WSL3921, WSL5931
www.vishay.com
Vishay Dale
Power Metal Strip® Resistors,
Low Value (Down to 0.0001 Ω), Surface-Mount
FEATURES
• All welded construction of the Power Metal
Strip® resistors are ideal for all types of current
sensing,
voltage
division
and
pulse
applications
• Proprietary processing technique produces
extremely low resistance values, down to
0.0001 Ω
• Sulfur resistance by construction that is
unaffected by high sulfur environments
• Solid metal iron-chrome or manganese-copper alloy
resistive element with low TCR (< 20 ppm/°C)
LINKS TO ADDITIONAL RESOURCES
3D 3D
• Very low inductance 0.5 nH to 5 nH
3D Models
Upgrade
Performance
Design Tools
• Low thermal EMF (< 3 μV/°C)
• AEC-Q200 qualified (1)
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
Notes
• Follow link to Overview of Automotive Grade Products for more details: www.vishay.com/doc?49924
(1) Flame retardance test may not be applicable to some resistor technologies
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL
SIZE
WSL3921
3921
WSL5931
5931
POWER RATING
TOLERANCE
P70 °C
%
W
RESISTANCE
VALUE RANGE
Ω
RESISTANCE VALUES
CURRENTLY AVAILABLE (1)
Ω
WEIGHT
(typical)
g/1000 pieces
0.1m to 4m
0.1m, 0.2m, 0.3m, 0.5m, 0.7m, 1m, 1.5m,
2m, 2.5m, 3m, 4m
281
3.0
1.0, 5.0
5.0
1.0, 5.0
2m to 3m
2m, 3m
398
5.0
1.0, 5.0
0.1m to 1m
0.1m, 0.2m, 0.3m, 0.5m, 1m
1253
Note
(1) Other values may be available, contact factory
GLOBAL PART NUMBER INFORMATION
Global Part Numbering: WSL3921L5000FEA (WSL3921, 0.0005 Ω, ± 1 %)
(visit www.vishay.net Vishay Dale parts numbering manual for all options)
W
S
L
3
9
2
1
L
5
0
0
0
F
E
A
GLOBAL MODEL
(7 digits)
RESISTANCE VALUE (1)
(5 digits)
TOLERANCE CODE
(1 digit)
PACKAGING CODE (2)
(2 digits)
SPECIAL (3)
(up to 2 digits)
WSL3921
WSL5931
L = mΩ
L5000 = 0.0005 Ω
F = ± 1.0 %
J = ± 5.0 %
EA = lead (Pb)-free, tape/reel
(dash number)
(up to 2 digits)
from 1 to 99 as
applicable
Notes
(1) WSL marking (www.vishay.com/doc?30327)
(2) Packaging code: EB (lead (Pb)-free) is a non-standard packaging code that designates a 1000 piece reel size. The non-standard packaging
code is identical to our standard EA (lead (Pb)-free) packaged code, except that it has a package quantity of 1000 pieces
(3) Follow link for customization capabilities: www.vishay.com/doc?48163
Revision: 06-Dec-2021
Document Number: 30110
1
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
WSL3921, WSL5931
www.vishay.com
Vishay Dale
TECHNICAL SPECIFICATIONS
PARAMETER
RESISTOR CHARACTERISTICS
WSL3921
WSL5931
± 350 for 0.1 mΩ
+300 for 0.1 mΩ (+25 °C to +170 °C)
± 150 for 0.2 mΩ
± 225 for 0.2 mΩ
± 170 for 0.3 mΩ
± 175 for 0.3 mΩ and 0.5 mΩ
± 150 for 0.5 mΩ to 1 mΩ
± 75 for 1 mΩ to 3 mΩ
± 50 for 1.5 mΩ to 4 mΩ
< 20
-65 to +170
(P x R)1/2
UNIT
Component temperature coefficient
(including terminal) (1)
TCR measured from -55 °C to 150 °C
ppm/°C
ppm/°C
Element TCR (2)
Operating temperature range
°C
V
Maximum working voltage (3)
Notes
(1) Component TCR - total TCR that includes the TCR effects of the resistor element and the copper terminal
(2) Element TCR - only applies to the alloy used for the resistor element; refer to item 1 in the construction illustration on the following page
(3) Maximum working voltage - the WSL is not voltage sensitive, but is limited by power / energy dissipation and is also not ESD sensitive
DIMENSIONS in inches (millimeters)
CONSTRUCTION OUTLINE
Typical sensing traces
1 Resistive element:
refer to table below
for element material
I
b
1
H
L
W
D
2 Terminal: solid copper
3 Terminal / element weld
d
3
2
T
Notes
• 3D models available: 3921 model www.vishay.com/doc?30315; 5931 model www.vishay.com/doc?30317
• Surface mount solder profile recommendations: www.vishay.com/doc?31052
MODEL
WSL3921
WSL3921
(0.1 mΩ only)
WSL5931
L
DIMENSIONS in inches (millimeters)
W
H (1)
0.394 ± 0.010
(10.0 ± 0.254)
0.205 ± 0.015
(5.20 ± 0.381)
