WSK
www.vishay.com
Vishay Dale
Power Metal Strip
®
Resistors,
Low Value (down to 0.0005
),
Surface Mount, 4-Terminal
FEATURES
• 4-Terminal design allows for 1 % tolerance
down to 0.0005
and 0.5 % tolerance down to
0.001
• Ideal for all types of precision 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
0.0005
)
• All welded construction
• Solderable terminations
• Solid metal nickel-chrome or manganese-copper
alloy resistive element with low TCR (< 20 ppm/°C)
• Very low inductance 0.5 nH to 5 nH
• Excellent frequency response to 50 MHz
• Compliant to RoHS Directive 2002/95/EC
• AEC-Q200 qualified available
(1)
Note
(1)
Flame retardance test may not be applicable to some resistor
technologies.
Notes
*
Pb containing terminations are not RoHS compliant, exemptions may apply
**
Please see document “Vishay Material Category Policy”:
www.vishay.com/doc?99902
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL MODEL
WSK2512
SIZE
2512
POWER RATING
P
70 °C
W
1.0
RESISTANCE VALUE RANGE
Tol. ± 0.5 %
Tol. ± 1.0 %
0.001 to 0.025
0.0005 to 0.025
WEIGHT
(typical)
g/1000 pieces
63.6
Note
• Part marking: Value, tolerance; due to resistor size limitations some resistance values will be marked with only the resistance value.
TECHNICAL SPECIFICATIONS
PARAMETER
Temperature coefficient
Operating temperature range
Maximum working voltage
UNIT
ppm/°C
°C
V
RESISTOR CHARACTERISTICS
± 350 for 0.5 m to 0.99 m,
± 250 for 0.001
to 0.0029
,
± 75 for 0.003
to 0.0049
,
± 35 for 0.005
to 0.025
- 65 to + 170
(P x
R)
1/2
GLOBAL PART NUMBER INFORMATION
Global Part Numbering example: WSK25125L000FTA (preferred part numbering format)
W
S
K
2
5
1
2
5
L
0
0
0
F
T
A
SPECIAL
(Dash number)
(up to 2 digits)
From
1 to 99
as
applicable
GLOBAL MODEL
WSK2512
RESISTANCE VALUE
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 %
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: WSK2512 0.005
1 % R86 (will continue to be accepted)
WSK2512
HISTORICAL MODEL
Revision: 09-Nov-11
0.005
RESISTANCE VALUE
1%
TOLERANCE CODE
R86
PACKAGING CODE
Document Number: 30108
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
WSK
www.vishay.com
DIMENSIONS
in inches (millimeters)
L
W
Vishay Dale
H
B
A
T
b
l
d
c
e
a
DIMENSIONS
MODEL
RESISTANCE
RANGE
0.0005 to 0.00099
WSK2512
0.001 to 0.0049
0.005 to 0.025
0.250 ± 0.010
(6.35 ± 0.254)
0.125 ± 0.010
(3.18 ± 0.254)
0.025 ± 0.010
(0.635 ± 0.254)
L
W
H
T
0.105 ± 0.010
[2.66 ± 0.254]
0.087 ± 0.010
(2.21 ± 0.254)
0.047 ± 0.010
(1.19 ± 0.254)
A
B
0.030 ± 0.010 0.020 ± 0.010
(0.762 ± 0.254) (0.508 ± 0.254)
SOLDER PAD DIMENSIONS
MODEL
RESISTANCE
RANGE
0.0005 to 0.0049
0.005 to 0.025
a
0.130 (3.30)
0.090 (2.29)
Rated Power in %
120
100
80
60
40
20
0
- 65 - 55 - 25
0
25
50
75 100 125 150 170
70
Ambient Temperature °C
b
0.130 (3.30)
c
0.030 (0.76)
d
0.020 (0.51)
e
0.055 (1.40)
l
0.065 (1.65)
0.145 (3.68)
WSK2512
Derating
PERFORMANCE
TEST
Thermal shock
Short time overload
Low temperature operation
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
5 x rated power for 5 s
- 65 °C for 24 h
1000 h at + 170 °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
TEST LIMITS
± (0.5 % + 0.0005
) R
± (0.5 % + 0.0005
) R
± (0.5 % + 0.0005
) R
± (1.0 % + 0.0005
) R
± (0.5 % + 0.0005
) R
± (0.5 % + 0.0005
) R
± (0.5 % + 0.0005
) R
± (1.0 % + 0.0005
) R
± (0.5 % + 0.0005
) R
± (0.5 % + 0.0005
) R
PACKAGING
MODEL
WSK2512
Note
• Embossed Carrier Tape per EIA-481.
Revision: 09-Nov-11
Document Number: 30108
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
TAPE WIDTH
12 mm/embossed plastic
REEL
DIAMETER
178 mm/7"
PIECES/REEL
2000
CODE
EA
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.
Material Category Policy
Vishay Intertechnology, Inc. hereby certifies that all its products that are identified as RoHS-Compliant fulfill the
definitions and restrictions defined under Directive 2011/65/EU of The European Parliament and of the Council
of June 8, 2011 on the restriction of the use of certain hazardous substances in electrical and electronic equipment
(EEE) - recast, unless otherwise specified as non-compliant.
Please note that some Vishay documentation may still make reference to RoHS Directive 2002/95/EC. We confirm that
all the products identified as being compliant to Directive 2002/95/EC conform to Directive 2011/65/EU.
Vishay Intertechnology, Inc. hereby certifies that all its products that are identified as Halogen-Free follow Halogen-Free
requirements as per JEDEC JS709A standards. Please note that some Vishay documentation may still make reference
to the IEC 61249-2-21 definition. We confirm that all the products identified as being compliant to IEC 61249-2-21
conform to JEDEC JS709A standards.
Revision: 02-Oct-12
1
Document Number: 91000
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