WSR
Vishay Dale
Power Metal Strip
®
Resistors,
Low Value (down to 0.001
Ω),
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 (down to
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)
•
Compliant to RoHS directive 2002/95/EC
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL
SIZE
POWER RATING
P
70 °C
W
2.0
3.0
(1)
RESISTANCE RANGE
Ω
± 0.5 %
± 1.0 %
0.01 to 1.0
0.001 to 1.0
0.01 to 0.2
0.001 to 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
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
0.005
Ω
to 0.0099
Ω
= ± 110
0.010
Ω
to 1.0
Ω
= ± 75
> 500
> 10
9
- 65 to + 275
(P x
R)
1/2
440
GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBERING: WSR25L000FTA (PREFERRED PART NUMBERING FORMAT)
W
GLOBAL MODEL
WSR2
WSR3
S
R
2
5
L
0
0
0
F
T
A
SPECIAL
(Dash
Number)
(Up to 2 digits)
From
1 to 99
as
applicable
VALUE
L
= mΩ*
R
= Decimal
5L000
= 0.005
Ω
R0100
= 0.01
Ω
* Use “L” for resistance
values
< 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)
HISTORICAL PART NUMBER EXAMPLE: WSR2 0.005
Ω
1
%
R86 (WILL CONTINUE TO BE ACCEPTED)
WSR2
HISTORICAL MODEL
0.005
Ω
RESISTANCE
VALUE
1
%
TOLERANCE CODE
R86
PACKAGING
* Pb containing terminations are not RoHS compliant, exemptions may apply
** Please see document “Vishay Material Category Policy”:
www.vishay.com/doc?99902
www.vishay.com
30
For technical questions, contact:
ww2bresistors@vishay.com
Document Number: 30101
Revision: 01-Jul-09
WSR
Power Metal Strip
®
Resistors,
Low Value (down to 0.001
Ω),
Surface Mount
DIMENSIONS
MODEL
W
H
W1
T
L
I
a
b
Vishay Dale
DIMENSIONS
in inches [millimeters]
L
H
T
0.100 ± 0.010
[2.54 ± 0.254]
W
0.275 ± 0.005
[6.98 ± 0.127]
W
1
0.215 ± 0.005
[5.46 ± 0.127]
0.455 ± 0.032 0.095 ± 0.005
[11.56 ± 0.813] [2.41 ± 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 min at each extreme
WSR2: 5 x rated power for 5 s
WSR3: 4 x rated power for 5 s
- 65 °C for 24 h
1000 h at + 275 °C
+
85
°C,
85 %
RH, 10
%
Bias, 1000 h
100 g’s for 6 ms, 5 pulses
1000 h at rated power, + 70 °C, 1.5 h “ON”, 0.5 h “OFF”
+ 260 °C Solder, 10 s to 12 s dwell, 25 mm/s emergence
TEST LIMITS
WSR2
WSR3
± (0.5
%
+ 0.0005
Ω) ΔR
± (0.5
%
+ 0.0005
Ω) ΔR
± (0.5
%
+ 0.0005
Ω) ΔR
± (2.0
%
+ 0.0005
Ω) ΔR
± (0.5
%
+ 0.0005
Ω) ΔR
± (0.5
%
+ 0.0005
Ω) ΔR
± (1.0
%
+ 0.0005
Ω) ΔR
± (1.0
%
+ 0.0005
Ω) ΔR
± (0.5
%
+ 0.0005
Ω) ΔR
± (0.5
%
+ 0.0005
Ω) ΔR
± (0.5
%
+ 0.0005
Ω) ΔR
± (0.5
%
+ 0.0005
Ω) ΔR
± (1.0
%
+ 0.0005
Ω) ΔR
± (2.0
%
+ 0.0005
Ω) ΔR
± (0.5
%
+ 0.0005
Ω) ΔR
± (0.5
%
+ 0.0005
Ω) ΔR
Frequency varied 10 Hz to 2000 Hz in 1 min, 3 directions, 12 h ± (0.5
%
+ 0.0005
Ω) ΔR
± (0.5
%
+ 0.0005
Ω) ΔR
MIL-STD-202 Method 106, 0
%
power, 7a and 7b not required ± (0.5
%
+ 0.0005
Ω) ΔR
± (0.5
%
+ 0.0005
Ω) ΔR
PACKAGING
MODEL
WSR2 and WSR3
REEL
TAPE WIDTH
24 mm/Embossed Plastic
DIAMETER
330 mm/13"
PIECES/REEL
1500
CODE
EA
Note
• Embossed Carrier Tape per EIA-481-2
Document Number: 30101
Revision: 01-Jul-09
For technical questions, contact:
ww2bresistors@vishay.com
www.vishay.com
31
Legal Disclaimer Notice
Vishay
Disclaimer
All product specifications and data are subject to change without notice.
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf
(collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this
document or by any conduct of Vishay.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless
otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such
applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting
from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding
products designed for such applications.
Product names and markings noted herein may be trademarks of their respective owners.
Document Number: 91000
Revision: 18-Jul-08
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