High Precision Bulk Metal

®

 Foil Molded Surface Mount Resistor

with TCR down to ± 2 ppm/°C, Flexible Terminations,

and Load Life Stability of ± 0.005 % (50 ppm)

SMR1D/SMR3D

Vishay Foil Resistors

 

Document Number: 63102

For any questions, contact: 

foil@vishaypg.com

www.foilresistors.com

Revision: 23-Mar-10

1

Any value at any tolerance available within resistance range

INTRODUCTION

The SMRxD is a precision molded surface mountable
resistor offering all the elements of precision; including low
TCR, tight tolerance, long term stability, low noise, low
thermal EMF, and non-measurable voltage coefficient. It
utilizes the Bulk Metal

®

 Foil technology for the resistive

element with its inherent low and predictable TCR and long
term stability. This surface mountable product affords similar
performance to the time tested S series molded through-hole
product.

The flexible terminations of this product also reduce
stress transference from the PCB to the resistor.

Voltage division with tight tracking < 3 ppm/°C can be
achieved with 2 

randomly

 selected units even with a large

ratio between the two values.

Our Application Engineering Department is available to
advise and make recommendations. For non-standard
technical requirements and special applications, please
contact us.

Note

1. Tighter performances are available

FEATURES



Temperature coefficient of resistance (TCR):
± 2 ppm°C typical (- 55 °C to + 125 °C,
+ 25 °C ref.)



Tolerance: to ± 0.01 %



Flexible terminations ensure minimal stress
transference from the PCB due to a difference
in thermal coefficient of expansions (TCE)



Electrostatic discharge (ESD) above 25 000 V



Load life stability: ± 0.005 % (70 °C, 2000 h at rated power)



Resistance range: 5 



 to 80 k



 (for higher and lower

values, please contact us)



Power rating: to 600 mW at 70 °C



Non inductive, non capacitive design



Current noise: - 40 dB



Voltage coefficient: < 0.1 ppm/V



Non inductive: < 0.08 µH



Non hot spot design



Terminal finishes available: 

lead (Pb)-free
tin/lead alloy



Matched sets with TCR tracking are available upon request



Any value available within resistance range (e.g. 1K234)



Prototype samples available from 48 h. For more
information, please contact 

foil@vishaypg.com



For better performances please review SMRxDZ datasheet

APPLICATIONS



Military, airborne and space



Precision amplifiers



High precision instrumentation



Medical



Automatic test equipment (ATE)



Industrial



Audio (high end stereo 
equipment)



EB application



Pulse application



Measurement instrumentation 

* Pb containing terminations are not RoHS compliant, exemptions may apply

TABLE 1 - THE SMRxD SERIES IS LISTED

IN THE FOLLOWING DSCC
SPECIFICATIONS

MODEL

DSCC

MIL SPEC

SMR1D

06020

MIL-PRF-55182

SMR3D

06021

MIL-PRF-55182

TABLE 2 - TOLERANCE AND TCR VERSUS 

RESISTANCE VALUE

(- 55 °C to + 125 °C, + 25 °C ref.)

VALUE

STANDARD 

TOLERANCE

1)

TYPICAL TCR AND 

MAX. SPREAD

1)

(ppm/°C)

50 



 to 80 k



± 0.01 %

± 2 ± 3

20 



 to < 50 



± 0.02 %

± 2 ± 4

10 



 to < 20 



± 0.05 %

± 2 ± 6

5 



 to < 10 



± 0.1 %

± 2 ± 8

FIGURE 1 - POWER DERATING CURVE

R

1

R

2

V

in

V

o

u

t

-

+

SMRxD

200

175

150

125

100

75

50

25

0

- 75

- 25

+ 25

+ 75

+ 125

+ 175

Ambient Temperature (°C)

Percent of Rated Power (

%

)

- 55 °C

+ 70 °C

SMR1D/SMR3D

Vishay Foil Resistors

 

www.foilresistors.com

For any questions, contact: 

foil@vishaypg.com

Document Number: 63102

2

Revision: 23-Mar-10

Note

1. As shown + 0.01 



 to allow for measurement error at low values

TABLE 3 - PERFORMANCE SPECIFICATIONS

TEST

CONDITIONS

MAXIMUM LIMIT

1)

