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WSR21R000FTA Datasheet, PDF (1/3 Pages) Vishay Siliconix – Power Metal Strip Resistors, Low Value (down to 0.001 ), Surface Mount
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WSR
Vishay Dale
Power Metal Strip® Resistors,
Low Value (down to 0.001 ), Surface Mount
FEATURES
• Molded high temperature encapsulation
• 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 (down to
0.001 )
• All welded construction
• Solid metal nickel-chrome or manganese-
copper alloy resistive element with low TCR
(< 20 ppm/°C)
• Solderable terminations
• Very low inductance 0.5 nH to 5 nH
• Excellent frequency response to 50 MHz
• Low thermal EMF (< 3 μV/°C)
• AEC-Q200 qualified (1)
• Material categorization: For definitions of compliance
please see www.vishay.com/doc?99912
Notes
* Lead (Pb)-containing terminations are not RoHS-compliant.
Exemptions may apply.
(1) Flame retardance test may not be applicable to some resistor
technologies.
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL
WSR2
WSR3
SIZE
4527
4527
POWER RATING
P70 °C
W
2.0
3.0 (2)
RESISTANCE VALUE RANGE

Tol. ± 0.5 %
Tol. ± 1.0 %
0.005 to 1.0
0.001 to 1.0
0.005 to 0.2
0.001 to 0.2
Notes
• Part marking: DALE, model, value, tolerance, date code.
(2) The WSR3 requires a minimum of 1050 sq. mil. circuit traces connecting to the recommended solder pad.
WEIGHT
(typical)
g/1000 pieces
440
440
TECHNICAL SPECIFICATIONS
PARAMETER
UNIT
Temperature coefficient
ppm/°C
Element TCR
Dielectric withstanding voltage
Insulation resistance
Operating temperature range
Maximum working voltage
ppm/°C
VAC

°C
V
WSR2 AND WSR3 RESISTOR CHARACTERISTICS
± 75 for 0.010  to 1.0 ; ± 110 for 0.005  to 0.0099 ;
± 300 for 0.004  to 0.0049 ± 450 for 0.003  to 0.0039 ;
± 600 for 0.002  to 0.0029 ; ± 750 for 0.001  to 0.0019 
< 20
> 500
> 109
- 65 to + 275
(P x R)1/2
GLOBAL PART NUMBER INFORMATION
Global Part Numbering example: WSR25L000FEA
WS R 2 5 L 0 0 0 F E A
GLOBAL MODEL
VALUE
TOLERANCE CODE
WSR2
WSR3
L = m*
R = Decimal
5L000 = 0.005 
R0100 = 0.01 
* Use “L” for resistance
values < 0.01 
D = ± 0.5 %
F = ± 1.0 %
J = ± 5.0 %
Historical Part Numbering example: WSR2 0.005  1 % EA
WSR2
0.005 
HISTORICAL MODEL
RESISTANCE VALUE
PACKAGING CODE
EA = Lead (Pb)-free, tape/reel
EK = Lead (Pb)-free, bulk
TA = Tin/lead, tape/reel (R86)
BA = Tin/lead, bulk (B43)
SPECIAL
(Dash number)
(Up to 2 digits)
From 1 to 99 as
applicable
1%
TOLERANCE CODE
EA
PACKAGING CODE
Revision: 17-Jan-13
1
Document Number: 30101
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