WSK
Vishay Dale
Power Metal Strip
®
Resistors, Low Value,
Surface Mount, 4 - Terminal
FEATURES
• 4-Terminal design allows for 1% tolerance down to
0.001Ω and 0.5% tolerance down to 0.003Ω
• 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
• All welded construction
• Solid metal Nickel-Chrome or Manganese-Copper alloy
resistive element
• Solderable terminations
• Very low inductance 0.5ηH to 5ηH
• Excellent frequency response
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL
POWER RATING
P
70
°
C
W
±
0.5%
WSK2512
1.0
0.003 – 0.025
RESISTANCE RANGE
Ω
±
1.0%
0.001 – 0.025
• 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
UNIT
ppm/°C
WSK2512
0.001Ω - 0.0029Ω =
±
250
0.003Ω - 0.0049Ω =
±
75
0.005Ω - 0.025Ω =
±
35
- 65 / + 170
(P x R)
1/2
63.6
Operating temperature range
Maximum Working Voltage
Weight/1000 pieces
°C
V
g
GLOBAL PART NUMBER INFORMATION
New Global Part Numbering: WSK25125L000FEA (preferred part numbering format)
W
GLOBAL MODEL
WSK2512
S
K
2
5
1
2
5
L
0
0
0
F
E
A
SPECIAL
(Dash Number)
(up to 2 digits)
From
1-99
as
applicable
RESISTANCE VALUE
L = Milliohm
R = Decimal
5L000
= 0.005Ω
R0100
= 0.01Ω
TOLERANCE
CODE
D
=
±
0.5%
F
=
±
1.0%
PACKAGING
CODE
EA
= Lead Free, Tape/Reel
EK
= Lead Free, Bulk
TA
= Tin/Lead, Tape/Reel (R86)
BA
= Tin/Lead, Bulk (B43)
Historical Part Numbering: WSK2512 0.005
Ω
1%
EA (will continue to be accepted)
WSK2512
HISTORICAL MODEL
0.005
Ω
RESISTANCE VALUE
1%
TOLERANCE
CODE
EA
PACKAGING
www.vishay.com
100
For technical questions, contact ww2bresistors@vishay.com
Document Number: 30108
Revision 11-Aug-04
WSK
Power Metal Strip
®
Resistors, Low Value, Surface Mount,
4 - Terminal
DIMENSIONS
L
W
H
Vishay Dale
B
A
T
b
I
d
c
e
a
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
DIMENSIONS
in inches [millimeters]
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]
0.125
±
0.010
[3.18
±
0.254]
0.125
±
0.010
[3.18
±
0.254]
MODEL
a
WSK2512
0.125 [3.18]
RATED POWER IN %
SOLDER PAD DIMENSIONS
in inches [millimeters]
b
0.130 [3.30]
120
100
80
60
40
20
0
-65 -55
-25
0
25
50
75 100 125 150
170
70
AMBIENT TEMPERATURE
°
C
c
0.030 [0.76]
d
0.020 [0.51]
e
0.055 [1.40]
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 minutes at each extreme
5 x power for 5 seconds
- 65°C for 24 hours
1000 hours at + 170°C
+ 85°C, 85% RH, 10% Bias, 1000 hours
100g’s for 6 milliseconds, 5 pulses
Frequency varied 10 to 2,000Hz in one minute, 3 directions, 12 hours
1,000 hours @ rated power, + 70°C, 1.5 hours “ON”, 0.5 hours “OFF”
+ 260°C Solder, 10 – 12 second dwell, 25mm/second emergence
MIL-STD-202 Method 106, 0% power, 7a and 7b not required
TEST LIMITS
±
(0.5% + 0.0005Ω)∆R
±
(0.5% + 0.0005Ω)∆R
±
(0.5% + 0.0005Ω)∆R
±
(1.0% + 0.0005Ω)∆R
±
(0.5% + 0.0005Ω)∆R
±
(0.5% + 0.0005Ω)∆R
±
(0.5% + 0.0005Ω)∆R
±
(1.0% + 0.0005Ω)∆R
±
(0.5% + 0.0005Ω)∆R
±
(0.5% + 0.0005Ω)∆R
PACKAGING
MODEL
TAPE WIDTH
WSK2512
12mm/Embossed Plastic
Embossed carrier tape per EIA-481-1A
DIAMETER
178mm/7”
REEL
PIECES/REEL
2000
CODE
R86
Document Number: 30108
Revision 11-Aug-04
For technical questions, contact ww2bresistors@vishay.com
www.vishay.com
101
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