Power Metal Strip
Resistors, Low Value, Surface Mount
www.vishay.com
For technical questions contact: ww2bresistors@vishay.com
Document Number: 30110
206
Revision: 29-Mar-05
WSL3921 and WSL5931
Vishay Dale
FEATURES
Ideal for all types of current sensing, voltage division and
pulse applications including switching and linear power
supplies, instruments, power amplifiers
Proprietary processing technique produces extremely low
resistance values
All welded construction
Solid metal Iron-chrome or Manganese-copper alloy
resistive element
Very low inductance 0.5nH to 5nH
Excellent frequency response
Low thermal EMF
Part Marking: no part marking on these parts
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL
POWER RATING
P
70C
W
TOLERANCE
%
RESISTANCE VALUES
AVAILABLE
m
WEIGHT
(TYPICAL)
g/1000 pcs
WSL3921
3.0
1.0 & 5.0
0.3, 0.5, 1, 2, 3, 4
281
WSL5931
5.0
1.0 & 5.0
0.2, 0.3, 0.5, 1, 2, 3
398
TECHNICAL SPECIFICATIONS
PARAMETER
UNIT
WSL RESISTOR CHARACTERISTICS
Temperature Coefficient
ppm/C
175 for 0.3m
and 0.5m, 75 for 1m to 4m
Operating Temperature Range
C
- 65 / + 170
Maximum Working Voltage
V
(P x R)
1/2
GLOBAL MODEL
SPECIAL
WSL3637
L = Milliohm
F =
1.0%
EA = Lead Free, Tape/Reel
(Dash Number)
WSL5931
L5000 = 0.0005
J =
5.0%
EK = Lead Free, Bulk
(up to 2 digits)
From 1-99 as
applicable
GLOBAL PART NUMBER INFORMATION
Global Part Numbering: WSL3921L5000FEA
W
S
L
3
9
2
1
L
5
0
0
0
F
E
A
RESISTANCE VALUE
TOLERANCE CODE
PACKAGING CODE
Document Number: 30110
For technical questions contact: ww2bresistors@vishay.com
www.vishay.com
Revision: 29-Mar-05
207
WSL3921 and WSL5931
Power Metal Strip
Resistors, Low Value, Surface Mount
Vishay Dale
DIMENSIONS
H
L
T
W
D
I
d
b
MODEL
DIMENSIONS in inches [millimeters]
L
W
H
T
WSL3921
0.394 0.010
[10.0 0.254]
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
[15.0 0.254]
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]
d
b
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]
Embossed carrier tape per EIA-481-1A.
70
Derating
120
100
80
60
40
20
0
-65 -50 -25 0 25 50 75 100 125 150
175
Ambient Temperature in
C
Rated Power In %
GLOBAL
MODEL
RESISTANCE VALUE
m
"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
- 55C to + 150C, 1000 cycles, 15 minutes at each extreme
(1.0% + 0.0005
) R
Short Time Overload
5 x rated power for 5 seconds
(0.5% + 0.0005
) R
Low Temperature Storage
- 65C for 45 Min.
(0.5% + 0.0005
) R
High Temperature Exposure
1000 hours at + 175C
(1.0% + 0.0005
) R
Bias Humidity
+ 85C, 85% RH, 10% Bias, 1000 hours
(0.5% + 0.0005
) R
Mechanical Shock
100g's for 6 milliseconds, 5 pulses
(0.5% + 0.0005
) R
Vibration
Frequency varied 10 to 2000Hz in one minute, 3 directions, 12 hours
(0.5% + 0.0005
) R
Load Life
1000 hours at + 70C, 1.5 hours "ON", 0.5 hours "OFF"
(1.0% + 0.0005
) R
Resistance to Solder Heat
+ 260C Solder, 10 - 12 second dwell, 25mm/second emergence
(0.5% + 0.0005
) R
Moisture Resistance
MIL-STD-202, Method 106, 0% power, 7a and 7b not required
(0.5% + 0.0005
) R
PACKAGING
MODEL
REEL
TAPE WIDTH
DIAMETER
PIECES/REEL
CODE
WSL3921
16mm/Embossed Plastic
330mm/13"
3000
EA
WSL5931
16mm/Embossed Plastic
330mm/13"
2000
EA
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