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
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 Ω)
Available
e2
RoHS*
COMPLIANT
• 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
POWER RATING
RESISTANCE RANGE
GLOBAL
MODEL
SIZE
P70 °C
W
2.0
3.0 (1)
Ω
0.ꢀ ꢁ
0.01 - 1.0
0.01 - 0.2
1.0 ꢁ
WSR2
WSR3
4527
4527
0.001 - 1.0
0.001 - 0.2
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
WSR2 & WSR3
0.005 Ω - 0.0099 Ω = 110
0.010 Ω - 1.0 Ω = 75
Temperature Coefficient
ppm/°C
Dielectric Withstanding Voltage
Insulation Resistance
VAC
Ω
> 500
> 109
Operating Temperature Range
Maximum Working Voltage
Weight/1000 pieces (typical)
°C
V
g
- 65 to + 275
(P x R)1/2
440
GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBERING: WSR2ꢀL000FTA (PREFERRED PART NUMBERING FORMAT)
W
S
R
2
ꢀ
L
0
0
0
F
T
A
GLOBAL MODEL
WSR2
VALUE
L = mΩ*
R = Decimal
ꢀL000 = 0.005 Ω
R0100 = 0.01 Ω
TOLERANCE
D = 0.5 %
F = 1.0 %
J = 5.0 %
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
WSR3
* use “L” for resistance
values < 0.01 Ω
HISTORICAL PART NUMBER EXAMPLE: WSR2 0.00ꢀ Ω 1 % R86 (WILL CONTINUE TO BE ACCEPTED)
WSR2
0.00ꢀ 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