WFP
www.vishay.com
Vishay Dale
Power Metal Plate™ Current Sense Resistors,
Low Value (2 mΩ to 8 mΩ), Hybrid Mount, High Power
FEATURES
• 3939 size package with Kelvin terminals
• Ideal for all types of current sensing and pulse
applications including switching and linear
power supplies, instruments, power amplifiers,
Available
shunts, and high power current sensing
modules
• Proprietary processing technique produces low
resistance values (2 mΩ to 8 mΩ)
• Solid metal manganese-copper and nickel- Available
chromium alloy resistive element with low TCR
(< 30 ppm/°C)
• Max. solder temperature up to 280 °C / 30 s or
250 °C / 5 min
Available
• Very low inductance < 10 nH
• Finishes available for wire bonding, sintering, and
soldering (backside);
Electroless Nickel Immersion Gold (ENIG)
• Low thermal EMF (< 2 μV/°C)
• AEC-Q200 qualified
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
LINKS TO ADDITIONAL RESOURCES
3D 3D
3D Models
Note
* 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
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL
SIZE
POWER RATING (1)
W
TOLERANCE
%
RESISTANCE
VALUE RANGE
Ω
WEIGHT
(typical)
g/1000 pieces
WFPA3939
3939
20 at 120 °C
± 1.0, ± 5.0
0.002 to 0.005
437
WFPB3939
3939
20 at 120 °C
± 1.0, ± 5.0
0.0051 to 0.008
437
Note
(1) Terminal temperature
GLOBAL PART NUMBER INFORMATION
Global Part Numbering Example: WFPA39392L000FEA
W
F
P
A
GLOBAL
MODEL
(3 digits)
ELEMENT
MATERIAL
(1 digit)
WFP
A = CuMn
B = NiCrAl
3
9
3
CASE SIZE
(4 digits)
3939
9
2
L
0
0
0
F
E
RESISTANCE
VALUE
(5 digits)
TOLERANCE
CODE
(1 digit)
PACKAGING
CODE (1)
(2 digits)
L = mΩ*
R = decimal
2L000 = 0.002 Ω
R0100 = 0.01 Ω
F = ± 1.0 %
J = ± 5.0 %
EA =
lead (Pb)-free,
tape / reel
EK =
lead (Pb)-free,
bulk
* Use “L” for
resistance
values < 0.01 Ω
A
SPECIAL
(2 digits)
Dash numbers
1 thru 99
as applicable
Notes
• Resistance values available per WSL decade values (www.vishay.com/doc?30117)
(1) Packaging code: EB (lead (Pb)-free) is a non-standard packaging code designating 500 piece reels. This non-standard packaging code is
identical to our standard EA (lead (Pb)-free), except that it has a package quantity of 500 pieces
Revision: 26-Jan-2021
Document Number: 30394
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
WFP
www.vishay.com
Vishay Dale
TECHNICAL SPECIFICATIONS
PARAMETER
UNIT
3939 RESISTOR CHARACTERISTICS
Temperature coefficient (20 °C to 60 °C)
(complete resistor)
ppm/°C
± 75
Temperature coefficient (20 °C to 60 °C)
(only element material)
ppm/°C
± 30
Operating temperature range
°C
-65 to +170
Dielectric withstanding
VAC
100
Maximum working voltage
V
(P x R)1/2
Maximum terminal temperature
°C
120
DIMENSIONS in inches (millimeters)
0.030 (0.75)
0.012 (0.30)
0.099
(2.52)
0.09
(2.29)
0.279 (7.09)
0.122
(3.10)
0.025 (0.64)
0.025 (0.64)
0.053
(1.36)
0.075 (1.90)
0.394 (10.01)
0.410 (10.41)
0.075 (1.90)
0.270 (6.86)
0.270 (6.86)
0.075 (1.90)
0.071 (1.80)
0.071 (1.80)
0.410 (10.41)
0.394 (10.01)
Bond area
Solder pads
Bond connections
Note
• Thermal resistance (°C/W): < 2.5 °C/W
MATERIAL
MIN.
(μm)
MAX.
(μm)
Au
0.05
0.15
Ni
3.1
6.1
Au
0.05
0.15
Ni
3.1
6.1
Backside finish
Top side termination
Revision: 26-Jan-2021
Cu (reference only)
50
Ni (WFMB only)
< 0.01
Document Number: 30394
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
WFP
www.vishay.com
Vishay Dale
DERATING
Axis Title
10000
120
1000
80
1st line
2nd line
2nd line
Rated Power (%)
100
60
100
40
20
10
0
0
20
40
60
80 100 120 140 160 180
Terminal Temperature (°C)
PERFORMANCE
TYPICAL PERFORMANCE
TEST
CONDITIONS OF TEST
TEST LIMITS
ALLOY A
CuMn
ALLOY B
NiCr
Thermal shock
-55 °C to +150 °C, 1000 cycles, 15 min at each extreme
± 0.5 %
± 0.65 %
± 0.1 %
Short time overload
2 x rated power, 5 s
± 0.5 %
± 0.05 %
± 0.05 %
Low temperature storage
-55 °C for 45 min
± 0.1 %
± 0.1 %
± 0.1 %
High temperature exposure
1000 h at +170 °C
± 1.0 %
± 0.6 %
± 0.1 %
Bias humidity
+85 °C, 85 % RH, 10 % power, 1000 h
± 0.5 %
± 0.2 %
± 0.1 %
Mechanical shock
100 g’s for 6 ms, 5 pulses
± 0.2 %
± 0.05 %
± 0.05 %
Vibration
Frequency varied, 10 Hz to 2000 Hz in 1 min,
3 directions, 12 h
± 0.2 %
± 0.05 %
± 0.05 %
Load life
1000 h at 125 °C, 1.5 h “ON”, 0.5 h “OFF”
± 1.0 %
± 0.8 %
± 0.1 %
Resistance to solder heat
MIL-STD-202, method 210, test condition K
± 0.3 %
± 0.2 %
± 0.05 %
Moisture resistance
MIL-STD-202, method 106, 0 % power, 7b not required
± 0.3 %
± 0.05 %
± 0.05 %
PACKAGING
(1)
REEL
MODEL
WFPA3939
WFPB3939
TAPE WIDTH
DIAMETER
PIECES/REEL
CODE
16 mm / embossed plastic
330 mm / 13"
3000
EA
Notes
• Embossed carrier tape per EIA-481
(1) Additional packaging details at www.vishay.com/doc?20051
Revision: 26-Jan-2021
Document Number: 30394
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
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Vishay
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Revision: 09-Jul-2021
1
Document Number: 91000