WSR
www.vishay.com
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 manganesecopper 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
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
POWER RATING
P70 °C
W
2.0
3.0 (2)
SIZE
4527
4527
WEIGHT
(typical)
g/1000 pieces
440
440
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.
TECHNICAL SPECIFICATIONS
PARAMETER
UNIT
Temperature coefficient
ppm/°C
Element TCR
Dielectric withstanding voltage
Insulation resistance
Operating temperature range
Maximum working voltage
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
ppm/°C
VAC
°C
V
GLOBAL PART NUMBER INFORMATION
Global Part Numbering example: WSR25L000FEA
W
S
R
2
5
L
0
0
0
F
E
A
GLOBAL MODEL
VALUE
TOLERANCE CODE
PACKAGING CODE
SPECIAL
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 %
EA = Lead (Pb)-free, tape/reel
EK = Lead (Pb)-free, bulk
(Dash number)
(Up to 2 digits)
From 1 to 99 as
applicable
TA = Tin/lead, tape/reel (R86)
BA = Tin/lead, bulk (B43)
Historical Part Numbering example: WSR2 0.005 1 % EA
WSR2
0.005
1%
EA
HISTORICAL MODEL
RESISTANCE VALUE
TOLERANCE CODE
PACKAGING CODE
Revision: 17-Jan-13
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
