Diotec Semiconductor AG

  

79423 Heitersheim 

Tel.: +49-7634-5266-0  

mail@diotec.com 

Kreuzmattenstr. 4 

Germany 

Fax: +49-7634-5266-61 

www.diotec.com

 

Version 2005-11-03 

Diotec

 Products  

 for 

Telecommunication  

 
Typical Applications:  
Handsets, Mobile Chargers, Modems, Interfaces, Power Supplies, 
Equipment and Line Cards 
 
 

 
 
 
 
 
 
 
 
 

 
 

 

 

Handsets 

Î

 SMD 

Schottky 

Diodes

 

 

Mobile Chargers 

Î

 Bridge 

Rectifiers: 

 

  

MiniDIL, 

MicroDIL 

 

 

DC/DC-Converter 

Î

 Schottky 

Diodes, 

Superfast-/ 

  

 

Ultrafast-Rectifiers

 

 

Protection 

Î

 

TVS-Diodes, SDA2/4AK (Low Cj), 

 

 

(Fast) Bridge Rectifiers

 

 

Voltage Regulation 

Î

 Zener 

Diodes 

 

OR-ing Diodes 

Î

 Schottky 

Diodes, 

Standard 

  

 

Rectifiers

 

 

 

 

 
 

 

 
Diotec Products for 

Telecommunication

 

www.diotec.com

 11/2005 

 

 
Handsets, Mobile Phones 

 

Schottky

 Diodes for Polarity Protection

 

Connected between the battery of the mobile phone (or any other portable device) and the contacts to 
the external charger. They protect the battery of unwanted reverse current if contacts are short cut and 
also against charging with wrong polarity. Low forward voltage drop of a Schottky rectifier leads to 
small power losses during charging. The SGL34 and SGL1 in the MiniMELF package use minimal 
space on a PCB. 

 

Types

1

 

SMD:

  

SGL34-20…100,

 SGL1-20…100, SMS120…1100, SMS220…2100, SMS320…3100; 

SK12…110, SK32SMA…310SMA, SK52…510, SK82…810;

 

(0.5 to 8 A!) 

 
 
 
 
 
 
 
 

                                                

1

 

Preferred types are 

bold

; colours according to Diotec Selection Guide

 

 

 

 
 

 

 
Diotec Products for 

Telecommunication

 

www.diotec.com

 11/2005 

 

Mobile Chargers / DC-DC Converters

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Overvoltage Protection: 

TVS-Diodes

/

Zenerdiodes

1

 

 

TGL34-… , TGL41-…, P4SMA…,  P6SMB…, 1.5SMC…;

 (150 bis 1500 W peak; 

up to 550 V!

) 

ZMM…,

 

ZMD…

, ZMY..., 

SMZ1...,

 

SZ3C…, Z1SMA…, Z2SMB…, Z3SMC…;

 (0.5 bis 3 W continous) 

 
 

Input Rectification: 

Bridge Rectifiers

1

 

 
0.5 to 2 A 
SMD: 

MYS40…380, MS40…500,

 

S40…500, B40…500S

, 

B

B

4

4

0

0

…

…

3

3

8

8

0

0

F

F

S

S

 

 

(

(

F

F

a

a

s

s

t

t

)

)

,

,

 

CS10…50S (Schottky)

 

trough hole: 

B40…500D

,  

B

B

4

4

0

0

…

…

3

3

8

8

0

0

F

F

D

D

 

 

(

(

F

F

a

a

s

s

t

t

 

 

r

r

e

e

c

c

o

o

v

v

e

e

r

r

y

y

)

)

,

,

 

CS10…50D (Schottky),

 B40…500R (round)

 

 
 

Clamping Network: 

TVS-/

F

F

a

a

s

s

t

t

-Diode

1

 

 

TGL34-…

 , 

TGL41-…,

 

P4SMAJ…,  P6SMBJ…, 1.5SMCJ…;

 (150 bis 1500 W peak; 

up to 550 V!

