WSR
Vishay Dale
Power Metal Strip
®
Resistors,
Low Value, 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
•
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
Pb-free
Available
e2
RoHS*
COMPLIANT
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL
WSR2
WSR3
SIZE
POWER RATING
P
70°C
W
2.0
3.0*
RESISTANCE RANGE
Ω
± 0.5%
0.01 - 1.0
0.01 - 0.2
± 1.0%
0.001 - 1.0
0.001 - 0.2
4527
4527
*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
Temperature Coefficient
Dielectric Withstanding Voltage
Insulation Resistance
Operating Temperature Range
Maximum Working Voltage
Weight/1000 pieces (typical)
UNIT
ppm/°C
V
AC
Ω
°C
V
g
WSR2 & WSR3
0.005Ω - 0.0099Ω = ± 110
0.010Ω - 1.0Ω = ± 75
> 500
> 10
9
- 65/+ 275
(P x R)
1/2
440
GLOBAL PART NUMBER INFORMATION
New Global Part Numbering: WSR25L000FEA (preferred part numbering format)
W
GLOBAL MODEL
WSR2
S
R
2
5
L
0
0
0
F
E
A
SPECIAL
(Dash Number)
(up to 3 digits)
From
1-999
as
applicable
VALUE
L
= Miliohm
R
= Decimal
5L000
= 0.005Ω
R0100
= 0.01Ω
0.005Ω
TOLERANCE
D
=
±
0.5%
F
=
±
1.0%
J
=
±
5.0%
1%
EA
PACKAGING
EA
= Lead Free, tape/reel
EK
= Lead Free, Bulk
TA
= Tin/Lead, tape/reel (R86)
BA
= Tin/Lead, bulk (B43)
Historical Part Number example: WSR2
(will continue to be accepted)
WSR2
HISTORICAL MODEL
0.005Ω
RESISTANCE VALUE
1%
TOLERANCE CODE
EA
PACKAGING
* Pb containing terminations are not RoHS compliant, exemptions may apply
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214
For technical questions contact: ww2bresistors@vishay.com
Document Number: 30101
Revision: 30-Sep-05
WSR
Power Metal Strip
®
Resistors,
Low Value, Surface Mount
DIMENSIONS
MODEL
W
H
W1
T
L
I
a
b
Vishay Dale
DIMENSIONS
in inches [millimeters]
L
H
T
W
W
1
0.455 ± 0.032 0.095 ± 0.005 0.100 ± 0.010 0.275 ± 0.005 0.215 ± 0.005
[11.56 ± 0.813] [2.41 ± 0.127] [2.54 ± 0.254] [6.98 ± 0.127] [5.46 ± 0.127]
WSR2
WSR3
MODEL
WSR2
WSR3
SOLDER PAD DIMENSIONS
in inches [millimeters]
a
0.155
[3.94]
b
0.230
[5.84]
l
0.205
[5.21]
Rated Power in %
120
100
80
60
40
20
0
-65
-25
25
75
70
125
175
225
275
Derating
Ambient Temperature
°C
PERFORMANCE
TEST
Thermal Shock
Short Time Overload
Low Temperature Storage
High Temperature Exposure
Bias Humidity
Mechanical Shock
Vibration
Load Life
Resistance to Solder Heat
Moisture Resistance
CONDITIONS OF TEST
- 55°C to + 150°C, 1000 cycles, 15 minutes at each extreme
- 65°C for 24 hours
1000 hours @ + 275°C
+ 85°C, 85% RH, 10% Bias, 1000 hours
100g’s for 6 milliseconds, 5 pulses
Frequency varied 10 to 2000Hz in one minute, 3 directions, 12 hours
1000 hours @ rated power, + 70°C, 1.5 hours “ON”, 0.5 hours “OFF”
+ 260°C Solder, 10 -12 second dwell, 25mm/second emergence
MIL-STD-202 Method 106, 0% power, 7a and 7b not required
TEST LIMITS
WSR2
WSR3
± (0.5% + 0.0005Ω)
∆R
± (0.5% + 0.0005Ω)
∆R
± (0.5% + 0.0005Ω)
∆R
± (0.5% + 0.0005Ω)
∆R
± (1.0% + 0.0005Ω)
∆R
± (1.0% + 0.0005Ω)
∆R
± (0.5% + 0.0005Ω)
∆R
± (0.5% + 0.0005Ω)
∆R
± (0.5% + 0.0005Ω)
∆R
± (0.5% + 0.0005Ω)
∆R
± (0.5% + 0.0005Ω)
∆R
± (0.5% + 0.0005Ω)
∆R
± (1.0% + 0.0005Ω)
∆R
± (2.0% + 0.0005Ω)
∆R
± (0.5% + 0.0005Ω)
∆R
± (0.5% + 0.0005Ω)
∆R
± (0.5% + 0.0005Ω)
∆R
± (0.5% + 0.0005Ω)
∆R
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
PACKAGING
MODEL
WSR2 & WSR3
REEL
TAPE WIDTH
24mm/Embossed Plastic
DIAMETER
330mm/13"
PIECES/REEL
1500
CODE
EA
Embossed Carrier Tape per EIA-481-2.
Document Number: 30101
Revision: 30-Sep-05
For technical questions contact: ww2bresistors@vishay.com
www.vishay.com
215
Legal Disclaimer Notice
Vishay
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.
Document Number: 91000
Revision: 08-Apr-05
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