WSHM2818
www.vishay.com Vishay Dale
Revision: 18-Jun-2018 1Document Number: 30188
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
Power Metal Strip® Resistors, High Power (7 W),
Low Value (down to 0.001 ), Surface Mount
DESIGN SUPPORT TOOLS
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-
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
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
Note
(1) The WSHM2818 is rated at 7 W with maximum surface temperature of 180 °C
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
PATENT(S): www.vishay.com/patents
This Vishay product is protected by one or more United States and international patents.
click logo to get started
Available
Models
Available
Design Tools
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL MODEL SIZE
POWER RATING
P70 °C
W
RESISTANCE VALUE RANGE
WEIGHT
(typical)
g/1000 pieces
Tol. ± 0.5 % Tol. ± 1.0 %
WSHM2818 2818 7 (1) 0.010 to 0.1 0.001 to 0.1 167.8
WSHM2818 2818 6 0.101 to 0.2 0.101 to 0.2 167.8
GLOBAL PART NUMBER INFORMATION
Global Part Numbering: WSHM2818R1000FEA (visit www.vishay.net Vishay Dale parts numbering manual for all options)
GLOBAL MODEL RESISTANCE
VALUE TOLERANCE CODE PACKAGING CODE (1) SPECIAL
WSHM2818 L = m*
R = decimal
4L000 = 0.004
R0100 = 0.01
* Use “L” for resistance
values < 0.01
D = ± 0.5 %
F = ± 1.0 %
EA = lead (Pb)-free, tape/reel
EK = lead (Pb)-free, bulk
(dash number)
(up to 2 digits)
from 1 to 99 as
applicable
W S H M 2 8 1 8 R 1 0 0 0 F E A
WSHM2818
www.vishay.com Vishay Dale
Revision: 18-Jun-2018 2Document Number: 30188
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
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)
Notes
• 3D models available: www.vishay.com/doc?30324
• Surface mount solder profile recommendations: www.vishay.com/doc?31052
TYPICAL SENSING LAYOUT SENSING WITH VIA LAYOUT (best performance)
Note
• 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
TECHNICAL SPECIFICATIONS
PARAMETER UNIT RESISTOR CHARACTERISTICS
Component temperature coefficient (including terminal) (1) ppm/°C ± 200 for 1 m to 5.99 m
± 75 for 6 m to 200 m
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
MODEL
RESISTANCE
RANGE
DIMENSIONS SOLDER PAD DIMENSIONS
LWH Tabl
WSHM2818 0.001 to 0.2 0.280 ± 0.010
(7.1 ± 0.25)
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)
L
W
T
H
b
a
a
l
abc l
0.138
(3.51)
0.210
(5.33)
0.020
(0.51)
0.024
(0.61)
l
a
b
c
c
a
abde f l
0.143
(3.63)
0.210
(5.33)
0.026
(0.66)
0.105
(2.67)
Ø 0.020
(0.50)
0.024
(0.61)
f
b
d
a
ae
l
WSHM2818
www.vishay.com Vishay Dale
Revision: 18-Jun-2018 3Document Number: 30188
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
DERATING PULSE CAPABILITY
www.vishay.com/resistors/power-metal-strip-calculator
Notes
• Embossed carrier tape per EIA-481
• Additional packaging details at www.vishay.com/doc?20051
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 %
I
I
L
L
L
L
U
S
T
R
A
T
A
A
I
V
E
P
U
R
R
P
P
O
S
E
E
S
S
O
O
N
L
Y
Y
L
L
LL
click to get started
PERFORMANCE
TEST CONDITIONS OF TEST TEST LIMITS
Thermal shock -55 °C to +150 °C, 1000 cycles, 15 min at each extreme ± 0.5 %
Short time overload 4x rated power for 5 s ± 1.0 %
Low temperature operation -65 °C for 24 h ± 0.5 %
High temperature exposure 1000 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 1000 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 %
PACKAGING
MODEL
REEL
TAPE WIDTH DIAMETER PIECES/REEL CODE
WSHM2818 16 mm/embossed plastic 330 mm / 13" 3500 EA
ADDITIONAL RESOURCES
Video: Power Metal Strip
Short Time Overload www.vishay.com/videos/resistors/power-metal-strip174-resistor-short-time-overload-product-demo
Legal Disclaimer Notice
www.vishay.com Vishay
Revision: 08-Feb-17 1Document Number: 91000
Disclaimer
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE
RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively,
“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other
disclosure relating to any product.
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the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all
liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special,
consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular
purpose, non-infringement and merchantability.
Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of
typical requirements that are often placed on Vishay products in generic applications. Such statements are not binding
statements about the suitability of products for a particular application. It is the customer’s responsibility to validate that a
particular product with the properties described in the product specification is suitable for use in a particular application.
Parameters provided in datasheets and / or specifications may vary in different applications and performance may vary over
time. All operating parameters, including typical parameters, must be validated for each customer application by the customer’s
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including but not limited to the warranty expressed therein.
Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining
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Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for
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No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document
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© 2017 VISHAY INTERTECHNOLOGY, INC. ALL RIGHTS RESERVED
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Vishay:
WSHM2818R0150FEA WSHM2818R0220FEA WSHM2818R1000FEB WSHM28183L000FEA
WSHM2818R0300FEA WSHM2818R0400FEA WSHM2818R0500FEB WSHM28181L000FEA WSHM2818R0330FEB
WSHM2818R0500JEA WSHM2818R0100FEB WSHM28181L000FEB WSHM2818R0680FEA
WSHM2818R0800FEA WSHM28186L000FEA WSHM28189L000FEA WSHM2818R1000FEA WSHM2818R0500FEA
WSHM2818R0770FEA WSHM2818R0100FEA WSHM2818R0200FEB WSHM28185L000FEB
WSHM28188L000FEA WSHM2818R0600FEA WSHM2818R0330FEA WSHM28182L000FEA WSHM2818R0900FEA
WSHM2818R0200FEA WSHM2818R0660FEA WSHM2818R0250FEA WSHM2818R0470FEA
WSHM2818R0250JEA WSHM2818R0820FEA WSHM28185L000FEA WSHM28184L000FEA WSHM28182L500FEA
WSHM2818R0700FEA WSHM28186L800FEA WSHM2818R0680FEB WSHM28182L000FEB
WSHM2818R0800FEB WSHM2818R0150FEB WSHM2818R0470FEB WSHM28184L000FEB WSHM28183L000FEB
WSHM2818R0900FEB WSHM28182L500FEB WSHM2818R0820FEB WSHM28186L800FEB
WSHM2818R0660FEB WSHM28189L000FEB WSHM2818R0400FEB WSHM28186L000FEB WSHM2818R0770FEB
WSHM28188L000FEB WSHM2818R0600FEB WSHM2818R0700FEB WSHM28187L000FEA
