Page 1
3
3
D
3D Models
Design Tools
Videos
www.vishay.com
Power Metal Strip® Resistors, High Power (7 W),
Low Value (Down to 0.001 Ω), Surface Mount
FEATURES
• Improved thermal management incorporated
into design
• All welded construction of the Power Metal
Strip resistors are ideal for all types of current
sensing, voltage division, and pulse
applications
• Proprietary processing technique produces
extremely low resistance values
• Sulfur resistance by construction that is
unaffected by high sulfur environments
• Very low inductance (< 5 nH)
• Solid metal nickel-chrome or manganese-
LINKS TO ADDITIONAL RESOURCES
Notes
• Follow link to Overview of Automotive Grade Products for more details: www.vishay.com/doc?49924
(1)
Flame retardance test may not be applicable to some resistor technologies
copper alloy resistive element with low TCR (< 20 ppm/°C)
• Low thermal EMF (< 3 μV/°C)
• AEC-Q200 qualified
(1)
• PATENT(S): www.vishay.com/patents
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
WSHM2818
Vishay Dale
STANDARD ELECTRICAL SPECIFICATIONS
POWER RATING
GLOBAL MODEL SIZE
WSHM2818 2818 7
WSHM2818 2818 6 0.101 to 0.2 0.101 to 0.2 167.8
Note
(1)
The WSHM2818 is rated at 7 W with maximum surface temperature of 180 °C
P
70 °C
W
(1)
RESISTANCE VALUE RANGE
Ω
TOL. ± 0.5 % TOL ± 1.0 %
0.010 to 0.1 0.001 to 0.1 167.8
WEIGHT
(typical)
g/1000 pieces
GLOBAL PART NUMBER INFORMATION
Global Part Numbering: WSHM2818R1000FEA (visit www.vishay.net Vishay Dale parts numbering manual for all options)
W S H M 2 8 1 8 R 1 0 0 0 F E A
GLOBAL MODEL
WSHM2818 L = mΩ*
Notes
• SMD Power Metal Strip Marking (www.vishay.com/doc?30327)
(1)
Packaging code: EB (lead (Pb)-free) and TB (tin / lead) are non-standard packaging codes designating 1000 piece reels. These non-standard
packaging codes are identical to our standard EA (lead (Pb)-free) and TA (tin / lead), except that they have a package quantity of 1000 pieces
RESISTANCE
VALUE
R = decimal
4L000 = 0.004 Ω
R0100 = 0.01 Ω
* Use “L” for resistance
values < 0.01 Ω
TOLERANCE CODE PACKAGING CODE
D = ± 0.5 %
F = ± 1.0 %
EA = lead (Pb)-free, tape / reel (dash number)
PATENT(S): www.vishay.com/patents
This Vishay product is protected by one or more United States and international patents.
Revision: 17-Aug-2022
For technical questions, contact: [email protected]
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
1
(1)
(up to 2 digits)
from 1 to 99 as
Document Number: 30188
SPECIAL
applicable
Page 2
L
W
T
H
b
a
a
l
f
b
d
a
a
e
l
WSHM2818
www.vishay.com
TECHNICAL SPECIFICATIONS
PARAMETER UNIT RESISTOR CHARACTERISTICS
± 250 for 1 mΩ to 1.99 mΩ
Component temperature coefficient (including terminal)
(1)
ppm/°C
± 200 for 2 mΩ to 5.99 mΩ
± 75 for 6 mΩ to 200 mΩ
Element TCR
(2)
ppm/°C < 20
Inductance nH < 5
Operating temperature range °C -65 to +170
Maximum working voltage
(3)
V(P x R)
1/2
Notes
(1)
Component TCR - total TCR that includes the TCR effects of the resistor element and the copper terminal
(2)
Element TCR - only applies to the alloy used for the resistor element; refer to item 1 in the construction illustration on the following page
(3)
Maximum working voltage - the WSHM is not voltage sensitive, but is limited by power / energy dissipation and is also not ESD sensitive
DIMENSIONS in inches (millimeters)
Vishay Dale
Notes
• 3D models available: www.vishay.com/doc?30324
• Surface mount solder profile recommendations: www.vishay.com/doc?31052
MODEL
RANGE
Ω
WSHM2818 0.001 to 0.2
RESISTANCE
LWHTabl
0.280 ± 0.010
(7.1 ± 0.25)
DIMENSIONS SOLDER PAD DIMENSIONS
0.180 ± 0.010
(4.6 ± 0.25)
0.059 ± 0.010
(1.50 ± 0.25)
0.125 ± 0.010
(3.18 ± 0.25)
0.138
(3.5)
0.200
(5.1)
0.024
