WSR
Vishay Dale
Power Metal Strip® Resistors,
Low Value (down to 0.001 Ω), Surface Mount
FEATURES
• Molded high temperature encapsulation
Pb-free
• Ideal for all types of current sensing, voltage
Available
division and pulse applications including
switching and linear power supplies,
e2
instruments, power amplifiers
• Proprietary processing technique produces
extremely low resistance values (down to RoHS*
COMPLIANT
0.001 Ω)
• 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)
• Lead (Pb)-free version is RoHS compliant
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL
POWER RATING
P70 °C
W
2.0
3.01)
SIZE
RESISTANCE RANGE
Ω
± 0.5 %
± 1.0 %
0.01 - 1.0
0.001 - 1.0
0.01 - 0.2
0.001 - 0.2
WSR2
4527
WSR3
4527
Note
1. The WSR3 requires a minimum of 1050 sq. mil. circuit traces connecting to the recommended solder pad
• Part Marking: DALE, Model, Value, Tolerance, Date Code
TECHNICAL SPECIFICATIONS
PARAMETER
UNIT
Temperature Coefficient
WSR2 & WSR3
0.005 Ω - 0.0099 Ω = ± 110
0.010 Ω - 1.0 Ω = ± 75
> 500
> 109
- 65/+ 275
(P x R)1/2
440
ppm/°C
Dielectric Withstanding Voltage
Insulation Resistance
Operating Temperature Range
Maximum Working Voltage
Weight/1000 pieces (typical)
VAC
Ω
°C
V
g
GLOBAL PART NUMBER INFORMATION
New Global Part Numbering: WSR25L000FTA (preferred part numbering format)
W
GLOBAL MODEL
WSR2
WSR3
S
R
2
5
L
VALUE
L = Milliohm*
R = Decimal
5L000 = 0.005 Ω
R0100 = 0.01 Ω
* use “L” for resistance
values < 0.01 Ω
0
0
0
TOLERANCE
D = ± 0.5 %
F = ± 1.0 %
J = ± 5.0 %
F
T
A
PACKAGING
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 - 99 as
applicable
Historical Part Number example: WSR2 0.005 Ω 1 % R86 (will continue to be accepted)
WSR2
0.005 Ω
1%
R86
HISTORICAL MODEL
RESISTANCE VALUE
TOLERANCE CODE
PACKAGING
* Pb containing terminations are not RoHS compliant, exemptions may apply
www.vishay.com
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For technical questions, contact: ww2bresistors@vishay.com
Document Number: 30101
Revision: 26-Mar-07
