Document Number: 30110

For technical questions, contact: ww2bresistors@vishay.com

www.vishay.com

Revision: 29-Mar-07

17

WSL3921 and WSL5931

Low Value (down to 0.0002

Ω), Surface Mount

Vishay Dale

DIMENSIONS

Note

• Embossed carrier tape per EIA-481-1A

H

L

T

W

D

I

d

b

70

Derating

120

100

80

60

40

20

0

175

150

125

100

75

50

25

0

- 25

- 50

- 65

Ambient Temperature in °C

MODEL

DIMENSIONS in inches [millimeters]

LW

H

T

WSL3921

0.394 ±

0.010

0.205 ± 0.010

[5.20 ± 0.254]

0.020

[0.5]

0.080 ± 0.010

[2.00 ± 0.254]

WSL5931

0.591 ±

0.010

0.305 ± 0.010

[7.75 ± 0.254]

0.020

[0.5]

0.157 ± 0.010

[4.00 ± 0.254]

MODEL

SOLDER PAD DIMENSIONS in inches [millimeters]

db

l

WSL3921

0.106 ± 0.010

[2.70 ± 0.254]

0.244 ± 0.010

[6.20 ± 0.254]

0.220 ± 0.005

[5.60 ± 0.13]

WSL5931

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

“D”

THICKNESS

ELEMENT

MATERIAL

WSL3921

0.3

0.0510

Mn-Cu

WSL3921

0.5

0.0300

Mn-Cu

WSL3921

1.0

0.0150

Mn-Cu

WSL3921

2.0

0.0270

Fe-Cr

WSL3921

3.0

0.0170

Fe-Cr

WSL3921

4.0

0.0130

Fe-Cr

WSL5931

0.2

0.0485

Mn-Cu

WSL5931

0.3

0.0300

Mn-Cu

WSL5931

0.5

0.0180

Mn-Cu

WSL5931

1.0

0.0330

Fe-Cr

WSL5931

2.0

0.0155

Fe-Cr

WSL5931

3.0

0.0105

Fe-Cr

PERFORMANCE

TEST

CONDITIONS OF TEST

TEST LIMITS

Thermal Shock

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

± (1.0 % + 0.0005

Ω) ΔR

Short Time Overload

5 x rated power for 5 s

± (0.5 % + 0.0005

Ω) ΔR

Low Temperature Storage

- 65 °C for 45 min

± (0.5 % + 0.0005

Ω) ΔR

High Temperature Exposure

1000 h at + 175 °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 + 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

PIECES/REEL

CODE

WSL3921

16 mm/Embossed Plastic

330 mm/13"

3000

EA

WSL5931

16 mm/Embossed Plastic

330 mm/13"

1500

EA