperature  (T

L

) (Liquidus)

217°C 

- Time (min to max) (t

s

)

60 – 150 seconds

Peak Temperature  (T

P

)

260

+0/-5

 °C

Time within 5°C of actual peak 
Temperature (t

p

)

20 – 40 seconds

Ramp-down Rate

6°C/second max

Time 25°C to peak Temperature (T

P

)

8 minutes Max.

Do not exceed

260°C

Dimensions

 - 

SOD-123 Package

Dimensions

Millimeters

Inches

Min

Max

Min

Max

A

2.50

2.90

0.0984

0.1142

B

3.40

3.90

0.1339

0.1535

C

0.70

1.20

0.0275

0.0472

D

1.50

2.00

0.0591

0.0787

E

0.35

0.90

0.0138

0.0354

F

0.05

0.26

0.0020

0.0102

G

0.00

0.10

0.0000

0.0039

H

0.95

1.10

0.0374

0.0433

A

B

C

D

E

E

F

H

G

1.6 (0.062)

1.3 (0.051)

1.4 (0.055)

Mounting Pad Layout

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 

Revised: 09/13/13

Surface Mount – 200W >  SMF Series

Part Numbering System

 V

R 

VOLTAGE

5%

 V

BR 

VOLTAGE TOLERANCE

SMF   xx  A

SERIES

Part Marking System

Packaging

Part number

Component Package 

Quantity

Packaging Option

Packaging Specification

SMFXXX

SOD-123

3000

Tape & Reel – 8mm/7” tape

EIA RS-481

XX

Marking Code

e Band

d

o

h

t

a

C

L

F

YM

Trace Code Marking

  Y:Year Code
  M: Month Code

(for uni-directional products only)

Cathode

Tape and Reel Specification 

0.31

(8.0)

0.157

(4.0)

0.157

(4.0)

0.33

(8.5)

0.80 (20.2) 

Arbor Hole Dia.

7.0 (178) 

Dimensions are in inches
(and millimeters).

Direction of Feed

0.059 DIA

(1.5)

Cover tape

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

Surface Mount – 400W  >  SMAJ series

Description

Agency Approvals

AGENCY

AGENCY FILE NUMBER

E230531

Features

Maximum Ratings and Thermal Characteristics 
(T

A

=25°C unless otherwise noted)

Parameter

Symbol

Value

Unit

Peak Pulse Power Dissipation at 

T

A

=25ºC by 10/1000µs Waveform 

(Fig.2)(Note 1), (Note 2) 

P

PPM

400

W

Power Dissipation on Infinite Heat 

Sink at T

A

=50°C

P

M(AV)

3.3

W

Peak Forward Surge Current, 8.3ms 

Single Half Sine Wave (Note 3)

I

FSM

40

A

Maximum Instantaneous Forward 

Voltage at 25A for Unidirectional  

Only (Note 4)

V

F

3.5V/6.5

V

Operating Junction and Storage 

Temperature Range

T

J

, T

STG

-55 to 150

°C

Typical Thermal Resistance Junction 

to Lead

R

uJL

30

°C/W

Typical Thermal Resistance Junction 

to Ambient

R

uJA

120

°C/W

Notes:

1.  Non-repetitive current pulse, per Fig.4 and derated above T

A

=25ºC per Fig. 3.

2. Mounted on 5.0x5.0mm copper pad to each terminal.
3. Measured on 8.3ms single half sine wave or equivalent square wave for unidirectional

 

device only.

4. V

F

 < 3.5V for V

BR

 _

< 

200V and V

F

< 6.5V for V

BR  

_

>

 201V.

The SMAJ series is designed specifically to protect 
sensitive electronic equipment from voltage transients 
induced by lightning and other transient voltage events.

Applications

TVS devices are ideal for the protection of I/O Interfaces, 
V

CC

 bus and other vulnerable circuits used in Telecom, 

Computer, Industrial and Consumer electronic applications.

•  Excellent clamping 

capability

•  Typical I

R

 less than 1µA 

above 12V

•  For surface mounted 

applications to optimize 
board space

• Low profile package
•  Typical failure mode is 

short from over-specified 
voltage or current 

•  Whisker test is conducted 

based on JEDEC 
JESD201A per its table 4a 
and 4c

•  IEC-61000-4-2 ESD 

15kV(Air), 8kV (Contact)

•  ESD protection of data 

lines in accordance with 

IEC 61000-4-2 (IEC801-2)

•  EFT protection of data 

lines in accordance with 

IEC 61000-4-4 (IEC801-4)

• Built-in strain relief

•  400W Peak pulsepower 

capability at 10/1000µs 
waveform, repetition rate 

(duty cycle): 0.01%

•  Fast response time: 

typically less than 1.0ps 
from 0 Volts to V

BR

 min

• Glass passivated junction
• Low inductance
•  High temperature 

soldering: 260°C/40 

seconds at terminals

• 

V

BR

 @T

J

= V

BR

@25°C × (1+

α

T

   x (T

J

 - 25))

   (

α

T: Temperature Coefficient) 

•  Plastic package has 

underwriters laboratory 

flammability 94V-O

•  Meet MSL level1, per
   J-STD-020, LF maximum
   peak of 260°C
•  Matte tin lead–free Plated
• Halogen free and RoHS 

compliant

RoHS

SMAJ Series

Uni-directional

Bi-directional

Functional Diagram

Bi-directional 

Uni-directional 

Cathode 

Anode

Additional Information

Datasheet

Samples

Resources

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 

Revised: 09/13/13

Surface Mount – 400W  >  SMAJ series

Electrical Characteristics

.

(T

A

=25°C unless otherwise noted)

Part  

Number 

(Uni)

Part  

Number 

(Bi)

Marking

Reverse 

Stand off 

Voltage V

R

 

(Volts)

Breakdown 

Voltage V

BR

 (Volts) @ I

T

Test 

Current

I

T

 

(mA)

Maximum 

Clamping 

Voltage V

C

  

@ I

pp

 

(V)

Maximum 

Peak 

Pulse 

Current I

pp

 

(A)

Maximum 

Reverse 

Leakage I

R

 

@ V

R

(µA)