SMR1D

SMR3D

SMR1D

SMR3D

Resistance Range

5 



 to 33 k



5 



 to 80 k



Rated Power

5 



 to 10 k



0.250 W at 70 °C

0.125 W at 125 °C

10 k



 to 33 k



0.160 W at 70 °C
0.08 W at 125 °C

5 



 to 30 k



0.6 W at 70 °C

0.3 W at 125 °C

30 k



 to 80 k



0.4 W at 70 °C

0.2 W at 125 °C

see figure 1

Maximum Working Voltage

73 V

180 V

Maximum Operating 
Temperature

+ 175 °C (see figure 1)

Working Temperature Range

- 55 °C to + 125 °C (MIL range)

Thermal Shock

- 65 °C to + 150 °C; 30 min; 5 cycles

± 0.01 % (100 ppm)

Short Time Overload

6.25 x rated power; 5 s

± 0.01 % (100 ppm)

Low Temperature Storage

24 h at - 65 °C

± 0.01 % (100 ppm)

Low Temperature Operation

45 min, rated power at - 65 °C

± 0.01 % (100 ppm)

Dielectric Withstanding 
Voltage

atmospheric pressure; AC 200 V; 1 min

± 0.01 % (100 ppm)

Insulation Resistance (M



)

DC 100 V; 1 min

over 10 000

Resistance to
Soldering Heat (%)

260 °C; 10 s

± 0.02 %, ± 0.01 % typical

Moisture Resistance

+ 65 °C to - 10 °C; 90 % to 98 % RH; rated power; 240 h

± 0.02 % (200 ppm)

Shock

100 G; sawtooth

± 0.01 % (100 ppm)

Vibration, High Frequency

10 ~ 2000 ~ 10 Hz; 20 G; Y, Z each 4 h

± 0.01 % (100 ppm)

Load Life Stability (2000 h)

0.04 W at + 70 °C
0.25 W at + 70 °C

0.125 W at + 125 °C

0.1 W at + 70 °C
0.6 W at + 70 °C

0.3 W at + 125 °C

Typical

0.005 %

0.02 %
0.02 %

Typical

0.005 %
0.015 %
0.015 %

High Temperature Exposure

175 °C; no load 2000 h

± 0.05 % (500 ppm)

Weight

0.1143 g

0.244 g

Packaging

bulk (loose) or tape and reel, per EIA-481-1

SMR1D/SMR3D

Vishay Foil Resistors

 

Document Number: 63102

For any questions, contact: 

foil@vishaypg.com

www.foilresistors.com

Revision: 23-Mar-10

3

FIGURE 2 - DIMENSIONS 

in inches (millimeters)

MODEL

L

W

H

P

TW

TH (minimum)

SMR1D

0.236 ± 0.012

(5.99 ± 0.30)

0.126 ± 0.012

(3.20 ± 0.30)

0.098 ± 0.012

(2.49 ± 0.30)

0.051 ± 0.012

(1.30 ± 0.30)

0.087 ± 0.004

(2.21 ± 0.10)

0.039

(0.99)

SMR3D

0.287 ± 0.012

(7.29 ± 0.30)

0.170 ± 0.012

(4.32 ± 0.30)

0.110 ± 0.012

(2.79 ± 0.30)

0.051 ± 0.012

(1.30 ± 0.30)

0.095 ± 0.004

(2.41 ± 0.10)

0.039

(0.99)

TH  Minim

u

m

Side View

Stand Off

W

Bottom View

L

P

P

End View

H

T

W

Top View

100R0T

(DATE CODE)    

-

V

TOLERA

N

CE

LEAD (P

b

)-FREE I

N

DICATOR

V

ALUE (5 DIGITS)

FIGURE 3 - RECOMMENDED MOUNTING PAD GEOMETRIES 

in inches (millimeters)

MODEL

METHOD

A 

MIN.

B 

REF

C 

REF

D 

± 0.04 (± 1.02)

E 

REF

SMR1D

Reflow

0.110

(2.79)

0.106

(2.69)

0.124

(3.15)

0.337

(8.55)

0.050

(1.27)

SMR3D

Reflow

0.118

(3.00)

0.106

(2.69)

0.175

(4.45)

0.388

(9.86)

0.050

(1.27)

Per IPC-SM-782 Rev. A

E

A

C

B

D

Reflow Solder Pads

FIGURE 4 - TRIMMING TO VALUES 

(conceptual illustration)

M

u

t

u

al Ind

u

ctance

Red

u

ction d

u

e

to Change in
C

u

rrent Direction

C

u

rrent Path

Before Trimming

Trimming Process

Remo

v

es this Material

from Shorting Strip Area

Changing C

u

rrent Path

and Increasing

Resistance

NOTE:

 Foil sho

w

n in 

b

lack, etched spaces in 

w

hite

C

u

rrent Path

After Trimming

Interloop Capacitance
Red

u

ction in Series

FIGURE 5 - TYPICAL TCR CURVE

(for more details, see table 2)

Note:

 The TCR values for < 80 



 are influenced by the

termination composition and the result in deviation from this curve

   - 50       - 25           0        + 25       + 50       + 75     + 100     + 125
- 55

± 2 ppm/°C
(+ 25 °C Reference)

+ 150

+ 100

+ 50

0 

- 50

- 100

- 150

- 200

Δ

R

R

(ppm)

Ambient Temperature  (°C) 

SMR1D/SMR3D

Vishay Foil Resistors

 

www.foilresistors.com

For any questions, contact: 

foil@vishaypg.com

Document Number: 63102

4

Revision: 23-Mar-10

Note

* For non-standard requests, please contact application engineering.

TABLE 4 - GLOBAL PART NUMBER INFORMATION

NEW GLOBAL PART NUMBER: Y112110K0000T9R (preferred part number format)

DENOTES PRECISION

VALUE

AER*

Y

R

 = 



K

 = k



0 

= standard

9

 = lead (Pb)-free

1 to 999

 = custom

PRODUCT CODE

RESISTANCE TOLERANCE

PACKAGING

1121

 = SMR1D

1169

 = SMR3D

T

= ± 0.01 %

Q

= ± 0.02 %

A

= ± 0.05 %

B

= ± 0.1 %

C

= ± 0.25 %

D

= ± 0.5 %

F

= ± 1.0 %

L

= bulk pack

R

= tape and reel

FOR EXAMPLE: ABOVE GLOBAL ORDER Y1121 10K0000 T 9 R:

TYPE: SMR1D
VALUE: 10.0 k



ABSOLUTE TOLERANCE: ± 0.01 %
TERMINATION: lead (Pb)-free
PACKAGING: tape and reel

HISTORICAL PART NUMBER: SMR1D  10K000 TCR2 T S T (will continue to be used)

SMR1D

10K000

TCR2

T

S

T

MODEL

OHMIC VALUE

TCR

CHARACTERISTIC

RESISTANCE

TOLERANCE

TERMINATION

PACKAGING

SMR1D
SMR3D

10.0 k



T

= ± 0.01 %

Q

= ± 0.02 %

A

= ± 0.05 %

B

= ± 0.1 %

C

= ± 0.25 %

D

= ± 0.5 %

F

= ± 1.0 %

S

= lead (Pb)-free

B

= tin/lead

B

= bulk pack

T

= tape and reel

1

2

1

1

K

0

0

0

Y

1

0

R

0

T

9

Vishay Precision Group

Document No.: 63999

Revision: 27-Apr-2011

www.vishaypg.com

1

Legal Disclaimer Notice

Disclaimer

Legal Disclaimer Notice

Disclaimer

Document No.: 63999

Revision: 27-Apr-2011

ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE.

Vishay Precision Group, Inc., its affiliates, agents, and employees, and all persons acting on its or their 
behalf (collectively, “Vishay Precision Group”), disclaim any and all liability for any errors, inaccuracies or 
incompleteness contained herein or in any other disclosure relating to any product.

The product specifications do not expand or otherwise modify Vishay Precision Group’s terms and 
conditions of purchase, including but not limited to, the warranty expressed therein.

Vishay Precision Group makes no warranty, representation or guarantee other than as set forth in the terms 
and conditions of purchase. 

To the maximum extent permitted by applicable law, Vishay Precision 

Group disclaims (i) any and all liability arising out of the application or use of any product, (ii) any and 
all liability, including without limitation special, consequential or incidental damages, and (iii) any and 
all implied warranties, including warranties of fitness for particular purpose, non-infringement and 
merchantability.

Information provided in datasheets and/or specifications may vary from actual results in different 
applications and performance may vary over time. Statements regarding the suitability of products for 
certain types of applications are based on Vishay Precision Group’s knowledge of typical requirements that 
are often placed on Vishay Precision Group products. It is the customer’s responsibility to validate that a 
particular product with the properties described in the product specification is suitable for use in a particular 
application.

No license, express, implied, or otherwise, to any intellectual property rights is granted by this document, or 
by any conduct of Vishay Precision Group.

The products shown herein are not designed for use in life-saving or life-sustaining applications unless 
otherwise expressly indicated. Customers using or selling Vishay Precision Group products not expressly 
indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay 
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Vishay Precision Group personnel to obtain written terms and conditions regarding products designed for 
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