) 

R

R

G

G

L

L

3

3

4

4

…

…

,

,

 

 

R

R

G

G

L

L

1

1

…

…

,

,

 

 

S

S

A

A

1

1

5

5

4

4

…

…

1

1

6

6

0

0

,

,

 

 

F

F

R

R

1

1

…

…

,

,

 

 

F

F

R

R

2

2

…

…

,

,

 

 

F

F

R

R

3

3

…

…

;

;

 

 

(

(

0

0

.

.

5

5

 

 

t

t

o

o

 

 

3

3

 

 

A

A

)

)

 

 

 
 

Output Rectification: 

Schottky

 Diodes

1

 

 

SGL34-20…100, SGL1-20…100, SMS120…1100, SMS220…2100, SMS320…3100; 

SK12…110, SK32SMA…310SMA, SK52…510, SK82…810; (0.5 bis 8 A!)

 

                                                

1

 

Preferred types are 

bold

; colours according to Diotec Selection Guide. Datasheets see 

www.diotec.com, “Products”. More detailed information see application note “Diotec Products for Power 
Supplies”. Though devices mentioned here are mostly SMD types for space and weight saving there are 
also equivalent leaded versions available. 

 

R

t

 

C

L

~ 

~ 

+

-

Available as single device  

on request

 

 

 

 
 

 

 
Diotec Products for 

Telecommunication

 

www.diotec.com

 11/2005 

 

 

Telecom Equipment Lightning Protection 
 
 

T

R

TNI

RD

  

 

 
Rectifier bridges are commonly used in telecommunications equipment, such as Analogue Line Cards, 
Customer Premises Equipment (CPE – phones, modems, faxes and PABX), High Speed 
Transmission equipment such as ADSL, SHDSL, ISDN or E1/T1. Rectifiers can be used as clamping / 
steering diodes or to build common protection among multiple lines.  
 
 
Recommend products

1

: 

 

Space Saving

 

 
MYS40, MS40

 

– offer space savings when having multiple lines per board (package only 3x3 mm²!)

 

 
 

Standard bridge rectifier

 

 

S40, B40S 

– for standard solutions 

 

 

Fast recovery bridges 

 

 

S

S

4

4

0

0

F

F

,

,

 

 

B

B

4

4

0

0

F

F

S

S

 

– offer a cost effective advantage of a faster recovery time during the Vf overshoot and as such reduce 
the let through energy 
 
 

Schottky bridges 

 
CS30S, CS50S

 

– Schottky bridges offer the lowest clamping 

                                                

1

 

C

olours according to Diotec Selection Guide. Datasheets see www.diotec.com, “Products”. Though devices mentioned here 

are SMD types for space and weight saving there are also equivalent leaded versions available.

 

 

 

 
 

 

 
Diotec Products for 

Telecommunication

 

www.diotec.com

 11/2005 

 

2.

5 

5.

0

 

0.

5 

0.

5 

Ty

p

e

Ty

p

Data Line Protection 

 
 

 

 

TVS-Diodes 

Available as unidirectional and bidirectional version (add suffix “C” resp. “B” at BZW-types). 
Bidirectional devices clamp both positive and negative voltage spikes.  
Dimensioning: the maximum occuring signal voltage must not exceed the stand-off voltage V

WM

 of  

the device. At a maximum current of I

PPM

 and 10/1000 µs pulse shape (see datasheet) the maximum 

clamping voltage is V

C

. The circuits (input, output) to protect should withstand at least this voltage.  

 

Types

1

 

Leaded: BZW04-…,

 P4KE…, 

BZW06-…,

 P6KE…, 1.5KE… , 5KP…; (400 to 5000 W; up to 520 V!) 

SMD:  

TGL34-… , SDA2/4AK, TGL41-…, P4SMA…,  P6SMB…, 1.5SMC… ; (150 to 1500 W; up to 550 V!) 

 
 
 
 

SDA2/4AK series: low capacitance protection 

 
Special protection devices are the SDA4AK and the SDA2AK types. They consist of antiparallel 
switched standard rectifiers in a single MELF (DO-213AB) package (see below). By this a nominal 
clamping voltage of 2 respectively 1 V is achieved, allowing peak pulse currents as high as 40 A. On 
request, also higher clamping voltages can be offered.  
The resulting capacitance of these parts are in the lower pF range, allowing for protection of high 
frequency data lines. Furthermore, these devices can be put in series to other protection devices to 
reduce their capacitance to extremely low values. 

