WSLF datasheet(2/4 Pages) VISHAY

2 / 4 page

WSLF

www.vishay.com

Vishay Dale

Revision: 28-Jun-2022

Document Number: 30193

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: www.vishay.com/doc?30335

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

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

WSLF RESISTOR CHARACTERISTICS

Component temperature coefficient

(including terminal) (1)

TCR measured from -55 °C to 150 °C

ppm/°C

± 200 for 0.3 m

Ω and 0.5 mΩ

± 170 for 1.0 m

Ω, 1.3 mΩ, and 1.5 mΩ

± 70 for 2 m

Ω, 3 mΩ, and 4 mΩ

Element TCR (2)

ppm/°C

< 20

Operating temperature range

°C

-65 to +170

Maximum working voltage (3)

V(P x R)1/2

Typical current sensing traces

Resistive element: element material used is

dependent on resistance value. Refer to

Element Material in table)

Terminal: solid copper

Terminal / element weld

MODEL

DIMENSIONS

SOLDER PAD DIMENSIONS

WSLF2512

0.250 ± 0.006

(6.35 ± 0.15)

0.120 ± 0.008

(3.02 ± 0.2)

0.0138 ± 0.0012

(0.35 ± 0.03)

0.045 - 0.016

(1.14 - 0.4)

0.071

(1.80)

0.13

(3.40)

0.13

(3.40)

GLOBAL

MODEL

RESISTANCE

VALUE

(mΩ)

THERMAL

RESISTANCE

(°C/W)

THICKNESS in inches (millimeters)

ELEMENT MATERIAL

WSLF2512

0.3

3.8

0.040 (1.02)

Mn-Cu-Sn

0.5

6.7

0.033 (0.84)

Mn-Cu

1.0

12.1

0.017 (0.43)

Mn-Cu

1.3

14.6

0.013 (0.33)

Mn-Cu

1.5

14.5

0.011 (0.28)

Mn-Cu

2.0

17.1

0.028 (0.71)

Ni-Cr

3.0

18.2

0.019 (0.48)

Ni-Cr

4.0

18.5

0.014 (0.36)

Ni-Cr

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