Upgrade for TCR to Kelvin Termination With WSL2726
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)
• Very low inductance 0.5 nH to 5 nH
• Low thermal EMF (< 3 μV/°C)
• AEC-Q200 qualified (1)
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
LINKS TO ADDITIONAL RESOURCES
3D 3D
3D Models
Upgrade
Performance
Design Tools
Notes
• Follow link to Overview of Automotive Grade Products for more details: www.vishay.com/doc?49924
• “SMD Current Sense: AEC-Q200 vs. Vishay Qualification” technical note: www.vishay.com/doc?30416
(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, 0.4m, 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
Notes
• “Thermal Management for Surface-Mount Devices” white paper: www.vishay.com/doc?30380
(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: 19-Jul-2022
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
Upgrade for TCR to Kelvin Termination With WSL2726
WSL3921, WSL5931
www.vishay.com
Vishay Dale
TECHNICAL SPECIFICATIONS
PARAMETER
RESISTOR CHARACTERISTICS
UNIT
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 and 0.4 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
Component temperature coefficient
(including terminal) (1)
TCR measured from -55 °C to 150 °C
ppm/°C
Element TCR (2)
ppm/°C
< 20
°C
-65 to +170
V
(P x R)1/2
± 50 for 1.5 mΩ to 4 mΩ
Operating temperature range
Maximum working voltage
(3)
-
Notes
• Consult factory for detailed TCR performance across full temperature range as performance is resistance value specific
• “Temperature Coefficient of Resistance for Current Sensing” white paper: www.vishay.com/doc?30405
(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
L
W
3 Terminal / element weld
d
D
2 Terminal: solid copper
1
H
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
DIMENSIONS in inches (millimeters)
MODEL
WSL3921
WSL3921
(0.1 mΩ only)
WSL5931
L
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)
SOLDER PAD DIMENSIONS in inches (millimeters)
T
d
0.080 ± 0.010
(2.00 ± 0.254)
0.106 ± 0.010
(2.70 ± 0.254)
0.130 ± 0.010
(3.30 ± 0.254)
0.156 ± 0.010
(3.96 ± 0.254)
0.157 ± 0.010
(4.00 ± 0.254)
0.205 ± 0.010
(5.20 ± 0.254)
b
0.244 ± 0.010
(6.20 ± 0.254)
0.344 ± 0.010
(8.75 ± 0.254)
l
0.220 ± 0.005
(5.60 ± 0.13)
0.148 ± 0.005
(3.76 ± 0.13)
0.220 ± 0.005
(5.60 ± 0.13)
Note
(1) H dimension is reference only. Total height is H dimension + D thickness ± 0.010" (± 0.254 mm)
Revision: 19-Jul-2022
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
Upgrade for TCR to Kelvin Termination With WSL2726
WSL3921, WSL5931
www.vishay.com
Vishay Dale
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
0.4
4.3
0.0350
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
DERATING - AMBIENT TEMPERATURE
DERATING - TERMINAL TEMPERATURE
Axis Title
Axis Title
10000
120
10000
120
Stability < 1.0 %
100
100
40
60
Stability < 0.5 %
100
40
20
20
0
-65-55 -25
1000
80
1st line
2nd line
60
2nd line
P/PNorm. (%)
1000
80
1st line
2nd line
2nd line
Rated Power (%)
100
10
0
10
0
0
25
50 70 100 125 150 170
Ambient Temperature (°C)
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
Revision: 19-Jul-2022
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
Upgrade for TCR to Kelvin Termination With WSL2726
WSL3921, WSL5931
www.vishay.com
Vishay Dale
PERFORMANCE
TEST
CONDITIONS OF TEST
TEST LIMITS
Thermal shock
-55 °C to +150 °C, 1000 cycles, 15 min at each extreme
± 1.0 %
Short time overload
Refer to link for short time overload performance and pulse capability;
www.vishay.com/resistors/power-metal-strip-calculator/
± 0.5 %
Low temperature storage
-65 °C for 24 h
± 0.5 %
High temperature exposure
1000 h at +170 °C
± 1.0 %
Bias humidity
+85 °C, 85 % RH, 10 % bias, 1000 h
± 0.5 %
Mechanical shock
100 g’s for 6 ms, 5 pulses
± 0.5 %
Vibration
Frequency varied 10 Hz to 2000 Hz in 1 min, 3 directions, 12 h
± 0.5 %
Load life
1000 h at +70 °C, 1.5 h “ON”, 0.5 h “OFF”
± 1.0 %
Resistance to solder heat
3 x at 250 °C ± 5 °C for 30 s ± 5 s
± 0.5 %
Moisture resistance
MIL-STD-202, method 106, 0 % power, 7a and 7b not required
± 0.5 %
Note
• Contact ww2bresistors@vishay.com for application specific performance requirements. Typical performance is better than stated test limits
PACKAGING
MODEL
REEL
TAPE WIDTH
DIAMETER
PIECES/REEL
CODE
WSL3921
16 mm / embossed plastic
330 mm / 13"
3000
EA
WSL5931
24 mm / embossed plastic
330 mm / 13"
1500
EA
Notes
• Embossed carrier tape per EIA-481
(1) Additional packaging details at www.vishay.com/doc?20051
Revision: 19-Jul-2022
Document Number: 30110
4
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
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE
RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.
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“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other
disclosure relating to any product.
Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or
the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all
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Statements regarding the suitability of products for certain types of applications are based on Vishay's knowledge of typical
requirements that are often placed on Vishay products in generic applications. Such statements are not binding statements
about the suitability of products for a particular application. It is the customer's responsibility to validate that a particular product
with the properties described in the product specification is suitable for use in a particular application. Parameters provided in
datasheets and / or specifications may vary in different applications and performance may vary over time. All operating
parameters, including typical parameters, must be validated for each customer application by the customer's technical experts.
Product specifications do not expand or otherwise modify Vishay's terms and conditions of purchase, including but not limited
to the warranty expressed therein.
Hyperlinks included in this datasheet may direct users to third-party websites. These links are provided as a convenience and
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© 2022 VISHAY INTERTECHNOLOGY, INC. ALL RIGHTS RESERVED
Revision: 01-Jan-2022
1
Document Number: 91000