WFM datasheet(2/5 Pages) VISHAY

2 / 5 page

WFM

www.vishay.com

Vishay Dale

Revision: 04-Aug-2022

Document Number: 30387

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

• “Temperature Coefficient of Resistance for Current Sensing” white paper: www.vishay.com/doc?30405

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

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

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

DIMENSIONS

CONSTRUCTION OUTLINE (1)

Notes

• 3D models available: www.vishay.com/doc?30401

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

(1) For construction advantages and performance details refer to “Did You Know?”: www.vishay.com/doc?48567

TECHNICAL SPECIFICATIONS

PARAMETER

UNIT

MODEL

RESISTOR CHARACTERISTICS

2010

2512

Temperature coefficient

(20 °C to 60 °C)

(element only) (1)

ppm/°C

All

< 20

Operating temperature range

°C

All

-65 to +170

Maximum working voltage (3)

VAll

(P x R)1/2

Maximum terminal temperature

°C

All

110

Temperature coefficient

(-55 °C to +150 °C)

(including terminals) (2)

ppm/°C

WFMA

± 110

WFMB

± 50

Temperature coefficient

(20 °C to 60 °C)

(including terminals) (2)

ppm/°C

WFMA

± 30

± 40

WFMB

± 20

Typical sensing traces

Sn plating

Ni plating

Adhesive

Cu heat spreaders

Overcoat

Cu plating

Resistive element

CASE

SIZE

RESISTANCE

RANGE

Ω)

DIMENSIONS in inches (millimeters)

SOLDER PAD DIMENSIONS

in inches (millimeters)

2010

10 to 500

0.200 ± 0.008

(5.08 ± 0.20)

0.100 ± 0.008

(2.54 ± 0.20)

0.020 ± 0.006

(0.50 ± 0.15)

0.028 ± 0.008

(0.70 ± 0.20)

0.016 ± 0.006

(0.40 ± 0.15)

0.049

(1.25)

0.118

(3.00)

0.138

(3.50)

2512

10 to 500

0.250 ± 0.012

(6.35 ± 0.30)

0.125 ± 0.008

(3.18 ± 0.20)

0.020 ± 0.006

(0.50 ± 0.15)

0.035 ± 0.008

(0.90 ± 0.20)

0.020 ± 0.008

(0.50 ± 0.20)

0.061

(1.55)

0.142

(3.60)

0.173

(4.40)

PRODUCT

RESISTANCE RANGE

(

Ω)

THERMAL RESISTANCE

(°C/W)

ALLOY

WFMA2010

0.01 to 0.0329

< 30

Mn-Cu

WFMB2010

0.033 to 0.5

< 55

Ni-Cr

WFMA2512

0.01 to 0.0329

< 25

Mn-Cu

WFMB2512

0.033 to 0.5

< 40

Ni-Cr

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