WSR
Vishay Dale
Power Metal Strip
®
Resistors,
Low Value (down to 0.001
),
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
)
• 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)
• AEC-Q200 qualified
(1)
• Compliant to RoHS Directive 2002/95/EC
Note
(1)
Flame retardance test may not be applicable to some resistor
technologies.
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL
WSR2
WSR3
SIZE
4527
4527
POWER RATING
P
70 °C
W
2.0
3.0
(2)
RESISTANCE VALUE RANGE
Tol. ± 0.5 %
Tol. ± 1.0 %
0.005 to 1.0
0.001 to 1.0
0.005 to 0.2
0.001 to 0.2
WEIGHT
(typical)
g/1000 pieces
440
440
Notes
• Part marking: DALE, model, value, tolerance, date code.
(2)
The WSR3 requires a minimum of 1050 sq. mil. circuit traces connecting to the recommended solder pad.
TECHNICAL SPECIFICATIONS
PARAMETER
Temperature coefficient
Dielectric withstanding voltage
Insulation resistance
Operating temperature range
Maximum working voltage
UNIT
ppm/°C
V
AC
°C
V
WSR2 AND WSR3
± 110 for 0.005
to 0.0099
± 75 for 0.010
to 1.0
> 500
> 10
9
- 65 to + 275
(P x
R)
1/2
GLOBAL PART NUMBER INFORMATION
Global Part Numbering example: WSR25L000FTA
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
= m*
R
= Decimal
5L000
= 0.005
R0100
= 0.01
* Use “L” for resistance
values < 0.01
WSR2
TOLERANCE CODE
D
= ± 0.5 %
F
= ± 1.0 %
J
= ± 5.0 %
PACKAGING CODE
EA
= Lead (Pb)-free, tape/reel
EK
= Lead (Pb)-free, bulk
TA
= Tin/lead, tape/reel (R86)
BA
= Tin/lead, bulk (B43)
Historical Part Numbering example: WSR2 0.005
1 % R86
0.005
RESISTANCE VALUE
1%
TOLERANCE CODE
R86
PACKAGING CODE
HISTORICAL MODEL
* 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
436
For technical questions, contact:
ww2bresistors@vishay.com
Document Number: 30101
Revision: 26-Jan-11
WSR
Power Metal Strip
®
Resistors,
Low Value (down to 0.001
),
Surface Mount
DIMENSIONS
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)
Vishay Dale
MODEL
W
H
WSR2
WSR3
W1
T
L
I
a
b
MODEL
WSR2
WSR3
SOLDER PAD DIMENSIONS
in inches (millimeters)
a
0.155
(3.94)
b
0.230
(5.84)
l
0.205
(5.21)
DERATING
Rated Power in %
120
100
80
60
40
20
0
- 65
- 25
25
75
70
125
175
225
275
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
TEST LIMITS
WSR2
WSR3
± (0.5 % + 0.0005
) R
± (0.5 % + 0.0005
) R
± (0.5 % + 0.0005
) R
± (2.0 % + 0.0005
) R
± (0.5 % + 0.0005
) R
± (0.5 % + 0.0005
) R
± (1.0 % + 0.0005
) R
± (1.0 % + 0.0005
) R
± (0.5 % + 0.0005
) R
± (0.5 % + 0.0005
) R
± (0.5 % + 0.0005
) R
± (0.5 % + 0.0005
) R
± (1.0 % + 0.0005
) R
± (2.0 % + 0.0005
) R
± (0.5 % + 0.0005
) R
± (0.5 % + 0.0005
) R
± (0.5 % + 0.0005
) R
± (0.5 % + 0.0005
) R
Frequency varied 10 Hz to 2000 Hz in 1 min, 3 directions, 12 h ± (0.5 % + 0.0005
) R
± (0.5 % + 0.0005
) R
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
MIL-STD-202, method 106, 0 % power, 7a and 7b not
required
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.
Document Number: 30101
Revision: 26-Jan-11
For technical questions, contact:
ww2bresistors@vishay.com
www.vishay.com
437
Legal Disclaimer Notice
Vishay
Disclaimer
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE
RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.
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 in any datasheet or in any other
disclosure relating to any product.
Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or
the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all
liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special,
consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular
purpose, non-infringement and merchantability.
Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of typical
requirements that are often placed on Vishay products in generic applications. Such statements are not binding statements
about the suitability of products for a particular application. It is the customer’s responsibility to validate that a particular
product with the properties described in the product specification is suitable for use in a particular application. Parameters
provided in datasheets and/or specifications may vary in different applications and performance may vary over time. All
operating parameters, including typical parameters, must be validated for each customer application by the customer’s
technical experts. Product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase,
including but not limited to the warranty expressed therein.
Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining
applications or for any other application in which the failure of the Vishay product could result in personal injury or death.
Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk and agree
to fully indemnify and hold Vishay and its distributors harmless from and against any and all claims, liabilities, expenses and
damages arising or resulting in connection with such use or sale, including attorneys fees, even if such claim alleges that Vishay
or its distributor was negligent regarding the design or manufacture of the part. Please contact authorized Vishay personnel to
obtain written terms and conditions regarding products designed for such applications.
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Document Number: 91000
Revision: 11-Mar-11
www.vishay.com
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