www.vishay.com For technical questions, contact: ww2bresistors@vishay.com Document Number: 30120
430 Revision: 08-Dec-10
WSH2818
Vishay Dale
Power Metal Strip® Resistors, High Power (5 W)
Low Value (down to 0.001 ), Surface Mount
FEATURES
Improved thermal management incorporated
into design
Ideal for all types of current sensing, voltage
division and pulse applications including
switching and linear power supplies,
instruments, power amplifier
Proprietary processing technique produces
extremely low resistance values
All welded construction
Very low inductance (< 5 nH)
Solid metal nickel-chrome or manganese-copper alloy
resistive element with low TCR (< 20 ppm/°C)
Excellent frequency response to 50 MHz
Low thermal EMF (< 3 μV/°C)
AEC-Q200 qualified (1)
Compliant to RoHS Directive 2002/95/EC
Note
(1) Flame retardance test may not be applicable to some resistor
technologies.
Note
(2) The WSH2818 is rated at 5 W with maximum surface temperature of 200 °C.
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL MODEL SIZE
POWER RATING
P70 °C
W
TOLERANCE
± %
RESISTANCE
VALUE RANGE
WEIGHT
(typical)
g/1000 pieces
WSH2818 2818 5 (2) 1.0 0.001 to 0.1 126
TECHNICAL SPECIFICATIONS
PARAMETER UNIT RESISTOR CHARACTERISTICS
Temperature coefficient ppm/°C ± 200 for 1 m to 5.99 m
± 75 for 6 m to 100 m
Inductance nH < 5
Operating temperature range °C - 65 to + 170
Maximum continuous current A (P/R)1/2
GLOBAL PART NUMBER INFORMATION
Global Part Numbering example: WSH2818R1000FEA
GLOBAL MODEL RESISTANCE VALUE TOLERANCE CODE PACKAGING CODE SPECIAL
WSH2818 L = m*
R = Decimal
4L000 = 0.004
R0100 = 0.01
* Use “L” for resistance
values < 0.01
F = ± 1.0 %
J = ± 5.0 %
EA = Lead (Pb)-free, tape/reel
EK = Lead (Pb)-free, bulk
(Dash number)
(up to 2 digits)
From 1 to 99
as applicable
** Please see document “Vishay Material Category Policy”: www.vishay.com/doc?99902
W S H 2 8 1 8 R 1 0 0 0 F E A
Document Number: 30120 For technical questions, contact: ww2bresistors@vishay.com www.vishay.com
Revision: 08-Dec-10 431
WSH2818
Power Metal Strip® Resistors, High Power (5 W)
Low Value (down to 0.001 ), Surface Mount
Vishay Dale
DIMENSIONS in inches (millimeters)
DERATING
Note
Embossed Carrier Tape per EIA-481.
MODEL
RESISTANCE
RANGE
DIMENSIONS SOLDER PAD DIMENSIONS
LWHTabl
WSH2818
0.006 to 0.1 0.280 ± 0.010
(7.1 ± 0.25)
0.180 ± 0.010
(4.6 ± 0.25)
0.032 ± 0.010
(0.813 ± 0.25) 0.125 ± 0.010
(3.18 ± 0.25)
0.138
(3.5)
0.200
(5.1)
0.024
(0.61)
0.001 to 0.0059 0.045 ± 0.010
(1.143 ± 0.25)
PERFORMANCE
TEST CONDITIONS OF TEST TEST LIMITS
Thermal shock - 55 °C to + 150 °C, 1000 cycles, 15 min at each extreme ± 0.5 % R
Short time overload 4 x rated power for 5 s ± 1.0 % R
Low temperature operation - 65 °C for 45 min ± 0.5 % R
High temperature exposure 1000 h at + 170 °C ± 1.0 % R
Bias humidity + 85 °C, 85 % RH, 10 % bias, 1000 h ± 0.5 % R
Mechanical shock 100 g’s for 6 ms, 5 pulses ± 0.5 % R
Vibration Frequency varied 10 Hz to 2000 Hz in 1 min, 3 directions, 12 h ± 0.5 % R
Load life 1000 h at 70 °C, 1.5 h “ON”, 0.5 h “OFF” ± 1.0 % R
Resistance to solder heat + 260 °C solder, 10 s to 12 s dwell, 25 mm/s emergence ± 0.5 % R
Moisture resistance MIL-STD-202, method 106, 0 % power, 7b not required ± 0.5 % R
L
W
T
H
b
a
a
l
70
120
100
80
60
40
20
0
- 65 - 50 - 25 0 25 50 75 100 125 150 170
Ambient Temperature in °C
Rated Power in %
PACKAGING
MODEL REEL
TAPE WIDTH DIAMETER PIECES/REEL CODE
WSH2818 16 mm/embossed plastic 330 mm/13" 3500 EA
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www.vishay.com Vishay
Revision: 12-Mar-12 1Document Number: 91000
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