WSR
www.vishay.com
Vishay Dale
Power Metal Strip Resistors,
Low Value (down to 0.001 ), Surface Mount
FEATURES
Molded high temperature encapsulation
All welded construction of the Power Metal
Strip resistors are ideal for all types of current
sensing, voltage division and pulse Available
applications
Proprietary processing technique produces
extremely low resistance values (down to
Available
0.001 )
Sulfur resistance by construction that is
Available
unaffected by high sulfur environments
Solid metal nickel-chrome or manganese-
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DESIGN SUPPORT TOOLS
Available
copper alloy resistive element with low TCR
(< 20 ppm/C)
Models Design Tools
Very low inductance 0.5 nH to 5 nH
Available Available
Excellent frequency response to 50 MHz
Low thermal EMF (< 3 V/C)
(1)
AEC-Q200 qualified
Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
Notes
This datasheet provides information about parts that are RoHS-compliant and / or parts that are non-RoHS-compliant. For example, parts
with lead (Pb) terminations are not RoHS-compliant. Please see the information / tables in this datasheet for details
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
RESISTANCE VALUE RANGE
POWER RATING WEIGHT
GLOBAL
SIZE P (typical)
70 C
MODEL
W g/1000 pieces
Tol. 0.5 % Tol. 1.0 %
WSR2 4527 2.0 0.005 to 1.0 0.001 to 1.0 440
(1)
WSR3 4527 3.0 0.005 to 0.2 0.001 to 0.2 440
Notes
Part marking: DALE, model, value, tolerance, date code
(1)
The WSR3 requires a minimum of 1050 sq. mil. circuit traces connecting to the recommended solder pad
GLOBAL PART NUMBER INFORMATION
Global Part Numbering example: WSR25L000FEA (visit www.vishay.net Vishay Dale parts numbering manual for all options)
WS R2 5 L 0 0 0 F E A
(1) (2) (3)
GLOBAL MODEL RESISTANCE VALUE TOLERANCE CODE PACKAGING CODE SPECIAL
WSR2 L = m * D = 0.5 % EA = lead (Pb)-free, tape/reel (dash number)
WSR3 R = decimal F = 1.0 % EK = lead (Pb)-free, bulk (up to 2 digits)
5L000 = 0.005 J = 5.0 % from 1 to 99 as
TA = tin/lead, tape/reel (R86)
R0100 = 0.01 applicable
BA = tin/lead, bulk (B43)
* Use L for resistance
values < 0.01
Notes
(1)
WSR Marking (www.vishay.com/doc?30327)
(2)
Packaging code: EB (lead (Pb)-free) and TB (tin / lead) are non-standard packaging codes designating 1000 piece reels. These non-standard
packaging codes are identical to our standard EA (lead (Pb)-free) and TA (tin / lead), except that they have a package quantity of 1000 pieces
(3)
Follow link for customization capabilities: www.vishay.com/doc?48163
Revision: 09-Jan-2019 Document Number: 30101
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
WSR
www.vishay.com
Vishay Dale
TECHNICAL SPECIFICATIONS
PARAMETER UNIT WSR2 AND WSR3 RESISTOR CHARACTERISTICS
75 for 0.010 to 1.0
110 for 0.005 to 0.0099
Temperature coefficient
300 for 0.004 to 0.0049
TCR measured from -55 C to ppm/C
450 for 0.003 to 0.0039
150 C
600 for 0.002 to 0.0029
750 for 0.001 to 0.0019
Element TCR ppm/C < 20
Dielectric withstanding voltage V > 500
AC
9
Insulation resistance > 10
Operating temperature range C -65 to +275
1/2
Maximum working voltage V (P x R)
DIMENSIONS in inches (millimeters)
W H
I b
W
1
T
a
L
Notes
3D models available: www.vishay.com/doc?30336
Surface mount solder profile recommendations: www.vishay.com/doc?31052
DIMENSIONS SOLDER PAD DIMENSIONS
MODEL
LH T W W ab l
1
0.455 0.032
WSR2, 0.095 0.005 0.100 0.010 0.275 0.005 0.215 0.005 0.155 0.230 0.205
(11.56
WSR3 (2.41 0.127) (2.54 0.254) (6.98 0.127) (5.46 0.127) (3.94) (5.84) (5.21)
0.813)
Note
Sensing locations are based on the construction of the part; terminals are wrapped from the outside to underneath. These options place the
sensing location nearest the temperature stable resistance element, which minimizes contact resistance and optimizes TCR
TYPICAL SENSING LAYOUT
a
a
c
b
l
c
abc l
0.155 0.230 0.020 0.205
(3.94) (5.84) (0.51) (5.21)
Revision: 09-Jan-2019 Document Number: 30101
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