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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