Agency 

Approval

UNI

BI

MIN

MAX

SMAJ5.0A

SMAJ5.0CA

AE

WE

5.0

6.40 

7.00 

10

9.2

43.5

800

X

SMAJ6.0A

SMAJ6.0CA

AG

WG

6.0

6.67 

7.37 

10

10.3

38.8

800

X

SMAJ6.5A

SMAJ6.5CA

AK

WK

6.5

7.22 

7.98 

10

11.2

35.7

500

X

SMAJ7.0A

SMAJ7.0CA

AM

WM

7.0

7.78 

8.60 

10

12.0

33.3

200

X

SMAJ7.5A

SMAJ7.5CA

AP

WP

7.5

8.33 

9.21 

1

12.9

31.0

100

X

SMAJ8.0A

SMAJ8.0CA

AR

WR

8.0

8.89 

9.83 

1

13.6

29.4

50

X

SMAJ8.5A

SMAJ8.5CA

AT

WT

8.5

9.44 

10.40 

1

14.4

27.8

20

X

SMAJ9.0A

SMAJ9.0CA

AV

WV

9.0

10.00 

11.10 

1

15.4

26.0

10

X

SMAJ10A

SMAJ10CA

AX

WX

10.0

11.10 

12.30 

1

17.0

23.5

5

X

SMAJ11A

SMAJ11CA

AZ

WZ

11.0

12.20 

13.50 

1

18.2

22.0

1

X

SMAJ12A

SMAJ12CA

BE

XE

12.0

13.30 

14.70 

1

19.9

20.1

1

X

SMAJ13A

SMAJ13CA

BG

XG

13.0

14.40 

15.90 

1

21.5

18.6

1

X

SMAJ14A

SMAJ14CA

BK

XK

14.0

15.60 

17.20 

1

23.2

17.2

1

X

SMAJ15A

SMAJ15CA

BM

XM

15.0

16.70 

18.50 

1

24.4

16.4

1

X

SMAJ16A

SMAJ16CA

BP

XP

16.0

17.80 

19.70 

1

26.0

15.4

1

X

SMAJ17A

SMAJ17CA

BR

XR

17.0

18.90 

20.90 

1

27.6

14.5

1

X

SMAJ18A

SMAJ18CA

BT

XT

18.0

20.00 

22.10 

1

29.2

13.7

1

X

SMAJ20A

SMAJ20CA

BV

XV

20.0

22.20 

24.50 

1

32.4

12.3

1

X

SMAJ22A

SMAJ22CA

BX

XX

22.0

24.40 

26.90 

1

35.5

11.3

1

X

SMAJ24A

SMAJ24CA

BZ

XZ

24.0

26.70 

29.50 

1

38.9

10.3

1

X

SMAJ26A

SMAJ26CA

CE

YE

26.0

28.90 

31.90 

1

42.1

9.5

1

X

SMAJ28A

SMAJ28CA

CG

YG

28.0

31.10 

34.40 

1

45.4

8.8

1

X

SMAJ30A

SMAJ30CA

CK

YK

30.0

33.30 

36.80 

1

48.4

8.3

1

X

SMAJ33A

SMAJ33CA

CM

YM

33.0

36.70 

40.60 

1

53.3

7.5

1

X

SMAJ36A

SMAJ36CA

CP

YP

36.0

40.00 

44.20 

1

58.1

6.9

1

X

SMAJ40A

SMAJ40CA

CR

YR

40.0

44.40 

49.10 

1

64.5

6.2

1

X

SMAJ43A

SMAJ43CA

CT

YT

43.0

47.80 

52.80 

1

69.4

5.8

1

X

SMAJ45A

SMAJ45CA

CV

YV

45.0

50.00 

55.30 

1

72.7

5.5

1

X

SMAJ48A

SMAJ48CA

CX

YX

48.0

53.30 

58.90 

1

77.4

5.2

1

X

SMAJ51A

SMAJ51CA

CZ

YZ

51.0

56.70 

62.70 

1

82.4

4.9

1

X

SMAJ54A

SMAJ54CA

RE

ZE

54.0

60.00 

66.30 

1

87.1

4.6

1

X

SMAJ58A

SMAJ58CA

RG

ZG

58.0

64.40 

71.20 

1

93.6

4.3

1

X

SMAJ60A

SMAJ60CA

RK

ZK

60.0

66.70 

73.70 

1

96.8

4.1

1

X

SMAJ64A

SMAJ64CA

RM

ZM

64.0

71.10 

78.60 

1

103.0

3.9

1

X

SMAJ70A

SMAJ70CA

RP

ZP

70.0

77.80 

86.00 

1

113.0

3.5

1

X

SMAJ75A

SMAJ75CA

RR

ZR

75.0

83.30 

92.10 

1

121.0

3.3

1

X

SMAJ78A

SMAJ78CA

RT

ZT

78.0

86.70 

95.80 

1

126.0

3.2

1

X

SMAJ85A

SMAJ85CA

RV

ZV

85.0

94.40 

104.00 

1

137.0

2.9

1

X

SMAJ90A

SMAJ90CA

RX

ZX

90.0

100.00 

111.00 

1

146.0

2.7

1

X

SMAJ100A SMAJ100CA

RZ

ZZ

100.0

111.00 

123.00 

1

162.0

2.5

1

X

SMAJ110A

SMAJ110CA

SE

VE

110.0

122.00 

135.00 

1

177.0

2.3

1

X

SMAJ120A SMAJ120CA

SG

VG

120.0

133.00 

147.00 

1

193.0

2.1

1

X

SMAJ130A SMAJ130CA

SK

VK

130.0

144.00 

159.00 

1

209.0

1.9

1

X

SMAJ150A SMAJ150CA

SM

VM

150.0

167.00 

185.00 

1

243.0

1.6

1

X

SMAJ160A SMAJ160CA

SP

VP

160.0

178.00 

197.00 

1

259.0

1.5

1

X

SMAJ170A SMAJ170CA

SR

VR

170.0

189.00 

209.00 

1

275.0

1.5

1

X

SMAJ180A SMAJ180CA

ST

VT

180.0

201.00 

222.00 

1

292.0

1.4

1

SMAJ200A SMAJ200CA

SV

VV

200.0

224.00 

247.00 

1

324.0

1.2

1

SMAJ220A SMAJ220CA

SX

VX

220.0

246.00 

272.00 

1

356.0

1.1

1

SMAJ250A SMAJ250CA

SZ

VZ

250.0

279.00 

309.00 

1

405.0

1.0

1

SMAJ300A SMAJ300CA

TE

UE

300.0

335.00 

371.00 

1

486.0

0.8

1

SMAJ350A SMAJ350CA

TG

UG

350.0

391.00 

432.00 

1

567.0

0.7

1

SMAJ400A SMAJ400CA

TK

UK

400.0

447.00 

494.00 

1

648.0

0.6

1

SMAJ440A SMAJ440CA

TM

UM

440.0

492.00 

543.00 

1

713.0

0.6

1

For bidirectional type having V

RWM

 of 10 volts and less, the I

R

 limit is double.

For parts without A (V

BR

 is + 10% and V

C

 is 5% higher than with A parts).

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

Surface Mount – 400W  >  SMAJ series

I-V Curve Characteristics

Ratings and Characteristic Curves 

(T

A

=25°C unless otherwise noted

Voltage Transients

Time

Voltage Across TVS

Current Through TVS

Voltage or Current

Figure 1 - TVS Transients Clamping Waveform

Figure 2 - Peak Pulse Power Rating Curve

0.1

1

10

0.000001

0.00001

0.0001

0.001

t

d

-Pulse Width (sec.)

P

PPM

-Peak Pulse Power (kW)

0.2x0.2" (5.0x5.0mm)
Copper Pad Area

Vc V

BR

V

R

I

R

I

T

I

pp

V

Uni-directional

V

F

Vc V

BR

V

R

I

R

I

T

I

pp

V

Vc

V

BR

V

R

I

pp

I

R

I

T

Bi-directional

P

PPM

 Peak Pulse Power Dissipation

 -- Max power dissipation 

V

R  

  

  

Stand-off Voltage

 -- Maximum voltage that can be applied to the TVS without operation

V

BR    

Breakdown Voltage

 -- Maximum current that flows though the TVS at a specified test current (I

T

)

V

C   

 

  

Clamping Voltage

 -- Peak voltage measured across the suppressor at a specified Ippm (peak impulse current)

I

R       

Reverse Leakage Current 

-- Current measured at V

R

V

F      

Forward Voltage Drop for Uni-directional

 

continues on next page.

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 

Revised: 09/13/13

Surface Mount – 400W  >  SMAJ series

0

20

40

60

80

100

0

25

50

75

100

125

150

175

T

A

-Ambient temperature (ºC)

Peak Pulse Power (P

PP

) or Current (I

PP

)

Derating in Percentage 

%

1

10

100

1000

10000

1.0

10.0

100.0

1000.0

Cj

 (p

F)

Tj=25ºC
f=1.0MHz
Vsig=50mVp-p

Uni-directional V=0V

Bi-directional V=0V

Uni-directional @

V

R

Bi-directional @

V

R

V

BR

 - Reverse Breakdown Voltage (V)

Figure 3 - Pulse Derating Curve

I

PPM

- P

eak P

ulse Cur

rent, % 

I

RSM

0

0

50

100

150

1.0

2.0

3.0

4.0

tr=10µsec

Peak Value
IPPM

IPPM

2

TJ=25°C

Pulse Width(td) is defined
as the point where the peak 
current decays to 50% of IPPM

10/1000µsec. Waveform
as defined by R.E.A

td

t-Time (ms)

Half Value
IPPM

(   )

Figure 4 - Pulse Waveform

Figure 5 - Typical Junction Capacitance

0

25

50

75

100

125

150

175

P

M(A

V)

, Steady State Power Dissipation (W

)

T

A

 - Ambient Temperature (ºC)

bargaining 

 

3.0

0.6

1.2

1.8

3.6

2.4

0

Figure 6 - Steady State Power Dissipation Derating 

Curve

0

5

10

15

20

25

30

35

40

45

1

10

100

Number of Cycles at 60 Hz

I

FSM

 - Peak Forward Surve Current

(A)

Figure 7 - Maximum Non-Repetitive Forward Surge 

Current Uni-Directional Only

Ratings and Characteristic Curves 

(T

A

=25°C unless otherwise noted)

 

(Continued)

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

Surface Mount – 400W  >  SMAJ series

Dimensions

Physical Specifications

Weight

0.002 ounce, 0.061 gram

Case

JEDEC DO-214AC Molded Plastic over 

glass passivated junction

Polarity

 Color band denotes cathode except Bipolar

Terminal

Matte Tin-plated leads, Solderable per 
JESD22-B102D

Dimensions

Inches

Millimeters

Min

Max

Min

Max

A

0.049

0.065

1.250

1.650

B

0.157

0.177

3.990

4.500

C

0.100

0.110

2.540

2.790

D

0.078

0.090

1.980

2.290

E

0.030

0.060

0.780

1.520

F

-

0.008

-

0.203

G

0.194

0.208

4.930

5.280

H

0.006

0.012

0.152

0.305

I

0.070

-

1.800

-

J

0.082

-

2.100

-

K

-

0.090

-

2.300

L

0.082

-

2.100

-

Environmental Specifications

Soldering Parameters

Te

mperature (T

)

