WSLP3921, WSLP5931

www.vishay.com

Vishay Dale

Revision: 12-Oct-2020

2

Document Number: 30176

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

Notes

(1) Component TCR - total TCR that includes the TCR effects of the resistor element and the copper terminal

(2) Element TCR - only applies to the alloy used for the resistor element

(3) Maximum working voltage - the WSL is not voltage sensitive, but is limited by power / energy dissipation and is also not ESD sensitive

DIMENSIONS in inches (millimeters)

CONSTRUCTION OUTLINE

Notes

• 3D models available: 3921 model www.vishay.com/doc?30315; 5931 model www.vishay.com/doc?30317

• Surface mount solder profile recommendations: www.vishay.com/doc?31052

Note

(1) H dimension is reference only. Total height reference is H dimension + D thickness

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

TECHNICAL SPECIFICATIONS

PARAMETER

UNIT

RESISTOR CHARACTERISTICS

WSLP3921

WSLP5931

Component temperature coefficient

(including terminal) (1)



TCR measured from -55 °C to 150 °C

ppm/°C

± 350 for 0.1 m



± 300 for 0.1 m



+150 for 0.2 m



± 225 for 0.2 m



+170 for 0.3 m



± 175 for 0.3 m

 and 0.5 m

+150 for 0.5 m

 to 1 m

± 75 for 1 m

 to 4 m

+50 for 1.5 m

 to 4 m

-

Element TCR (2)

ppm/°C

< 20

Operating temperature range

°C

-65 to +170

Maximum working voltage (3)

V(P x R)1/2

H

L

T

W

D

I

d

b

Typical sensing traces

Resistive element:

refer to table below

for element material

1

Terminal: solid copper

2

Terminal / element weld

3

1

2

3

MODEL

DIMENSIONS in inches (millimeters)

SOLDER PAD DIMENSIONS in inches (millimeters)

LW

H (1)

Td

b

l

WSLP3921

0.394 ± 0.010

(10.0 ± 0.254)

0.205 ± 0.010

(5.20 ± 0.254)

0.020

(0.5)

0.080 ± 0.010

(2.00 ± 0.254)

0.106 ± 0.010

(2.70 ± 0.254)

0.244 ± 0.010

(6.20 ± 0.254)

0.220 ± 0.005

(5.60 ± 0.13)

WSLP3921



(0.1 m

 only)

0.020 ± 0.005

(0.5 ± 0.127)

0.130 ± 0.010

(3.30 ± 0.254)

WSLP5931

0.591 ± 0.010

(15.0 ± 0.254)

0.305 ± 0.010

(7.75 ± 0.254)

0.020

(0.5)

0.157 ± 0.010

(4.00 ± 0.254)

0.205 ± 0.010

(5.20 ± 0.254)

0.344 ± 0.010

(8.75 ± 0.254)

0.220 ± 0.005

(5.60 ± 0.13)

GLOBAL MODEL

RESISTANCE VALUE

(m

)

THERMAL RESISTANCE (1)

(°C/W)

“D” THICKNESS

(Inches)

ELEMENT MATERIAL

WSLP3921

0.1

0.9

0.0560

Mn-Cu-Sn

WSLP3921

0.2

2.7

0.0560

Mn-Cu-Sn

WSLP3921

0.3

3.8

0.0510

Mn-Cu

WSLP3921

0.5

5.8

0.0300

Mn-Cu

WSLP3921

0.7

6.3

0.0205

Mn-Cu

WSLP3921

1.0

10.9

0.0150

Mn-Cu

WSLP3921

1.5

8.3

0.0360

Fe-Cr

WSLP3921

2.0

12.0

0.0270

Fe-Cr

WSLP3921

3.0

20.7

0.0170

Fe-Cr

WSLP3921

4.0

22.8

0.0130

Fe-Cr

WSLP5931

0.1

1.6

0.0560

Mn-Cu-Sn

WSLP5931

0.2

2.4

0.0490

Mn-Cu

WSLP5931

0.3

3.5

0.0300

Mn-Cu

WSLP5931

0.5

5.7

0.0180

Mn-Cu

WSLP5931

1.0

7.2

0.0330

Fe-Cr

WSLP5931

2.0

13.2

0.0155

Fe-Cr

WSLP5931

3.0

19.3

0.0105

Fe-Cr