WSL3921, WSL5931

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Vishay Dale

Upgrade for TCR to Kelvin Termination With WSL2726

Revision: 29-Aug-2025

3

Document Number: 30110

For technical questions, contact: ww2bresistors@vishay.com

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

Note

(1) The full power rating of power metal strip resistors are dependent upon the ability of the circuit board to dissipate the heat energy created

in the resistance element. It is recommended to follow common design practices for power semiconductors that ensure the junction

temperature is maintained with in thermal limits by using large pad surfaces, thermal vias, heavier copper weights, internal layers as well as

other thermal spreading features. The thermal resistance values provided function in the same manner as junction to terminal temperature

DERATING - AMBIENT TEMPERATURE

DERATING - TERMINAL TEMPERATURE

PULSE CAPABILITY

www.vishay.com/en/resistors/joulewizard/

GLOBAL

MODEL

RESISTANCE VALUE

(m

Ω)

TYPICAL THERMAL RESISTANCE

(°C/W) (1)

“D” THICKNESS

(INCHES)

ELEMENT

MATERIAL

WSL3921

0.1

0.9

0.0560

Mn-Cu-Sn

WSL3921

0.2

2.7

0.0560

Mn-Cu-Sn

WSL3921

0.3

3.8

0.0510

Mn-Cu

WSL3921

0.4

4.3

0.0350

Mn-Cu

WSL3921

0.5

5.8

0.0300

Mn-Cu

WSL3921

0.7

6.3

0.0205

Mn-Cu

WSL3921

1.0

10.9

0.0150

Mn-Cu

WSL3921

1.5

8.3

0.0360

Fe-Cr-Al

WSL3921

2.0

12.0

0.0270

Fe-Cr-Al

WSL3921

3.0

20.7

0.0170

Fe-Cr-Al

WSL3921

4.0

22.8

0.0130

Fe-Cr-Al

WSL5931

0.1

1.6

0.0560

Mn-Cu-Sn

WSL5931

0.2

2.4

0.0485

Mn-Cu

WSL5931

0.3

3.5

0.0300

Mn-Cu

WSL5931

0.5

5.7

0.0180

Mn-Cu

WSL5931

1.0

7.2

0.0330

Fe-Cr-Al

WSL5931

2.0

13.2

0.0155

Fe-Cr-Al

WSL5931

3.0

19.3

0.0105

Fe-Cr-Al

10

100

1000

10000

0

20

40

60

80

100

120

-65-55 -25

0

25 50

100 125 150 170

Axis Title

Ambient Temperature (°C)

70

10

100

1000

10000

0

20

40

60

80

100

120

0

20406080 100 120 140 160 180

Axis Title

T

K - Terminal Temperature (°C)

Stability < 1.0 %

Stability < 0.5 %

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(ILLUSTRATIVE PURPOSES ONLY)