Time (t)

T

s(min)

T

s(max)

T

L

T

P

t

s

Preheat

t

L

t

p

Ramp-up

Critical Zone

T

L

 to T

P

Ramp-down

t 25˚C to Peak

25˚C

Reflow Condition

Lead–free assembly

Pre Heat

- Temperature Min (T

s(min)

)

150°C 

- Temperature Max (T

s(max)

)

200°C

- Time (min to max) (t

s

)

60 – 180 secs

Average ramp up rate (Liquidus Temp 
(T

L

) to peak

3°C/second max

T

S(max)

  to T

L

 - Ramp-up Rate

3°C/second max

Reflow

- Temperature  (T

L

) (Liquidus)

217°C 

- Time (min to max) (t

s

)

60 – 150 seconds

Peak Temperature  (T

P

)

260

+0/-5

 °C

Time within 5°C of actual peak 
Temperature (t

p

)

20 – 40 seconds

Ramp-down Rate

6°C/second max

Time 25°C to peak Temperature (T

P

)

8 minutes Max.

Do not exceed

280°C

DO-214AC (SMA)

P4SMAJ

 

Cathode Band

A

D

E

G

F

H

C

B

(for uni-directional products only)

(all dimensions in mm)

I

L

K

J

Solder Pads

High Temp.  Storage

JESD22-A103

HTRB

JESD22-A108

Thermal Shock

JESD22-A106

MSL

JEDEC-J-STD-020C, Level 1

H3TRB

JESD22-A101

RSH

JESD22-B106C

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 

Revised: 09/13/13

Surface Mount – 400W  >  SMAJ series

Part Numbering System

 

V

R 

VOLTAGE

BI-DIRECTIONAL

5% V

BR 

VOLTAGE TOLERANCE

SMAJ XXX C A

SERIES

Part Marking System

Packaging

Tape and Reel Specification 

0.47

(12.0)

0.157

(4.0)

0.157

(4.0)

0.49

(12.5)

0.80 (20.2) 

Arbor Hole Dia.

13.0 (330) 

Dimensions are in inches
(and millimeters).

Direction of Feed

0.059 DIA

(1.5)

Cover tape

Part number

Component Package 

Quantity

Packaging Option

Packaging Specification

SMAJ-xxxXX

DO-214AC

5000

Tape & Reel - 12mm/13” tape

EIA STD RS-481

Cathode

F

XX

YMXXX

Marking Code

Trace Code Marking

  Y:Year Code
  M: Month Code
  XXX: Lot Code

Littelfuse Logo

Cathode Band

(for uni-directional products only)

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

Surface Mount – 400W  >  P4SMA series

Description

Agency Approvals

Features

•  Excellent clamping 

capability

•  Low incremental surge 

resistance

•  Typical I

R

 less than 1µA 

above 12V

•  For surface mounted 

applications to optimize 
board space

•  Low profile package
•  Typical failure mode is 

short from over-specified 
voltage or current 

•  Whisker test is conducted 

based on JEDEC 
JESD201A per its table 4a 
and 4c

•  IEC-61000-4-2 ESD 

15kV(Air), 8kV (Contact)

•  ESD protection of data 

lines in accordance with 

IEC 61000-4-2 (IEC801-2)

•  EFT protection of data 

lines in accordance with 

IEC 61000-4-4 (IEC801-4)

•  Built-in strain relief

• 400W peak pulse power 

capability at 10/1000µs 
waveform, repetition rate 

(duty cycles):0.01%

•  Fast response time: 

typically less than 1.0ps 
from 0V to BV min

• 

V

BR

 @T

J

= V

BR

@25°C × (1+

α

T

   x (T

J

 - 25))

   (

α

T: Temperature Coefficient) 

• Glass passivated chip 

junction

•  High Temperature 

soldering guaranteed: 
260°C/40 seconds at 

terminals

•  Plastic package has 

underwriters laboratory 

flammability 94V-O

•  Meet MSL level1, per
   J-STD-020, LF maximum
   peak of 260°C
•  Matte tin lead–free Plated
• Halogen-free and RoHS 

compliant

Applications

TVS devices are ideal for the protection of I/O Interfaces, 
V

CC

 bus and other vulnerable circuits used in Telecom, 

Computer, Industrial and Consumer electronic applications.

The P4SMA series is designed specifically to protect 
sensitive electronic equipment from voltage transients 
induced by lightning and other transient voltage events.

Maximum Ratings and Thermal Characteristics 
(T

A

=25°C unless otherwise noted)

Parameter

Symbol

Value

Unit

Peak Pulse Power Dissipation at 

T

A

=25ºC by 10/1000µs Waveform 

(Fig.2)(Note 1), (Note 2) 

P

PPM

400

W

Power Dissipation on Infinite Heat 

Sink at T

A

=50°C

P

M(AV)

3.3

W

Peak Forward Surge Current, 8.3ms 

Single Half Sine Wave (Note 3)

I

FSM

40

A

Maximum Instantaneous Forward 

Voltage at 25A for Unidirectional  

Only (Note 4)

V

F

3.5V/6.5

V

Operating Junction and Storage 

Temperature Range

T

J

, T

STG

-55 to 150

°C

Typical Thermal Resistance Junction 

to Lead

R

uJL

30

°C/W

Typical Thermal Resistance Junction 

to Ambient

R

uJA

120

°C/W

Notes:

1. Non-repetitive current pulse , per Fig. 4 and derated above T

A

 = 25°C per Fig. 3 .

2. Mounted on 0.2x0.2” (5.0 × 5.0mm) copper pad to each terminal.
3. Measured on 8.3ms single half sine wave or equivalent square wave for unidirectional 

device only, duty cycle=4 per minute maximum.

4. V

F

<3.5V for V

BR 

_

< 

200V and V

F

<6.5V for V

BR  

_

> 

201V.

AGENCY

AGENCY FILE NUMBER

E230531

RoHS

P4SMA Series

Functional Diagram

Bi-directional 

Uni-directional 

Cathode 

Anode

Uni-directional

Bi-directional

Additional Information

Datasheet

Samples

Resources

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 

Revised: 09/13/13

Surface Mount – 400W  >  P4SMA series

Electrical Characteristics

.

(T

A

=25°C unless otherwise noted)

Part  

Number 

(Uni)

Part  

Number 

(Bi)

Marking

Reverse

Stand off

Voltage V

R

(Volts)

Breakdown 

Voltage V

BR

 (Volts) @ I

T

Test 

Current

I

T

 

(mA)

Maximum 

Clamping 

Voltage V

C

  

@ I

pp

 

(V)

Maximum 

Peak 

Pulse 

Current I

pp

 

(A)

Maximum 

Reverse 

Leakage I

R

 

@ V

R

(µA)