0.020
(0.5)
0.591 ± 0.010
(15.0 ± 0.254)
0.305 ± 0.015
(7.75 ± 0.381)
0.020
(0.5)
T
0.080 ± 0.010
(2.00 ± 0.254)
0.130 ± 0.010
(3.30 ± 0.254)
0.157 ± 0.010
(4.00 ± 0.254)
SOLDER PAD DIMENSIONS in inches (millimeters)
d
b
l
0.106 ± 0.010
0.220 ± 0.005
(2.70 ± 0.254)
(5.60 ± 0.13)
0.244 ± 0.010
(6.20 ± 0.254)
0.156 ± 0.010
0.148 ± 0.005
(3.96 ± 0.254)
(3.76 ± 0.13)
0.205 ± 0.010
0.344 ± 0.010
0.220 ± 0.005
(5.20 ± 0.254)
(8.75 ± 0.254)
(5.60 ± 0.13)
Note
(1) H dimension is reference only. Total height is H dimension + D thickness ± 0.010" (± 0.254 mm)
GLOBAL
RESISTANCE VALUE
TYPICAL THERMAL RESISTANCE
“D” THICKNESS
ELEMENT
MODEL
(mΩ)
(°C/W) (1)
(INCHES)
MATERIAL
WSL3921
0.1
0.9
0.0560
Mn-Cu-Sn
WSL3921
0.2
2.7
0.0560
Mn-Cu-Sn
WSL3921
0.3
3.8
0.0510
Mn-Cu
WSL3921
0.5
5.8
0.0300
Mn-Cu
WSL3921
0.7
6.3
0.0205
Mn-Cu
WSL3921
1.0
10.9
0.0150
Mn-Cu
WSL3921
1.5
8.3
0.0360
Fe-Cr
WSL3921
2.0
12.0
0.0270
Fe-Cr
WSL3921
3.0
20.7
0.0170
Fe-Cr
WSL3921
4.0
22.8
0.0130
Fe-Cr
WSL5931
0.1
1.6
0.0560
Mn-Cu-Sn
WSL5931
0.2
2.4
0.0485
Mn-Cu
WSL5931
0.3
3.5
0.0300
Mn-Cu
WSL5931
0.5
5.7
0.0180
Mn-Cu
WSL5931
1.0
7.2
0.0330
Fe-Cr
WSL5931
2.0
13.2
0.0155
Fe-Cr
WSL5931
3.0
19.3
0.0105
Fe-Cr
Note
(1) The full power rating of power metal strip resistors are dependent upon the ability of the circuit board to dissipate the heat energy created
in the resistance element. It is recommended to follow common design practices for power semiconductors that ensure the junction
temperature is maintained with in thermal limits by using large pad surfaces, thermal vias, heavier copper weights, internal layers as well as
other thermal spreading features. The thermal resistance values provided function in the same manner as junction to terminal temperature
Revision: 06-Dec-2021
Document Number: 30110
2
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
WSL3921, WSL5931
www.vishay.com
Vishay Dale
DERATING - AMBIENT TEMPERATURE
DERATING - TERMINAL TEMPERATURE
10000
120
10000
120
Stability < 1.0 %
60
100
40
20
0
-65-55 -25
1000
80
1st line
2nd line
1000
80
2nd line
P/PNorm. (%)
100
1st line
2nd line
2nd line
Rated Power (%)
100
60
Stability < 0.5 %
100
40
20
10
0
10
0
25
50 70 100 125 150 170
Ambient Temperature (°C)
0
20
40
60
80 100 120 140 160 180
TK - Terminal Temperature (°C)
PULSE CAPABILITY
click to get started
VE
TI
A
R
ST
U
ILL
S
SE
O
RP
PU
LY
ON
www.vishay.com/resistors/power-metal-strip-calculator
PERFORMANCE
TEST
Thermal shock
Short time overload
Low temperature storage
High temperature exposure
Bias humidity
Mechanical shock
Vibration
Load life
Resistance to solder heat
Moisture resistance
CONDITIONS OF TEST
-55 °C to +150 °C, 1000 cycles, 15 min at each extreme
Refer to link for short time overload performance and pulse capability;
www.vishay.com/resistors/power-metal-strip-calculator/
-65 °C for 24 h
1000 h at +170 °C
+85 °C, 85 % RH, 10 % bias, 1000 h
100 g’s for 6 ms, 5 pulses
Frequency varied 10 Hz to 2000 Hz in 1 min, 3 directions, 12 h
1000 h at +70 °C, 1.5 h “ON”, 0.5 h “OFF”
3 x at 250 °C ± 5 °C for 30 s ± 5 s
MIL-STD-202, method 106, 0 % power, 7a and 7b not required
TEST LIMITS
± 1.0 %
± 0.5 %
± 0.5 %
± 1.0 %
± 0.5 %
± 0.5 %
± 0.5 %
± 1.0 %
± 0.5 %
± 0.5 %
Note
• Contact ww2bresistors@vishay.com for application specific performance requirements. Typical performance is better than stated test limits
PACKAGING
MODEL
WSL3921
WSL5931
TAPE WIDTH
16 mm / embossed plastic
24 mm / embossed plastic
REEL
DIAMETER
330 mm / 13"
330 mm / 13"
PIECES/REEL
3000
1500
CODE
EA
EA
Notes
• Embossed carrier tape per EIA-481
(1) Additional packaging details at www.vishay.com/doc?20051
Revision: 06-Dec-2021
Document Number: 30110
3
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
Legal Disclaimer Notice
www.vishay.com
Vishay
Disclaimer
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Revision: 09-Jul-2021
1
Document Number: 91000