Document Number: 30160

www.vishay.com

Revision: 02-Jul-10

43

WSMS2908

Very Low Value (down to 0.0001

Ω)

Vishay Dale

DIMENSIONS in inches (millimeters)

DERATING

1.142 (29.0) ± 0.010

CALIBRATION NOTCH

TERMINAL THICKNESS 0.040 (1.0)

ALL VALUES

0.787 (20.0)

Ø 0.165 (Ø 4.2)

2 PLACES

90° ± 0.2°

0.110 (2.8)

0.142 (3.6)

0.157 (4.0)

0.059 (1.5)

0.453 (11.5)

0.118 (3.0)

0.315 (8.0)

0.157 (4.0)

70

120

100

80

60

40

20

0

175

150

125

100

75

50

25

0

- 25

- 50

- 65

Ambient Temperature in °C

TOLERANCES ON DECIMALS

XXX ± 0.005

RESISTANCE

VALUE

(μ

Ω)

RESISTOR

ELEMENT

THICKNESS

(inches)

ELEMENT

LENGTH

ELEMENT

MATERIAL

100

0.040

0.080

Mn-Cu

250

0.059

0.276

Mn-Cu

300

0.051

0.276

Mn-Cu

430

0.038

0.315

Mn-Cu

500

0.033

0.315

Mn-Cu

PERFORMANCE

TEST

CONDITIONS OF TEST

TEST LIMITS

Thermal Shock

- 55 °C to + 150 °C, 1000 cycles, 15 min at each extreme

± 0.5 %

ΔR

Short Time Overload

5 x rated power for 5 s

± 0.5 %

ΔR

Low Temperature Operation

- 65 °C for 45 min

± 0.5 %

ΔR

High Temperature Exposure

1000 h at + 170 °C

± 1.0 %

ΔR

Bias Humidity

+ 85 °C, 85 % RH, 10 % bias, 1000 h

± 0.5 %

ΔR

Mechanical Shock

100 g’s for 6 ms, 5 pulses

± 0.5 %

ΔR

Vibration

Frequency varied 10 Hz to 2000 Hz in 1 min, 3 directions, 12 h

± 0.5 %

ΔR

Load Life

1000 h at + 70 °C, 1.5 h “ON”, 0.5 h “OFF”

± 1.0 %

ΔR

Moisture Resistance

MIL-STD-202, method 106, 0 % power, 7b not required

± 0.5 %

ΔR