Agency 

Approval

UNI

BI

MIN

MAX

P4SMA6.8A P4SMA6.8CA

6V8A

6V8C

5.80

6.45

7.14

10

10.5

39.0 

1000

X

P4SMA7.5A P4SMA7.5CA

7V5A

7V5C

6.40

7.13

7.88

10

11.3

36.3 

500

X

P4SMA8.2A P4SMA8.2CA

8V2A

8V2C

7.02

7.79

8.61

10

12.1

33.9 

200

X

P4SMA9.1A P4SMA9.1CA

9V1A

9V1C

7.78

8.65

9.55

1

13.4

30.6 

50

X

P4SMA10A

P4SMA10CA

10A

10C

8.55

9.50

10.50

1

14.5

28.3 

10

X

P4SMA11A

P4SMA11CA

11A

11C

9.40

10.50

11.60

1

15.6

26.3 

5

X

P4SMA12A

P4SMA12CA

12A

12C

10.20

11.40

12.60

1

16.7

24.6 

5

X

P4SMA13A

P4SMA13CA

13A

13C

11.10

12.40

13.70

1

18.2

22.5 

1

X

P4SMA15A

P4SMA15CA

15A

15C

12.80

14.30

15.80

1

21.2

19.3 

1

X

P4SMA16A

P4SMA16CA

16A

16C

13.60

15.20

16.80

1

22.5

18.2 

1

X

P4SMA18A

P4SMA18CA

18A

18C

15.30

17.10

18.90

1

25.5

16.1 

1

X

P4SMA20A

P4SMA20CA

20A

20C

17.10

19.00

21.00

1

27.7

14.8 

1

X

P4SMA22A

P4SMA22CA

22A

22C

18.80

20.90

23.10

1

30.6

13.4 

1

X

P4SMA24A

P4SMA24CA

24A

24C

20.50

22.80

25.20

1

33.2

12.3 

1

X

P4SMA27A

P4SMA27CA

27A

27C

23.10

25.70

28.40

1

37.5

10.9 

1

X

P4SMA30A

P4SMA30CA

30A

30C

25.60

28.50

31.50

1

41.4

9.9 

1

X

P4SMA33A

P4SMA33CA

33A

33C

28.20

31.40

34.70

1

45.7

9.0 

1

X

P4SMA36A

P4SMA36CA

36A

36C

30.80

34.20

37.80

1

49.9

8.2 

1

X

P4SMA39A

P4SMA39CA

39A

39C

33.30

37.10

41.00

1

53.9

7.6 

1

X

P4SMA43A

P4SMA43CA

43A

43C

36.80

40.90

45.20

1

59.3

6.9 

1

X

P4SMA47A

P4SMA47CA

47A

47C

40.20 

44.70

49.40

1

64.8

6.3 

1

X

P4SMA51A

P4SMA51CA

51A

51C

43.60 

48.50

53.60

1

70.1

5.8 

1

X

P4SMA56A

P4SMA56CA

56A

56C

47.80 

53.20

58.80

1

77.0

5.3 

1

X

P4SMA62A

P4SMA62CA

62A

62C

53.00

58.90

65.10

1

85.0

4.8 

1

X

P4SMA68A

P4SMA68CA

68A

68C

58.10

64.60

71.40

1

92.0

4.5 

1

X

P4SMA75A

P4SMA75CA

75A

75C

64.10

71.30

78.80

1

103.0

4.0 

1

X

P4SMA82A

P4SMA82CA

82A

82C

70.10

77.90

86.10

1

113.0

3.6 

1

X

P4SMA91A

P4SMA91CA

91A

91C

77.80

86.50

95.50

1

125.0

3.3 

1

X

P4SMA100A P4SMA100CA

100A

100C

85.50

95.00

105.00

1

137.0

3.0 

1

X

P4SMA110A P4SMA110CA

110A

110C

94.00

105.00

116.00

1

152.0

2.7 

1

X

P4SMA120A P4SMA120CA

120A

120C

102.00

114.00

126.00

1

165.0

2.5 

1

X

P4SMA130A P4SMA130CA

130A

130C

111.00

124.00

137.00

1

179.0

2.3 

1

X

P4SMA150A P4SMA150CA

150A

150C

128.00

143.00

158.00

1

207.0

2.0 

1

X

P4SMA160A P4SMA160CA

160A

160C

136.00

152.00

168.00

1

219.0

1.9 

1

X

P4SMA170A P4SMA170CA

170A

170C

145.00

162.00

179.00

1

234.0

1.8 

1

X

P4SMA180A P4SMA180CA

180A

180C

154.00

171.00

189.00

1

246.0

1.7 

1

X

P4SMA200A P4SMA200CA

200A

200C

171.00

190.00

210.00

1

274.0

1.5 

1

X

P4SMA220A P4SMA220CA

220A

220C

185.00

209.00

231.00

1

328.0

1.3 

1

X

P4SMA250A P4SMA250CA

250A

250C

214.00

237.00

263.00

1

344.0

1.2 

1

X

P4SMA300A P4SMA300CA

300A

300C

256.00

285.00

315.00

1

414.0

1.0 

1

X

P4SMA350A P4SMA350CA

350A

350C

300.00

332.00

368.00

1

482.0

0.9 

1

X

P4SMA400A P4SMA400CA

400A

400C

342.00

380.00

420.00

1

548.0

0.8 

1

X

P4SMA440A P4SMA440CA

440A

440C

376.00

418.00

462.00

1

602.0

0.7 

1

X

P4SMA480A P4SMA480CA

480A

480C

408.00

456.00

504.00

1

658.0

0.6 

1

P4SMA510A P4SMA510CA

510A

510C

434.00

485.00

535.00

1

698.0

0.6 

1

P4SMA530A P4SMA530CA

530A

530C

477.00

503.50

556.50

1

725.0

0.6 

1

P4SMA540A P4SMA540CA

540A

540C

486.00

513.00

567.00

1

740.0

0.5 

1

P4SMA550A P4SMA550CA

550A

550C

495.00

522.50

577.50

1

760.0

0.5 

1

For bidirectional type having V

R

 of 10 volts and less, the I

R

 limit is double.

For parts without A , the V

BR

 is ± 10% and Vc is 5% higher than with A parts.

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

Surface Mount – 400W  >  P4SMA series

0.1

1

10

0.000001

0.00001

0.0001

0.001

t

d

-Pulse Width (sec.)

P

PPM

-Peak Pulse Power (kW)

0.2x0.2" (5.0x5.0mm)
Copper Pad Area

I-V Curve Characteristics

Ratings and Characteristic Curves 

(T

A

=25°C unless otherwise noted

Voltage Transients

Time

Voltage Across TVS

Current Through TVS

Voltage or Current

Figure 1 - TVS Transients Clamping Waveform

Figure 2 - Peak Pulse Power Rating Curve

Vc V

BR

V

R

I

R

I

T

I

pp

V

Uni-directional

V

F

Vc V

BR

V

R

I

R

I

T

I

pp

V

Vc

V

BR

V

R

I

pp

I

R

I

T

Bi-directional

P

PPM

 Peak Pulse Power Dissipation

 -- Max power dissipation 

V

R  

  

  

Stand-off Voltage

 -- Maximum voltage that can be applied to the TVS without operation

V

BR    

Breakdown Voltage

 -- Maximum current that flows though the TVS at a specified test current (I

T

)

V

C   

 

  

Clamping Voltage

 -- Peak voltage measured across the suppressor at a specified Ippm (peak impulse current)

I

R       

Reverse Leakage Current 

-- Current measured at V

R

V

F      

Forward Voltage Drop for Uni-directional

 

continues on next page.

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 

Revised: 09/13/13

Surface Mount – 400W  >  P4SMA series

I

PPM

- P

eak P

ulse Cur

rent, % 

I

RSM

0

0

50

100

150

1.0

2.0

3.0

4.0

tr=10µsec

Peak Value
IPPM

IPPM

2

TJ=25°C

Pulse Width(td) is defined
as the point where the peak 
current decays to 50% of IPPM

10/1000µsec. Waveform
as defined by R.E.A

td

t-Time (ms)

Half Value
IPPM

(   )

0

20

40

60

80

100

0

25

50

75

100

125

150

175

T

A

-Ambient temperature (ºC)

Peak Pulse Power (P

PP

) or Current (I

PP

)

Derating in Percentage 

%

1

10

100

1000

10000

1.0

10.0

100.0

1000.0

Cj

 (p

F)

Tj=25ºC
f=1.0MHz
Vsig=50mVp-p

Uni-directional V=0V

Bi-directional V=0V

V

BR

 - Reverse Breakdown Voltage (V)

Bi-directional @V

R

Uni-directional @V

R

0

25

50

75

100

125

150

175

P

M(A

V)

, Steady State Power Dissipation (W

)

T

A

 - Ambient Temperature (ºC)

bargaining 

 

3.0

0.6

1.2

1.8

3.6

2.4

0

Figure 3 - Pulse Derating Curve

Figure 4 - Pulse Waveform

Figure 5 - Typical Junction Capacitance

Figure 6 - Steady State Power Dissipation Derating Curve

0

5

10

15

20

25

30

35

40

45

1

10

100

I

FS

M

 - Peak Forward Surge Current (A)

Number of Cyles at 60 Hz

Figure 7 - Maximum Non-Repetitive Forward Surge 

Current Uni-Directional Only

Ratings and Characteristic Curves 

(T

A

=25°C unless otherwise noted)

 

(Continued)

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

Surface Mount – 400W  >  P4SMA series

Physical Specifications

Weight

0.002 ounce, 0.061 gram

Case

JEDEC DO-214AC. Molded plastic body 

over glass passivated junction

Polarity

 Color band denotes positive end 

(cathode) except bidirectional

Terminal

Matte Tin-plated leads, Solderable per 
JESD22-B102D

Dimensions

Soldering Parameters

Te

mperature (T

)

Time (t)

T

s(min)

T

s(max)

T

L

T

P

t

s

Preheat

t

L

t

p

Ramp-up

Critical Zone

T

L

 to T

P

Ramp-down

t 25˚C to Peak

25˚C

Reflow Condition

Lead–free assembly

Pre Heat

- Temperature Min (T

s(min)

)

150°C 

- Temperature Max (T

s(max)

)

200°C

- Time (min to max) (t

s

)

60 – 180 secs

Average ramp up rate (Liquidus Temp 
(T

L

) to peak

3°C/second max

T

S(max)

  to T

L

 - Ramp-up Rate

3°C/second max

Reflow

- Temperature  (T

L

) (Liquidus)

217°C 

- Time (min to max) (t

s

)

60 – 150 seconds

Peak Temperature  (T

P

)

260

+0/-5

 °C

Time within 5°C of actual peak 
Temperature (t

p

)

20 – 40 seconds

Ramp-down Rate

6°C/second max

Time 25°C to peak Temperature (T

P

)

8 minutes Max.

