WSR
www.vishay.com
Vishay Dale
Power Metal Strip
®
Resistors,
Low Value (down to 0.001
),
Surface Mount
FEATURES
• Molded high temperature encapsulation
• All welded construction of the Power Metal
Strip
®
resistors are ideal for all types of current
sensing,
voltage
division
and
pulse
applications
Available
• Proprietary processing technique produces
extremely low resistance values (down to
0.001
)
• Sulfur resistance by construction that is
unaffected by high sulfur environments
• Solid metal nickel-chrome or manganese-
copper alloy resistive element with low TCR
Available
(< 20 ppm/°C)
• Very low inductance 0.5 nH to 5 nH
• Excellent frequency response to 50 MHz
Available
• Low thermal EMF (< 3 μV/°C)
• AEC-Q200 qualified
(1)
• Material categorization: for definitions of compliance
please see
www.vishay.com/doc?99912
DESIGN SUPPORT TOOLS
Models
Available
Design Tools
click logo to get started
Available
Notes
• This datasheet provides information about parts that are RoHS-compliant and / or parts that are non-RoHS-compliant. For example, parts
with lead (Pb) terminations are not RoHS-compliant. Please see the information / tables in this datasheet for details
• Follow link to Overview of Automotive Grade Products for more details:
www.vishay.com/doc?49924
(1)
Flame retardance test may not be applicable to some resistor technologies
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL
SIZE
POWER RATING
P
70 °C
W
2.0
3.0
(1)
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
WSR2
4527
WSR3
4527
Notes
• Part marking: DALE, model, value, tolerance, date code
(1)
The WSR3 requires a minimum of 1050 sq. mil. circuit traces connecting to the recommended solder pad
TECHNICAL SPECIFICATIONS
PARAMETER
Temperature coefficient
Element TCR
Dielectric withstanding voltage
Insulation resistance
Operating temperature range
Maximum working voltage
UNIT
ppm/°C
ppm/°C
V
AC
°C
V
WSR2 AND WSR3 RESISTOR CHARACTERISTICS
± 75 for 0.010
to 1.0
;
± 110 for 0.005
to 0.0099
;
± 300 for 0.004
to 0.0049
±
450 for 0.003
to 0.0039
;
± 600 for 0.002
to 0.0029
;
± 750 for 0.001
to 0.0019
< 20
> 500
> 10
9
-65 to +275
(P x
R)
1/2
GLOBAL PART NUMBER INFORMATION
Global Part Numbering example: WSR25L000FEA
(visit
www.vishay.net
Vishay Dale parts numbering manual for all options)
W
GLOBAL MODEL
WSR2
WSR3
S
R
2
5
L
0
0
0
F
E
A
SPECIAL
(3)
(dash number)
(up to 2 digits)
from
1
to
99
as
applicable
RESISTANCE VALUE
(1)
L
= m*
R
= decimal
5L000
= 0.005
R0100
= 0.01
* Use “L” for resistance
values < 0.01
TOLERANCE CODE
D
= ± 0.5 %
F
= ± 1.0 %
J
= ± 5.0 %
PACKAGING CODE
(2)
EA
= lead (Pb)-free, tape/reel
EK
= lead (Pb)-free, bulk
TA
= tin/lead, tape/reel (R86)
BA
= tin/lead, bulk (B43)
Notes
(1)
WSR Marking (www.vishay.com/doc?30327)
(2)
Packaging code: EB (lead (Pb)-free) and TB (tin / lead) are non-standard packaging codes designating 1000 piece reels. These non-standard
packaging codes are identical to our standard EA (lead (Pb)-free) and TA (tin / lead), except that they have a package quantity of 1000 pieces
(3)
Follow link for customization capabilities:
www.vishay.com/doc?48163
Revision: 11-Jul-2018
Document Number: 30101
1
For technical questions, contact:
ww2bresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
WSR
www.vishay.com
DIMENSIONS
in inches (millimeters)
H
W1
T
L
Vishay Dale
W
I
a
b
Notes
• 3D models available:
www.vishay.com/doc?30336
• Surface mount solder profile recommendations:
www.vishay.com/doc?31052
DIMENSIONS
MODEL
L
WSR2,
WSR3
0.455 ± 0.032
(11.56 ±
0.813)
H
0.095 ± 0.005
(2.41 ± 0.127)
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)
a
0.155
(3.94)
b
0.230
(5.84)
l
0.205
(5.21)
SOLDER PAD DIMENSIONS
Note
• Sensing locations are based on the construction of the part; terminals are wrapped from the outside to underneath. These options place the
sensing location nearest the temperature stable resistance element, which minimizes contact resistance and optimizes TCR
TYPICAL SENSING LAYOUT
a
a
b
c
l
c
a
0.155
(3.94)
b
0.230
(5.84)
c
0.020
(0.51)
l
0.205
(5.21)
DERATING
Rated Power in %
120
100
80
60
40
20
0
PULSE CAPABILITY
click to get started
S
L
U
IL
- 25
25
75
70
125
175
225
275
Ambient Temperature °C
VE
TI
A
TR
S
S
E
O
RP
PU
Y
NL
O
- 65
www.vishay.com/resistors/power-metal-strip-calculator
Revision: 11-Jul-2018
Document Number: 30101
2
For technical questions, contact:
ww2bresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
WSR
www.vishay.com
Vishay Dale
PERFORMANCE
TEST LIMITS
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
WSR2
-55 °C to +150 °C, 1000 cycles, 15 min at each extreme
WSR2: 5x rated power for 5 s
WSR3: 4x 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
Frequency varied 10 Hz to 2000 Hz in 1 min, 3 directions, 12 h
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
± 0.5 % + 0.0005
± 0.5 % + 0.0005
± 0.5 % + 0.0005
± 1.0 % + 0.0005
± 0.5 % + 0.0005
± 0.5 % + 0.0005
± 0.5 % + 0.0005
± 1.0 % + 0.0005
± 0.5 % + 0.0005
± 0.5 % + 0.0005
WSR3
± 0.5 % + 0.0005
± 2.0 % + 0.0005
± 0.5 % + 0.0005
± 1.0 % + 0.0005
± 0.5 % + 0.0005
± 0.5 % + 0.0005
± 0.5 % + 0.0005
± 2.0 % + 0.0005
± 0.5 % + 0.0005
± 0.5 % + 0.0005
PACKAGING
MODEL
(1)
REEL
TAPE WIDTH
WSR2 and WSR3
24 mm/embossed plastic
DIAMETER
330 mm/13"
PIECES/REEL
1500
CODE
EA
Notes
• Embossed Carrier Tape per EIA-481
(4)
Additional packaging details at
www.vishay.com/doc?20051
Revision: 11-Jul-2018
Document Number: 30101
3
For technical questions, contact:
ww2bresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
Legal Disclaimer Notice
www.vishay.com
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.
Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for
such applications.
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. Product names and markings noted herein may be trademarks of their respective owners.
© 2017 VISHAY INTERTECHNOLOGY, INC. ALL RIGHTS RESERVED
Revision: 08-Feb-17
1
Document Number: 91000
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