 

 

 
 SDA4AK

 

 

SDA2AK 

 
 

                                                

1

 

Preferred types are 

bold

; colours according to Diotec Selection Guide. Datasheets see www.diotec.com, “Products”.

 

 

 

 
 

 

 
Diotec Products for 

Telecommunication

 

www.diotec.com

 11/2005 

 

Voltage Regulation 
 
 

 

 
 
 
 
 

 
 

 
Zener diodes

 for simple voltage regulation 

A simple method to provide stabilized voltages from an unregulated voltage source. The resistor has 
to be choosen so that maximum allowable zener current I

Zmax

 (see datasheet) at the maximum 

occuring input voltage and at no load at the output is not exceeded. If voltage source is formed by a 
transformer, the series resistance of the windings may be enough to provide this resistor. Power 
dissipation of below devices ranges up to 5 W (leaded) and 3 W (SMD) respectively. For higher power 
needs series connection of zener diodes can be used. 
Tolerance is graded to E24 standard (approximately +/- 5%), if tighter limits are required parts with  
+/- 2% tolerance are available on request.  

 

Types

1

 

Leaded:  

ZPD…,

 ZPY…, 

ZY…, 3EZ…,

 

1N53..B

; (0.5 to 5 W) 

SMD:  

BZX84C…,

 2BZX84C…, 

ZMM…, ZMD…,

 ZMY..., 

SMZ1..., SZ3C…, Z1SMA, Z2SMB…,  

 Z3SMC…;

 (0.2 to 3 W)

 

 
 
 
Reliable operation when lightning strikes … 

Small signal diodes like ZPD/ZMM or BZX84 are using small area, planar chips inside. Contacts are 
made either by pressure contact (glass packaged ZPD/ZMM) or wire bonds (BZX84). They provide a 
low cost solution for voltage regulation, but are more sensitive against overvoltages caused by 
lightning etc (there is always some let through energy from the primary/secondary protection when 
lightning strikes!). Power zener diodes like the ZY, ZMD, Z1SMA etc series are manufactured using 
rugged non-planar chips that have a bigger die area, and are contacted by using robust solder joints. 
They are the preferred solution for high reliability circuits.  

 

                                                

1

 

Preferred types are 

bold

; colours according to Diotec Selection Guide. Datasheets see www.diotec.com, “Products”.

 

Unregulated 
DC voltage 

Regulated 
DC voltage 

 

 

 
 

 

 
Diotec Products for 

Telecommunication

 

www.diotec.com

 11/2005 

 

 
 

OR-ing Diodes 

 

 
 
 
 
 
 
 
 
 
 
 
 

 

 
 
Decoupling of voltage sources: 

Standard

 

or 

Schottky 

Diodes

 

If low power losses are required and DC voltage is below 100 V Schottky diodes can be used. Special 
diodes (on request) offer beside 

low forward voltage drop

 also 

low leakage currents

. Standard diodes 

are suitable for higher voltages, for high current applications the usage of press-fit packages is 
possible. The D30V.. series is a 

common cathode configuration

 of standard diodes within a square 

bridge package. 

 

Types

1

 

Leaded: 

 

1N4001…7, 1N5391…99, 1N5400K…08K, 

1N5400…08

, 

BY251…55

, BY550-…,

 

P600…,

 

P1000…, P1200…;

 

(1 to 12 A) 

 

SB120…1100

, 

SB220…2100, SB320…3100, SB520…5100, SB820…8100;

 

(1 to 8 A) 

SMD: 

GL34…, 

GL1…,

 

SM4001…7

, SM5059…63, SM5400…08, 

S1…, S2…, S3…, S5…;

 (0.5 to 5 A) 

SMS120…1100, SMS220…2100, SMS32…310; SK12…110, SK32SMA…310SMA, SK52…510; 
SK82…810 (1 to 8 A!) 

Pressfit:  

BYP25…, BYP35…, BYP60…, KYW25…, KYW35…, KYZ25…, KYZ35…; (25 to 60 A) 

Square with Fast-on or Wire leads: 

D30VC20…80; (2x15 A) 

DC 

Source  

1

DC 

Source  

2