Do not exceed

280°C

Dimensions

Inches

Millimeters

Min

Max

Min

Max

A

0.049

0.065

1.250

1.650

B

0.157

0.177

3.990

4.500

C

0.100

0.110

2.540

2.790

D

0.078

0.090

1.980

2.290

E

0.030

0.060

0.780

1.520

F

-

0.008

-

0.203

G

0.194

0.208

4.930

5.280

H

0.006

0.012

0.152

0.305

I

0.070

-

1.800

-

J

0.082

-

2.100

-

K

-

0.090

-

2.300

L

0.082

-

2.100

-

DO-214AC (SMA)

P4SMAJ

 

Cathode Band

A

D

E

G

F

H

C

B

(for uni-directional products only)

(all dimensions in mm)

I

L

K

J

Solder Pads

Environmental Specifications

High Temp.  Storage

JESD22-A103

HTRB

JESD22-A108

Thermal Shock

JESD22-A106

MSL

JEDEC-J-STD-020C, Level 1

H3TRB

JESD22-A101

RSH

JESD22-B106C

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 

Revised: 09/13/13

Surface Mount – 400W  >  P4SMA series

Part Numbering System

V

BR 

VOLTAGE

BI-DIRECTIONAL

5% V

BR 

VOLTAGE TOLERANCE

SERIES

P4SMA XXX C A

Packaging

Part number

Component Package 

Quantity

Packaging Option

Packaging Specification

P4SMA

xxxXX

DO-214AC

5000

Tape & Reel – 12mm/13” tape

EIA STD RS-481

Part Marking System

Tape and Reel Specification 

0.47

(12.0)

0.157

(4.0)

0.157

(4.0)

0.49

(12.5)

0.80 (20.2) 

Arbor Hole Dia.

13.0 (330) 

Dimensions are in inches
(and millimeters).

Direction of Feed

0.059 DIA

(1.5)

Cover tape

Cathode

F

XX

YMXXX

Marking Code

Trace Code Marking

  Y:Year Code
  M: Month Code
  XXX: Lot Code

Littelfuse Logo

Cathode Band

(for uni-directional products only)

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

Surface Mount – 600W  >  SMA6J series

Description

Features

Maximum Ratings and Thermal Characteristics 
(T

A

=25°C unless otherwise noted)

Parameter

Symbol

Value

Unit

Peak Pulse Power Dissipation at 

T

A

=25ºC by 10/1000µs Waveform 

(Fig.2)(Note 1), (Note 2) 

P

PPM

600

W

Power Dissipation on Infinite Heat 

Sink at T

A

=50°C

P

M(AV)

3.3

W

Peak Forward Surge Current, 8.3ms 

Single Half Sine Wave (Note 3)

I

FSM

60

A

Maximum Instantaneous Forward 

Voltage at 25A for Unidirectional  

Only (Note 4)

V

F

3.5V/6.5

V

Operating Junction and Storage 

Temperature Range

T

J

, T

STG

-55 to 150

°C

Typical Thermal Resistance Junction 

to Lead

R

uJL

30

°C/W

Typical Thermal Resistance Junction 

to Ambient

R

uJA

120

°C/W

Notes:

1.  Non-repetitive current pulse, per Fig.4 and derated above T

A

=25ºC per Fig. 3.

2. Mounted on 5.0x5.0mm copper pad to each terminal.
3. Measured on 8.3ms single half sine wave or equivalent square wave for unidirectional

 

device only.

4. V

F

 < 3.5V for V

BR

 _

< 

200V and V

F

< 6.5V for V

BR  

_

>

 201V.

The SMA6J series is designed specifically to protect 

sensitive electronic equipment from voltage transients 
induced by lightning and other transient voltage events.

Applications

TVS devices are ideal for the protection of I/O Interfaces, 
V

CC

 bus and other vulnerable circuits used in Telecom, 

Computer, Industrial and Consumer electronic applications.

•  For surface mounted 

applications to optimize 
board space

• Low profile package
•  Typical failure mode is 

short from over-specified 
voltage or current 

•  Whisker test is conducted 

based on JEDEC 
JESD201A per its table 4a 
and 4c

•  IEC-61000-4-2 ESD 

15kV(Air), 8kV (Contact)

•  ESD protection of data 

lines in accordance with 

IEC 61000-4-2 (IEC801-2)

•  EFT protection of data 

lines in accordance with 

IEC 61000-4-4 (IEC801-4)

• Built-in strain relief
• Glass passivated junction
• Low inductance
•  Excellent clamping 

capability

•  600W peak pulsepower 

capability at 10/1000µs 
waveform, repetition rate 

(duty cycle): 0.01%

•  Fast response time: 

typically less than 1.0ps 
from 0 Volts to V

BR

 min

•  Typical I

R

 less than 1µA 

above 12V

•  High temperature 

soldering: 260°C/40 

seconds at terminals

•  

V

BR

 @T

J

= V

BR

@25°C × (1+

α

T

   x (T

J

 - 25))

   (

α

T: Temperature Coefficient) 

•  Plastic package has 

underwriters laboratory 

flammability 94V-O

•  Meet MSL level1, per
   J-STD-020, LF maximum
   peak of 260°C
•  Matte tin lead–free plated
• Halogen free and RoHS 

compliant

SMA6J Series

Uni-directional

Functional Diagram

Bi-directional 

Uni-directional 

Cathode 

Anode

RoHS

Agency Approvals

AGENCY

AGENCY FILE NUMBER

E230531

Additional Information

Datasheet

Samples

Resources

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 

Revised: 09/13/13

Surface Mount – 600W  >  SMA6J series

I-V Curve Characteristics

Voltage Transients

Time

Voltage Across TVS

Current Through TVS

Voltage or Current

Figure 1 - TVS Transients Clamping Waveform

Ratings and Characteristic Curves 

(T

A

=25°C unless otherwise noted)

0.1

1

10

0.000001

0.00001

0.0001

0.001

t

d

-Pulse Width (sec.)

P

PPM

-Peak Pulse Power (kW)

0.2x0.2" (5.0x5.0mm)
Copper Pad Area

Figure 2 - Peak Pulse Power Rating Curve

Vc V

BR

V

R

I

R

I

T

I

pp

V

Uni-directional

V

F

P

PPM

 Peak Pulse Power Dissipation

 -- Max power dissipation 

V

R  

  

  

Stand-off Voltage

 -- Maximum voltage that can be applied to the TVS without operation

V

BR    

Breakdown Voltage

 -- Maximum current that flows though the TVS at a specified test current (I

T

)

V

C   

 

  

Clamping Voltage

 -- Peak voltage measured across the suppressor at a specified Ippm (peak impulse current)

I

R       

Reverse Leakage Current 

-- Current measured at V

R

V

F      

Forward Voltage Drop for Uni-directional

 

continues on next page.

Electrical Characteristics

.

