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 ppmC)
Solderable terminations
Very low inductance 0.5H to 5H
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
P
70C
W
RESISTANCE RANGE
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
0.005
- 0.0099 = 110
0.010
- 1.0 = 75
Dielectric Withstanding Voltage
V
AC
> 500
Insulation Resistance
> 10
9
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 = 0.005
J =
5.0%
TA = Tin/Lead, tape/reel (R86)
From 1-999 as
R0100 = 0.01
BA = Tin/Lead, bulk (B43)
applicable
GLOBAL PART NUMBER INFORMATION
New Global Part Numbering: WSR25L000FEA (preferred part numbering format)
W
S
R
2
5
L
0
0
0
F
E
A
Historical Part Number example: WSR2
0.005
1%
EA (will continue to be accepted)
WSR2
0.005
1%
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]
L
H
T
W
W
1
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]
a
b
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
- 55C to + 150C, 1000 cycles, 15 minutes at each extreme
(0.5% + 0.0005
) R (0.5% + 0.0005) R
Short Time Overload
WSR2: 5 x rated power for 5 sec. WSR3: 4 x rated power for 5 sec. (0.5% + 0.0005
) R (2.0% + 0.0005) R
Low Temperature Storage
- 65C for 24 hours
(0.5% + 0.0005
) R (0.5% + 0.0005) R
High Temperature Exposure
1000 hours @ + 275C
(1.0% + 0.0005
) R (1.0% + 0.0005) R
Bias Humidity
+ 85C, 85% RH, 10% Bias, 1000 hours
(0.5% + 0.0005
) R (0.5% + 0.0005) R
Mechanical Shock
100g's for 6 milliseconds, 5 pulses
(0.5% + 0.0005
) R (0.5% + 0.0005) R
Vibration
Frequency varied 10 to 2000Hz in one minute, 3 directions, 12 hours
(0.5% + 0.0005
) R (0.5% + 0.0005) R
Load Life
1000 hours @ rated power, + 70C, 1.5 hours "ON", 0.5 hours "OFF"
(1.0% + 0.0005
) R (2.0% + 0.0005) R
Resistance to Solder Heat
+ 260C Solder, 10 -12 second dwell, 25mm/second emergence
(0.5% + 0.0005
) R (0.5% + 0.0005) R
Moisture Resistance
MIL-STD-202 Method 106, 0% power, 7a and 7b not required
(0.5% + 0.0005
) R (0.5% + 0.0005) 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
indemnify Vishay for any damages resulting from such improper use or sale.
PDF 
ZIP