Document Number: 30108

For technical questions, contact: ww2bresistors@vishay.com

www.vishay.com

Revision: 26-Mar-07

21

WSK

Low Value (down to 0.001

Ω), Surface Mount, 4-Terminal

Vishay Dale

DIMENSIONS

Note

• Embossed carrier tape per EIA-481-1A

L

W

H

T

A

B

l

a

e

b

d

c

MODEL

DIMENSIONS in inches [millimeters]

RESISTANCE

RANGE

Ω

LW

H

T

A

B

WSK2512

0.001 - 0.0049

0.250 ± 0.010

[6.35 ± 0.254]

0.125 ± 0.010

[3.18 ± 0.254]

0.025 ± 0.010

[0.635 ± 0.254]

0.087 ± 0.010

[2.21 ± 0.254]

0.030 ± 0.010

[0.762 ± 0.254]

0.020 ± 0.010

[0.508 ± 0.254]

0.005 - 0.025

0.250 ± 0.010

[6.35 ± 0.254]

0.125 ± 0.010

[3.18 ± 0.254]

0.025 ± 0.010

[0.635 ± 0.254]

0.047 ± 0.010

[1.19 ± 0.254]

0.030 ± 0.010

[0.762 ± 0.254]

0.020 ± 0.010

[0.508 ± 0.254]

MODEL

SOLDER PAD DIMENSIONS in inches [millimeters]

ab

c

d

e

I

WSK2512

0.125 [3.18]

0.130 [3.30]

0.030 [0.76]

0.020 [0.51]

0.055 [1.40]

0.065 [1.65]

70

0

Derating

- 65 - 55 - 25

0

25

50

75

100 125

150

170

Ambient Temperature °C

20

40

60

80

100

120

PERFORMANCE

TEST

CONDITIONS OF TEST

TEST LIMITS

Thermal Shock

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

± (0.5 % + 0.0005

Ω) ΔR

Short Time Overload

5 x power for 5 s

± (0.5 % + 0.0005

Ω) ΔR

Low Temperature Storage

- 65 °C for 24 h

± (0.5 % + 0.0005

Ω) ΔR

High Temperature Exposure

1000 h at + 170 °C

± (1.0 % + 0.0005

Ω) ΔR

Bias Humidity

+ 85 °C, 85 % RH, 10 % Bias, 1000 h

± (0.5 % + 0.0005

Ω) ΔR

Mechanical Shock

100 g’s for 6 ms, 5 pulses

± (0.5 % + 0.0005

Ω) ΔR

Vibration

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

± (0.5 % + 0.0005

Ω) ΔR

Load Life

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

± (1.0 % + 0.0005

Ω) ΔR

Resistance to Solder Heat

+ 260 °C Solder, 10 - 12 s dwell, 25 mm/s emergence

± (0.5 % + 0.0005

Ω) ΔR

Moisture Resistance

MIL-STD-202 Method 106, 0 % power, 7a and 7b not required

± (0.5 % + 0.0005

Ω) ΔR

PACKAGING

MODEL

REEL

TAPE WIDTH

DIAMETER

RIECES/REEL

CODE

WSK2512

12 mm/Embossed Plastic

178 mm/7"

2000

R86