(T

A

=25°C unless otherwise noted)

Part  

Number 

(Uni)

Marking

Reverse Stand 

off Voltage V

R

 

(Volts)

Breakdown 

Voltage V

BR

 (Volts) @ I

T

Test 

Current

I

T

 

(mA)

Maximum 

Clamping 

Voltage 

V

C

 @ I

pp

 

(V)

Maximum 

Peak Pulse 

Current I

pp

 

(A)

Maximum 

Reverse 

Leakage 

I

R

 @ V

R

(µA)

UNI

MIN

MAX

SMA6J5.0A

6BA

5.0

6.40

7.00

10

9.2

65.3

800

SMA6J12A

6BE

12.0

13.30 

14.70 

1

19.9

30.2

1.0

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

Surface Mount – 600W  >  SMA6J series

0

20

40

60

80

100

0

25

50

75

100

125

150

175

T

A

-Ambient temperature (ºC)

Peak Pulse Power (P

PP

) or Current (I

PP

)

Derating in Percentage 

%

1

10

100

1000

10000

1.0

10.0

100.0

1000.0

Cj

 (p

F)

Tj=25ºC
f=1.0MHz
Vsig=50mVp-p

Uni-directional V=0V

Uni-directional @

V

R

V

BR

 - Reverse Breakdown Voltage (V)

Figure 3 - Pulse Derating Curve

I

PPM

- P

eak P

ulse Cur

rent, % 

I

RSM

0

0

50

100

150

1.0

2.0

3.0

4.0

tr=10µsec

Peak Value
IPPM

IPPM

2

TJ=25°C

Pulse Width(td) is defined
as the point where the peak 
current decays to 50% of IPPM

10/1000µsec. Waveform
as defined by R.E.A

td

t-Time (ms)

Half Value
IPPM

(   )

Figure 4 - Pulse Waveform

Figure 5 - Typical Junction Capacitance

0

25

50

75

100

125

150

175

P

M(A

V)

, Steady State Power Dissipation (W

)

T

A

 - Ambient Temperature (ºC)

bargaining 

 

3.0

0.6

1.2

1.8

3.6

2.4

0

Figure 6 - Steady State Power Dissipation Derating 

Curve

0

5

10

15

20

25

30

35

40

45

1

10

100

Number of Cycles at 60 Hz

I

FSM

 - Peak Forward Surve Current

(A)

Figure 7 - Maximum Non-Repetitive Forward Surge 

Current Uni-Directional Only

Ratings and Characteristic Curves 

(T

A

=25°C unless otherwise noted)

 

(Continued)

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 

Revised: 09/13/13

Surface Mount – 600W  >  SMA6J series

Dimensions

Physical Specifications

Weight

0.002 ounce, 0.061 gram

Case

JEDEC DO-214AC Molded Plastic over 

glass passivated junction

Polarity

 Color band denotes cathode except Bipolar

Terminal

Matte Tin-plated leads, Solderable per 
JESD22-B102D

Dimensions

Inches

Millimeters

Min

Max

Min

Max

A

0.049

0.065

1.250

1.650

B

0.157

0.177

3.990

4.500

C

0.100

0.110

2.540

2.790

D

0.078

0.090

1.980

2.290

E

0.030

0.060

0.780

1.520

F

-

0.008

-

0.203

G

0.194

0.208

4.930

5.280

H

0.006

0.012

0.152

0.305

I

0.070

-

1.800

-

J

0.082

-

2.100

-

K

-

0.090

-

2.300

L

0.082

-

2.100

-

Soldering Parameters

Te

mperature (T

)

Time (t)

T

s(min)

T

s(max)

T

L

T

P

t

s

Preheat

t

L

t

p

Ramp-up

Critical Zone

T

L

 to T

P

Ramp-down

t 25˚C to Peak

25˚C

Reflow Condition

Lead–free assembly

Pre Heat

- Temperature Min (T

s(min)

)

150°C 

- Temperature Max (T

s(max)

)

200°C

- Time (min to max) (t

s

)

60 – 180 secs

Average ramp up rate (Liquidus Temp 
(T

L

) to peak

3°C/second max

T

S(max)

  to T

L

 - Ramp-up Rate

3°C/second max

Reflow

- Temperature  (T

L

) (Liquidus)

217°C 

- Time (min to max) (t

s

)

60 – 150 seconds

Peak Temperature  (T

P

)

260

+0/-5

 °C

Time within 5°C of actual peak 
Temperature (t

p

)

20 – 40 seconds

Ramp-down Rate

6°C/second max

Time 25°C to peak Temperature (T

P

)

8 minutes Max.

Do not exceed

280°C

DO-214AC (SMA)

Cathode Band

A

D

E

G

F

H

C

B

(all dimensions in mm)

I

L

K

J

Solder Pads

Environmental Specifications

High Temp.  Storage

JESD22-A103

HTRB

JESD22-A108

Thermal Shock

JESD22-A106

MSL

JEDEC-J-STD-020C, Level 1

H3TRB

JESD22-A101

RSH

JESD22-B106C

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

Surface Mount – 600W  >  SMA6J series

Part Numbering System

Part Marking System

Packaging

Part number

Component Package 

Quantity

Packaging Option

Packaging Specification

SMA6JxxX

DO-214AC

5000

Tape & Reel – 12mm/13” tape

EIA RS-481

SMA6J   xx    A

SERIES

5%

 V

BR 

VOLTAGE TOLERANCE

 V

R 

VOLTAGE

F

XX

YMXXX

Marking Code

Trace Code Marking

  Y:Year Code
  M: Month Code
  XXX: Lot Code

Littelfuse Logo

Cathode Band

(for uni-directional products only)

Cathode

Tape and Reel Specification 

0.47

(12.0)

0.157

(4.0)

0.157

(4.0)

0.49

(12.5)

0.80 (20.2) 

Arbor Hole Dia.

13.0 (330) 

Dimensions are in inches
(and millimeters).

Direction of Feed

0.059 DIA

(1.5)

Cover tape

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

Surface Mount – 600W  >  SMA6L series

Description

Features

Maximum Ratings and Thermal Characteristics 
(T

A

=25°C unless otherwise noted)

Parameter

Symbol

Value

Unit

Peak Pulse Power Dissipation at 

T

A

=25ºC by 10/1000µs Waveform 

(Fig.2)(Note 1), (Note 2) 

P

PPM

600

W

Power Dissipation on Infinite Heat 

Sink at T

A

=50°C

P

M(AV)

3

W

Peak Forward Surge Current, 8.3ms 

Single Half Sine Wave (Note 3)

I

FSM

60

A

Maximum Instantaneous Forward 

Voltage at 25A for Unidirectional  

Only 

V

F

3.5V

V

Operating Junction and Storage 

Temperature Range

T

J

, T

STG

-55 to 150

°C

Typical Thermal Resistance Junction 

to Lead

R

uJL

35

°C/W

Typical Thermal Resistance Junction 

to Ambient

R

uJA

200

°C/W

Notes:

1.  Non-repetitive current pulse, per Fig.4 and derated above T

A

=25ºC per Fig. 3.

2. Mounted on 5.0x5.0mm copper pad to each terminal.
3. Measured on 8.3ms single half sine wave or equivalent square wave for unidirectional

 

device only.

The SMA6L series is designed specifically to protect 

sensitive electronic equipment from voltage transients 
induced by lightning and other transient voltage events.

SMA low profile package has the same electronical 
performance as the SMB package but with low height 
profiles (1.1mm) in the industry.

Applications

TVS devices are ideal for the protection of I/O Interfaces, 
V

CC

 bus and other vulnerable circuits used in Telecom, 

Computer, Industrial and Consumer electronic applications.

•  SMA low profile package: 

less than 1.1 mm

•  Same power as standard 

SMB devices (600 W)

•  Footprint compatibility 

with standard SMA and 
SMB products (easy to 
layout)

•  Typical failure mode is 

short from over-specified 
voltage or current 

•  Whisker test is conducted 

based on JEDEC 
JESD201A per its table 4a 
and 4c

•  IEC-61000-4-2 ESD 

15kV(Air), 8kV (Contact)

•  ESD protection of data 

lines in accordance with 

IEC 61000-4-2 (IEC801-2)

•  EFT protection of data 

lines in accordance with 

IEC 61000-4-4 (IEC801-4)

• Low inductance, excellent 

clamping capability

•  Fast response time: 

typically less than 1.0ns 
from 0 Volts to V

BR

 min

• Built-in strain relief
• Glass passivated junction
•  Typical I

R

 less than 1µA 

above 12V

•  High temperature 

soldering: 260°C/40 

seconds at terminals

•  

V

BR

 @T

J

= V

BR

@25°C × (1+

α

T

   x (T

J

 - 25))

   (

α

T: Temperature Coefficient) 

•  Meet MSL level1, per
   J-STD-020, LF maximum
   peak of 260°C
•  Matte tin lead–free plated
• Halogen free and RoHS 

compliant

RoHS

SMA6L Series

Functional Diagram

Bi-directional 

Uni-directional 

Cathode 

Anode

Uni-directional

Additional Information

Datasheet

Samples

Resources

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 

Revised: 09/13/13

Surface Mount – 600W  >  SMA6L series

Electrical Characteristics

.

