Power Metal Strip® Resistors,
Low Value, Surface Mount
www.vishay.com For technical questions contact: ww2bresistors@vishay.com Document Number: 30101
214 Revision: 30-Sep-05
WSR
Vishay Dale
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
•All welded construction
•
Solid metal Nickel-chrome or Manganese-copper alloy
resistive element with low TCR (< 20 ppm°C)
•Solderable terminations
•Very low inductance 0.5ηH to 5ηH
•Excellent frequency response
•Low thermal EMF
•Lead (Pb)-Free version is RoHS Compliant
*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
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL
SIZE POWER RATING
P70°C
W
RESISTANCE RANGE
Ω
± 0.5% ± 1.0%
WSR2 4527 2.0 0.01 - 1.0 0.001 - 1.0
WSR3 4527 3.0* 0.01 - 0.2 0.001 - 0.2
TECHNICAL SPECIFICATIONS
PARAMETER UNIT WSR2 & WSR3
Temperature Coefficient ppm/°C 0.005Ω - 0.0099Ω = ± 110
0.010Ω - 1.0Ω = ± 75
Dielectric Withstanding Voltage VAC > 500
Insulation Resistance Ω> 109
Operating Temperature Range °C - 65/+ 275
Maximum Working Voltage V (P x R)1/2
Weight/1000 pieces (typical) g 440
* Pb containing terminations are not RoHS compliant, exemptions may apply
GLOBAL MODEL VALUE TOLERANCE PACKAGING SPECIAL
WSR2 L = Miliohm D = ± 0.5% EA = Lead Free, tape/reel (Dash Number)
R = Decimal F = ± 1.0% EK = Lead Free, Bulk (up to 3 digits)
5L000 = 0.005ΩJ = ± 5.0% TA = Tin/Lead, tape/reel (R86) From 1-999 as
R0100 = 0.01ΩBA = Tin/Lead, bulk (B43) applicable
GLOBAL PART NUMBER INFORMATION
New Global Part Numbering: WSR25L000FEA (preferred part numbering format)
WSR2 5 L 0 00 F E A
Historical Part Number example: WSR2 0.005Ω1% EA (will continue to be accepted)
WSR2 0.005Ω1% EA
HISTORICAL MODEL RESISTANCE VALUE TOLERANCE CODE PACKAGING
Available
Pb-free
RoHS*
COMPLIANT
e2
WSR
Vishay Dale
Power Metal Strip® Resistors,
Low Value, Surface Mount
Document Number: 30101 For technical questions contact: ww2bresistors@vishay.com www.vishay.com
Revision: 30-Sep-05 215
DIMENSIONS
W
L
T
W1
H
I
a
b
MODEL DIMENSIONS in inches [millimeters]
LHTW
W1
WSR2
WSR3
0.455 ± 0.032
[11.56 ± 0.813]
0.095 ± 0.005
[2.41 ± 0.127]
0.100 ± 0.010
[2.54 ± 0.254]
0.275 ± 0.005
[6.98 ± 0.127]
0.215 ± 0.005
[5.46 ± 0.127]
MODEL SOLDER PAD DIMENSIONS in inches [millimeters]
ab l
WSR2
WSR3
0.155
[3.94]
0.230
[5.84]
0.205
[5.21]
Embossed Carrier Tape per EIA-481-2.
PERFORMANCE
TEST CONDITIONS OF TEST TEST LIMITS
WSR2 WSR3
Thermal Shock - 55°C to + 150°C, 1000 cycles, 15 minutes at each extreme
± (0.5% + 0.0005Ω) ∆R ± (0.5% + 0.0005Ω) ∆R
Short Time Overload WSR2: 5 x rated power for 5 sec. WSR3: 4 x rated power for 5 sec.
± (0.5% + 0.0005Ω) ∆R ± (2.0% + 0.0005Ω) ∆R
Low Temperature Storage - 65°C for 24 hours
± (0.5% + 0.0005Ω) ∆R ± (0.5% + 0.0005Ω) ∆R
High Temperature Exposure 1000 hours @ + 275°C
± (1.0% + 0.0005Ω) ∆R ± (1.0% + 0.0005Ω) ∆R
Bias Humidity + 85°C, 85% RH, 10% Bias, 1000 hours
± (0.5% + 0.0005Ω) ∆R ± (0.5% + 0.0005Ω) ∆R
Mechanical Shock 100g’s for 6 milliseconds, 5 pulses
± (0.5% + 0.0005Ω) ∆R ± (0.5% + 0.0005Ω) ∆R
Vibration Frequency varied 10 to 2000Hz in one minute, 3 directions, 12 hours
± (0.5% + 0.0005Ω) ∆R ± (0.5% + 0.0005Ω) ∆R
Load Life 1000 hours @ rated power, + 70°C, 1.5 hours “ON”, 0.5 hours “OFF”
± (1.0% + 0.0005Ω) ∆R ± (2.0% + 0.0005Ω) ∆R
Resistance to Solder Heat + 260°C Solder, 10 -12 second dwell, 25mm/second emergence
± (0.5% + 0.0005Ω) ∆R ± (0.5% + 0.0005Ω) ∆R
Moisture Resistance MIL-STD-202 Method 106, 0% power, 7a and 7b not required
± (0.5% + 0.0005Ω) ∆R ± (0.5% + 0.0005Ω) ∆R
PACKAGING
MODEL REEL
TAPE WIDTH DIAMETER PIECES/REEL CODE
WSR2 & WSR3 24mm/Embossed Plastic 330mm/13" 1500 EA
Derating
-65 -25 25 75 125 175 225 275
Ambient Temperature °C
70
0
20
40
60
80
100
120
Rated Power in %
Legal Disclaimer Notice
Vishay
Document Number: 91000 www.vishay.com
Revision: 08-Apr-05 1
Notice
Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc.,
or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, by
estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's
terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express
or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness
for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.
Customers using or selling these products for use in such applications do so at their own risk and agree to fully
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