WSK
Vishay Dale
Power Metal Strip
®
Resistors,
Low Value (down to 0.001
Ω),
Surface Mount, 4-Terminal
FEATURES
• 4-Terminal design allows for 1 % tolerance
down to 0.001
Ω
and 0.5 % tolerance down to
0.003
Ω
• 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
0.001
Ω)
• 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
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL MODEL
WSK2512
SIZE
2512
POWER RATING
P
70 °C
W
1.0
RESISTANCE VALUE RANGE
Ω
Tol. ± 0.5 %
0.001 to 0.025
Tol. ± 1.0 %
0.001 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
± 250 for 0.001
Ω
to 0.0029
Ω,
± 75 for 0.003
Ω
to 0.0049
Ω,
± 35 for 0.005
Ω
to 0.025
Ω
- 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
= mΩ*
R
= Decimal
5L000
= 0.005
Ω
R0100
= 0.01
Ω
* Use “L” for resistance
values < 0.01
Ω
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
Ω
1 % R86 (will continue to be accepted)
WSK2512
HISTORICAL MODEL
0.005
Ω
RESISTANCE VALUE
1%
TOLERANCE CODE
R86
PACKAGING CODE
* 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
392
For technical questions, contact:
ww2bresistors@vishay.com
Document Number: 30108
Revision: 10-Dec-10
WSK
Power Metal Strip
®
Resistors,
Low Value (down to 0.001
Ω),
Surface Mount, 4-Terminal
DIMENSIONS
in inches (millimeters)
L
W
Vishay Dale
H
B
A
T
b
l
d
c
e
a
DIMENSIONS
MODEL
RESISTANCE
RANGE
Ω
0.001 to 0.0049
WSK2512
0.005 to 0.025
L
0.250 ± 0.010
(6.35 ± 0.254)
W
0.125 ± 0.010
(3.18 ± 0.254)
H
0.025 ± 0.010
(0.635 ± 0.254)
T
0.087 ± 0.010
(2.21 ± 0.254)
0.047 ± 0.010
(1.19 ± 0.254)
A
0.030 ± 0.010
(0.762 ± 0.254)
B
0.020 ± 0.010
(0.508 ± 0.254)
SOLDER PAD DIMENSIONS
MODEL
RESISTANCE
RANGE
Ω
0.001 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
Ω) ΔR
± (0.5 % + 0.0005
Ω) ΔR
± (0.5 % + 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
± (1.0 % + 0.0005
Ω) ΔR
± (0.5 % + 0.0005
Ω) ΔR
± (0.5 % + 0.0005
Ω) ΔR
PACKAGING
MODEL
WSK2512
Note
• Embossed Carrier Tape per EIA-481.
Document Number: 30108
Revision: 10-Dec-10
For technical questions, contact:
ww2bresistors@vishay.com
www.vishay.com
393
TAPE WIDTH
12 mm/embossed plastic
REEL
DIAMETER
178 mm/7"
PIECES/REEL
2000
CODE
EA
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.
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.
Document Number: 91000
Revision: 11-Mar-11
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