(T

A

=25°C unless otherwise noted)

Part  

Number 

(Uni)

Marking

Reverse 

Stand off 

Voltage V

R

 

(Volts)

Breakdown 

Voltage V

BR

 (Volts) @ I

T

Test 

Current

I

T

 

(mA)

Maximum 

Clamping Voltage 

V

C

  

@ I

pp

 

(V)

Maximum Peak 

Pulse Current 

I

pp

 (A)

Maximum 

Reverse Leakage 

I

R

 @ V

R

(µA)

UNI

MIN

MAX

 SMA6L5.0A

AE

5.0

6.40 

7.00 

10

9.2

65.3

800

 SMA6L6.0A

AG

6.0

6.67 

7.37 

10

10.3

58.3

800

 SMA6L6.5A

AK

6.5

7.22 

7.98 

10

11.2

53.6

500

 SMA6L7.0A

AM

7.0

7.78 

8.60 

10

12.0

50.0

200

 SMA6L7.5A

AP

7.5

8.33 

9.21 

1

12.9

46.6

100

 SMA6L8.0A

AR

8.0

8.89 

9.83 

1

13.6

44.2

50

 SMA6L8.5A

AT

8.5

9.44 

10.40 

1

14.4

41.7

20

 SMA6L9.0A

AV

9.0

10.00 

11.10 

1

15.4

39.0

10

SMA6L10A

AX

10.0

11.10 

12.30 

1

17.0

35.3

5

SMA6L11A

AZ

11.0

12.20 

13.50 

1

18.2

33.0

1

SMA6L12A

BE

12.0

13.30 

14.70 

1

19.9

30.2

1

SMA6L13A

BG

13.0

14.40 

15.90 

1

21.5

28.0

1

SMA6L14A

BK

14.0

15.60 

17.20 

1

23.2

25.9

1

SMA6L15A

BM

15.0

16.70 

18.50 

1

24.4

24.6

1

SMA6L16A

BP

16.0

17.80

19.70

1

26.0

23.1

1

SMA6L17A

BR

17.0

18.90

20.90

1

27.6

21.8

1

SMA6L18A

BT

18.0

20.00

22.10

1

29.2

20.6

1

SMA6L20A

BV

20.0

22.20

24.50

1

32.4

18.6

1

SMA6L22A

BX

22.0

24.40

26.90

1

35.5

16.9

1

SMA6L24A

BZ

24.0

26.70

29.50

1

38.9

15.5

1

SMA6L26A

CE

26.0

28.90

31.90

1

42.1

14.3

1

SMA6L28A

CG

28.0

31.10

34.40

1

45.4

13.3

1

 SMA6L30A

CK

30.0

33.30

36.80

1

48.4

12.4

1

SMA6L33A

CM

33.0

36.70

40.60

1

53.3

11.3

1

SMA6L36A

CP

36.0

40.00

44.20

1

58.1

10.4

1

SMA6L40A

CR

40.0

44.40

49.10

1

64.5

9.3

1

SMA6L43A

CT

43.0

47.80

52.80

1

69.4

8.7

1

SMA6L45A

CV

45.0

50.00

55.30

1

72.7

8.3

1

SMA6L48A

CX

48.0

53.30

58.90

1

77.4

7.8

1

SMA6L51A

CZ

51.0

56.70

62.70

1

82.4

7.3

1

SMA6L54A

RE

54.0

60.00

66.30

1

87.1

6.9

1

SMA6L58A

RG

58.0

64.40

71.20

1

93.6

6.5

1

SMA6L60A

RK

60.0

66.70

73.70

1

96.8

6.2

1

SMA6L64A

RM

64.0

71.10

78.60

1

103.0

5.9

1

SMA6L70A

RP

70.0

77.80

86.00

1

113.0

5.3

1

SMA6L75A

RR

75.0

83.30

92.10

1

121.0

5.0

1

SMA6L78A

RT

78.0

86.70

95.80

1

126.0

4.8

1

SMA6L85A

RV

85.0

94.40

104.00

1

137.0

4.4

1

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

Surface Mount – 600W  >  SMA6L series

I-V Curve Characteristics

Vc V

BR

V

R

I

R

I

T

I

pp

V

Uni-directional

V

F

P

PPM

 Peak Pulse Power Dissipation

 -- Max power dissipation 

V

R  

  

  

Stand-off Voltage

 -- Maximum voltage that can be applied to the TVS without operation

V

BR    

Breakdown Voltage

 -- Maximum current that flows though the TVS at a specified test current (I

T

)

V

C   

 

  

Clamping Voltage

 -- Peak voltage measured across the suppressor at a specified Ippm (peak impulse current)

I

R       

Reverse Leakage Current 

-- Current measured at V

R

V

F      

Forward Voltage Drop for Uni-directional

 

0.1

1

10

100

0.000001

0.00001

0.0001

0.001

t

d

-Pulse Width (sec.)

0.2x0.2" (5.0x5.0mm)

Copper Pad Area

P

PPM

-Peak Pulse Power (kW

)

Figure 2 - Peak Pulse Power Rating Curve

Voltage Transients

Time

Voltage Across TVS

Current Through TVS

Voltage or Current

Figure 1 - TVS Transients Clamping Waveform

Ratings and Characteristic Curves 

(T

A

=25°C unless otherwise noted)

 

continues on next page.

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 

Revised: 09/13/13

Surface Mount – 600W  >  SMA6L series

0

20

40

60

80

100

0

25

50

75

100

125

150

175

T

A

-Ambient temperature (ºC)

Peak Pulse Power (P

PP

) or Current (I

PP

)

Derating in Percentage 

%

1

10

100

1000

10000

1.0

10.0

100.0

1000.0

Cj

 (p

F)

Tj=25ºC
f=1.0MHz
Vsig=50mVp-p

Uni-directional V=0V

Uni-directional @

V

R

V

BR

 - Reverse Breakdown Voltage (V)

Figure 3 - Pulse Derating Curve

I

PPM

- P

eak P

ulse Cur

rent, % 

I

RSM

0

0

50

100

150

1.0

2.0

3.0

4.0

tr=10µsec

Peak Value
IPPM

IPPM

2

TJ=25°C

Pulse Width(td) is defined
as the point where the peak 
current decays to 50% of IPPM

10/1000µsec. Waveform
as defined by R.E.A

td

t-Time (ms)

Half Value
IPPM

(   )

Figure 4 - Pulse Waveform

Figure 5 - Typical Junction Capacitance

0

25

50

75

100

125

150

175

P

M(A

V)

, Steady State Power Dissipation (W

)

T

A

 - Ambient Temperature (ºC)

bargaining 

 

3.0

0.6

1.2

1.8

3.6

2.4

0

RuJA=RuJL

RuJA=200°C/W

Figure 6 - Steady State Power Dissipation Derating 

Curve

Ratings and Characteristic Curves 

(T

A

=25°C unless otherwise noted)

 

(Continued)

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

Surface Mount – 600W  >  SMA6L series

Dimensions

Physical Specifications

Weight

0.002 ounce, 0.061 gram

Case

JEDEC DO-221AC Molded Plastic over 

glass passivated junction

Polarity

 Color band denotes cathode except Bipolar

Terminal

Matte Tin-plated leads, Solderable per 
JESD22-B102D

Dimensions

Inches

Millimeters

Min

Max

Min

Max

A

0.156

0.181

3.950

4.600

B

0.189

0.220

4.800

5.600

C

0.049

0.069

1.250

1.750

D

0.088

0.116

2.250

2.950

E

0.030

0.059

0.750

1.500

F

0.005

0.010

0.125

0.250

G

0.035

0.043

0.900

1.100

Soldering Parameters

Te

mperature (T

)

Time (t)

T

s(min)

T

s(max)

T

L

T

P

t

s

Preheat

t

L

t

p

Ramp-up

Critical Zone

T

L

 to T

P

Ramp-down

t 25˚C to Peak

25˚C

Reflow Condition

Lead–free assembly

Pre Heat

- Temperature Min (T

s(min)

)

150°C 

- Temperature Max (T

s(max)

)

200°C

- Time (min to max) (t

s

)

60 – 180 secs

Average ramp up rate (Liquidus Temp 
(T

L

) to peak

3°C/second max

T

S(max)

  to T

L

 - Ramp-up Rate

3°C/second max

Reflow

- Temperature  (T

L

) (Liquidus)

217°C 

- Time (min to max) (t

s

)

60 – 150 seconds

Peak Temperature  (T

P

)

260

+0/-5

 °C

Time within 5°C of actual peak 
Temperature (t

p

)

20 – 40 seconds

Ramp-down Rate

6°C/second max

Time 25°C to peak Temperature (T

P

)

8 minutes Max.