(0.61)
TYPICAL SENSING LAYOUT SENSING WITH VIA LAYOUT (best performance)
a
a
b
l
c
abc l
Note
0.138
(3.51)
0.210
(5.33)
0.020
(0.51)
• Sensing locations are based on the construction of the part; terminals are wrapped from the outside to underneath. These options place the
sensing location nearest the temperature stable resistance element, which minimizes contact resistance and optimizes TCR
Revision: 17-Aug-2022
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
For technical questions, contact: [email protected]
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
c
abde f l
0.024
(0.61)
0.143
(3.63)
2
0.210
(5.33)
0.026
(0.66)
0.105
(2.67)
Ø 0.020
(0.50)
Document Number: 30188
0.024
(0.61)
Page 3
S
A
V
S
S
click to get started
10
100
1000
10000
0
1
2
3
4
5
6
7
8
-65-45-25-51535557595115135155175
Terminal Derated Power
1st line
2nd line
2nd line
Rated Power (W)
Terminal Temperature (°C)
1 % stability
0.5 % stability
0
7 W rated power for 5 °C/W thermal resistance
6 W rated power for 7.5 °C/W thermal resistance
www.vishay.com
DERATING PULSE CAPABILITY
WSHM2818
Vishay Dale
120
100
80
60
2nd line
40
Rated Power (%)
20
0
-65 -50 -25 0 25 50 100 125 150 170
Axis Title
70
Ambient Temperature (°C)
TERMINAL TEMPERATURE DERATING
10000
1000
100
10
1st line
2nd line
www.vishay.com/resistors/power-metal-strip-calculator
PERFORMANCE
TEST CONDITIONS OF TEST TEST LIMITS
Thermal shock -55 °C to +150 °C, 2000 cycles, 15 min at each extreme ± 0.5 %
Short time overload
Low temperature operation -65 °C for 24 h ± 0.5 %
High temperature exposure 2000 h at +170 °C ± 1.0 %
Bias humidity +85 °C, 85 % RH, 10 % bias, 1000 h ± 0.5 %
Mechanical shock 100 g’s for 6 ms, 5 pulses ± 0.5 %
Vibration Frequency varied 10 Hz to 2000 Hz in 1 min, 3 directions, 12 h ± 0.5 %
Load life 2000 h at 70 °C, 1.5 h “ON”, 0.5 h “OFF” ± 1.0 %
Resistance to solder heat +260 °C solder, 10 s to 12 s dwell, 25 mm/s emergence ± 0.5 %
Moisture resistance MIL-STD-202, method 106, 0 % power, 7b not required ± 0.5 %
Revision: 17-Aug-2022
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
Refer to link for short time overload performance and pulse capability;
www.vishay.com/resistors/power-metal-strip-calculator/
3
For technical questions, contact: [email protected]
± 1.0 %
Document Number: 30188
Page 4
WSHM2818
www.vishay.com
PACKAGING
MODEL
TAPE WIDTH DIAMETER PIECES/REEL CODE
WSHM2818 16 mm/embossed plastic 330 mm / 13" 3500 EA
Notes
• Embossed carrier tape per EIA-481
• Additional packaging details at www.vishay.com/doc?20051
REEL
ADDITIONAL RESOURCES
Video: Power Metal Strip
Short Time Overload
www.vishay.com/videos/resistors/power-metal-strip174-resistor-short-time-overload-product-demo
Vishay Dale
Revision: 17-Aug-2022
For technical questions, contact: [email protected]
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
4
Document Number: 30188
Page 5
Legal Disclaimer Notice
www.vishay.com
Vishay
Disclaimer
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE
RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.
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“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other
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Product specifications do not expand or otherwise modify Vishay's terms and conditions of purchase, including but not limited
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Hyperlinks included in this datasheet may direct users to third-party websites. These links are provided as a convenience and
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Revision: 01-Jan-2023
1
Document Number: 91000
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