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
Pb-free
Available
•
Ideal for all types of precision current sensing,
voltage division
and
pulse
applications
including switching and linear power supplies,
e3
instruments, power amplifiers
•
Proprietary processing technique produces
RoHS*
extremely low resistance values (down to 0.001
Ω)
COMPLIANT
•
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
•
Lead (Pb)-free version is RoHS compliant
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL
WSK2512
POWER RATING
P
70 °C
W
1.0
RESISTANCE RANGE
Ω
± 0.5 %
0.003 - 0.025
± 1.0 %
0.001 - 0.025
Note
• Part Marking: DALE, 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
Weight/1000 pieces
UNIT
ppm/°C
°C
V
g
WSK2512
0.001
Ω
- 0.0029
Ω
= ± 250
0.003
Ω
- 0.0049
Ω
= ± 75
0.005
Ω
- 0.025
Ω
= ± 35
- 65 to + 170
(P x
R)
1/2
63.6
GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBERING: 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 - 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: WSK2512 0.005
Ω
1 % R86 (WILL CONTINUE TO BE ACCEPTED)
WSK2512
0.005
Ω
1%
R86
HISTORICAL MODEL
RESISTANCE VALUE
TOLERANCE CODE
PACKAGING
* Pb containing terminations are not RoHS compliant, exemptions may apply
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20
For technical questions, contact: ww2bresistors@vishay.com
Document Number: 30108
Revision: 26-Mar-07
WSK
Power Metal Strip
®
Resistors,
Low Value (down to 0.001
Ω),
Surface Mount, 4-Terminal
DIMENSIONS
L
W
Vishay Dale
H
B
A
T
b
l
d
c
e
a
DIMENSIONS
in inches [millimeters]
MODEL
RESISTANCE
RANGE
Ω
0.001 - 0.0049
WSK2512
0.005 - 0.025
L
0.250 ± 0.010
[6.35 ± 0.254]
0.250 ± 0.010
[6.35 ± 0.254]
W
0.125 ± 0.010
[3.18 ± 0.254]
0.125 ± 0.010
[3.18 ± 0.254]
H
0.025 ± 0.010
[0.635 ± 0.254]
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]
0.030 ± 0.010
[0.762 ± 0.254]
B
0.020 ± 0.010
[0.508 ± 0.254]
0.020 ± 0.010
[0.508 ± 0.254]
MODEL
WSK2512
a
0.125 [3.18]
SOLDER PAD DIMENSIONS
in inches [millimeters]
b
c
d
e
0.130 [3.30]
0.030 [0.76]
0.020 [0.51]
0.055 [1.40]
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
I
0.065 [1.65]
Derating
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
5 x 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 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 - 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-481-1A
Document Number: 30108
Revision: 26-Mar-07
For technical questions, contact: ww2bresistors@vishay.com
www.vishay.com
21
REEL
TAPE WIDTH
12 mm/Embossed Plastic
DIAMETER
178 mm/7"
RIECES/REEL
2000
CODE
R86
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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