Do not exceed

280°C

D

3.12 (0.123)

1 .20 (0.047)

1.52 (0.060)

Mounting Pad Layout

A

B

E

E

C

G

F

Cathode Band

Environmental Specifications

High Temp.  Storage

JESD22-A103

HTRB

JESD22-A108

Thermal Shock

JESD22-A106

MSL

JEDEC-J-STD-020C, Level 1

H3TRB

JESD22-A101

RSH

JESD22-B106C

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 

Revised: 09/13/13

Surface Mount – 600W  >  SMA6L series

Part Numbering System

Part Marking System

Packaging

Part number

Component Package 

Quantity

Packaging Option

Packaging Specification

SMA6LxxA

DO-221AC

3000

Tape & Reel – 12mm/7” tape

EIA RS-481

SMA6L   xx    A

SERIES

5%

 V

BR 

VOLTAGE TOLERANCE

 V

R 

VOLTAGE

F

XX

YMXXX

Marking Code

Trace Code Marking

  Y:Year Code
  M: Month Code
  XXX: Lot Code

Littelfuse Logo

Cathode Band

(for uni-directional products only)

Tape and Reel Specification 

0.47

(12.0)

0.157

(4.0)

0.157

(4.0)

0.49

(12.5)

0.80 (20.2) 

Arbor Hole Dia.

7.0 (178) 

Dimensions are in inches
(and millimeters).

Direction of Feed

0.059 DIA

(1.5)

Cover tape

Cathode

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 
Revised: 09/13/13

Surface Mount – 500W  >  SACB series

SACB series is designed specifically to protect sensitive 
electronic equipment from voltage transients induced by 
lightning and other transient voltage events.

Description

TVS devices are ideal for the protection of I/O Interfaces, 
V

CC

 bus and other vulnerable circuits used in Telecom, 

Computer, Industrial and Consumer electronic applications.

Applications

Features

Maximum Ratings and Thermal Characteristics 
(T

A

=25°C unless otherwise noted)

• For surface mounted 

applications in order to 
optimize board space

• Low profile package
• Built-in strain relief
•  Typical failure mode is 

short from over-specified 
voltage or current 

•  Whisker test is conducted 

based on JEDEC 
JESD201A per its table 4a 
and 4c

•  IEC-61000-4-2 ESD 

15kV(Air), 8kV (Contact)

•  ESD protection of data 

lines in accordance with 

IEC 61000-4-2 (IEC801-2)

•  EFT protection of data 

lines in accordance with 

IEC 61000-4-4 (IEC801-4)

• 

V

BR

 @T

J

= V

BR

@25°C × (1+

α

T

   x (T

J

 - 25))

   (

α

T: Temperature Coefficient)

• Glass passivated chip 

junction

•  500W peak pulse power 

capability at 10/1000μs 
waveform, repetition rate 

(duty cycles):0.01%

•  Fast response time: 

typically less than 1.0ps 
from 0V to BV min

•  Excellent clamping 

capability

•  Low incremental surge 

resistance

•  High temperature 

soldering guaranteed: 
260°C/40 seconds at 

terminals

•  Plastic package has 

underwriters laboratory 

flammability 94V-O

•  Meet MSL level1, per
   J-STD-020, LF maximum
   peak of 260°C
•  Matte tin lead–free plated
• Halogen free and RoHS 

compliant

Parameter

Symbol

Value

Unit

Peak Pulse Power Dissipation at 

ta=25°C by 10/1000μs Waveform 

(fig.1)( Note 1)

P

PPM

500

W

Power Dissipation on Infinite Heat 

Sink at T

L

=50ºC

P

M(AV)

3.0

W

Peak Pulse Power Dissipation at 

Ta=25ºC by 10/1000μs Waveform 

(Fig. 3) (Note 1)

I

PPM

See 

Table 1

Amps

Operating Junction and Storage 

Temperature Range

T

J

, T

STG

-55 to 150

°C

Typical Thermal Resistance Junction 

to Lead

R

uJL

30

°C/W

Typical Thermal Resistance Junction 

to Ambient

R

uJA

120

°C/W

Note:

1. Non-repetitive current pulse , per Fig. 3 and derated above T

A

 = 25°C per Fig. 2.

Agency Approvals

AGENCY

AGENCY FILE NUMBER

E230531

RoHS

SACB Series

Uni-directional

Additional Information

Datasheet

Samples

Resources

Transient Voltage Suppression Diodes

© 2013 Littelfuse, Inc.

Specifications are subject to change without notice. 

Revised: 09/13/13

Surface Mount – 500W  >  SACB series

Electrical Characteristics

.

(T

A

=25°C unless otherwise noted)

Part  

Number

Marking 

Code

Stand-Off 

Voltage 

(Note1) V

R

(V)

Minimum 

Breakdown 

Voltage at 

I

T

 =1.0MA 

V

BR

(V)

Maximum 

Reverse 

Leakage 

at V

R

 I

R

 

A)

Maximum 

Clamping 

Voltage at 

I

PP

=5.0A 

V

C

(V)

Maximum 

Peak 

Pulse 

Current 

per (Fig.3) 

I

PP

(A)

Maximum 

Junction 

Capacitance 

at 

0 Volts (pF)

Working 

Inverse 

Blocking 

Voltage 

V

WIB

(V)

Inverse 

Blocking 

Leakage 

Current at 

V

WIB

@ I

IB 

(mA)

Peak Inverse 

Blocking 

Voltage V

PIB

 

(V)

UL 

Recognition

SACB5.0

SKE

5.0

7.60

300

10.0

44.0

45

75

1.0

100

X

SACB6.0

SKG

6.0

7.90

300

11.2

41.0

45

75

1.0

100

X

SACB7.0

SKM

7.0

8.33

300

12.6

38.0

45

75

1.0

100

X

SACB8.0

SKR

8.0

8.89

100

13.4

36.0

45

75

1.0

100

X

SACB8.5

SKT

8.5

9.44

50

14.0

34.0

45

75

1.0

100

X

SACB10

SKX

10.0

11.10

5

16.3

29.0

45

75

1.0

100

X

SACB12

SLE

12.0

13.30

5

19.0

25.0

45

75

1.0

100

X

SACB15

SLM

15.0

16.70

5

23.6

20.0

45

75

1.0

100

X

SACB18

SLT

18.0

20.00

5

28.8

15.0

45

75

1.0

100

X

SACB22

SLX

22.0

24.40

5

35.4

14.0

45

75

1.0

100

X

SACB26

SME

26.0

28.90

5

42.3

11.1

45

75

1.0

100

X

SACB30

SMK

30.0

33.30

5

48.6

10.0

45

75

1.0

100

X

SACB36

SMP

36.0

40.00

5

60.0

8.6

45

75

1.0

100

X

SACB45

SMV

45.0

50.00

5

77.0

6.8

45

150

1.0

200

X

SACB50

SMZ

50.0

55.50

5

88.0

5.8

45

150

1.0

200

X

Ratings and Characteristic Curves 

(T

A

=25°C unless otherwise noted

Low Capacitance

Application Note: 

Device must be used with two

units in parallel, opposite in polarity as shown in

circuit for AC signal line protection.

Figure 4 - AC Line Protection Application

0.1

1

10

100

0.1µs

1.0µs

10µs

100µs

1.0ms

10ms

I

PPM

- Peak

 Pulse Power (kW)

 

t

d

 - Pulse Width (sec.)

Non-repetitive Pulse 

Waveform shown in Fig. 3 

TA =25°C

30

Current Waveforms

Square

P

PK

td=7tp

td

td

P

PK

Half Sine

Impulse

td

P

PK

".5"

Exponential

Decay

SACB:  Revised Figure 1 - Peak Pulse Power Rating Curve

Ratings and Characteristic Curves 

(T

A

= 25°C unless otherwise noted)

I

PPM

- P

eak P

ulse Cur

rent, % 

I

RSM

0

0

50

100

150

1.0

2.0

3.0

4.0

tr=10µsec

Peak Value
IPPM

IPPM

2

TJ=25°C

Pulse Width(td) is defined
as the point where the peak 
current decays to 50% of IPPM

10/1000µsec. Waveform
as defined by R.E.A

td

t-Time (ms)

Half Value
IPPM

(   )

0

25

50

75

100

0

25

50

75

100

125

150

Percentage of Rated Power (%)

Average Power

Peak Power

(Single Pulse)

T

L

 - Lead Temperature (ºC)

Figure 1 - Peak Pulse Power Rating Curve

Figure 2 - Pulse Derating Curve

Figure 3 - Pulse Waveform