Power Metal Strip® Resistors, High Power (5 W)
Low Value (down to 0.001 Ω), Surface Mount
www.vishay.com For technical questions, contact: ww2bresistors@vishay.com Document Number: 30120
28 Revision: 06-Jul-09
WSH2818
Vishay Dale
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 amplifiers
•Proprietary processing technique produces
extremely low resistance values
•All welded construction
•Solid metal Nickel-Chrome or Manganese-Copper alloy
resistive element with low TCR (< 20 ppm/°C)
•Lead (Pb)-free construction
•Very low inductance (< 5 nH)
•Excellent frequency response to 50 MHz
•Low thermal EMF (< 3 µV/°C)
•Compliant to RoHS directive 2002/95/EC
Note
(1) The WSH2818 is rated at 5 W with maximum surface temperature of 200 °C
** Please see document “Vishay Material Category Policy”: www.vishay.com/doc?99902
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL
POWER RATING
P70 °C
W
TOLERANCE
%
RESISTANCE RANGE
Ω
WSH2818 5 (1) 1.0 0.001 to 0.1
TECHNICAL SPECIFICATIONS
PARAMETER UNIT WSH2818
Temperature Coefficient ppm/°C ± 200 for 1 mΩ to 5.99 mΩ
± 75 for 6 mΩ to 100 mΩ
Inductance ηH< 5
Operating Temperature Range °C - 65 to + 170
Maximum Continuous Current A (P/R)1/2
Weight/1000 pieces g 126
GLOBAL PART NUMBER INFORMATION
GLOBAL PART NUMBERING: WSH2818R1000FEA
GLOBAL MODEL RESISTANCE VALUE TOLERANCE CODE PACKAGING CODE SPECIAL
WSH2818 L = mΩ*
R = Decimal
4L000 = 0.004 Ω
R0100 = 0.01 Ω
* Use “L” for resistance
values < 0.01
Ω
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
W81
82H
SR1000FEA
Document Number: 30120 For technical questions, contact: ww2bresistors@vishay.com www.vishay.com
Revision: 06-Jul-09 29
WSH2818
Power Metal Strip® Resistors, High Power (5 W)
Low Value (down to 0.001 Ω), Surface Mount Vishay Dale
DIMENSIONS
Note
• Embossed carrier tape per EIA-481-2
L
W
T
H
b
a
a
c
MODEL
DIMENSIONS in inches [millimeters]
RESISTANCE
RANGE
Ω
LW H T
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]
0.001
to
0.0059
0.280 ±
0.010
[7.1 ± 0.25]
0.180 ±
0.010
[4.6 ± 0.25]
0.045 ±
0.010
[1.143 ± 0.25]
0.125 ±
0.010
[3.18 ± 0.25]
MODEL SOLDER PAD DIMENSIONS in inches [millimeters]
ab C
WSH2818 0.138
[3.5]
0.200
[5.1]
0.024
[0.61]
PERFORMANCE
TEST CONDITIONS OF TEST TEST LIMITS
Thermal Shock - 55 °C to + 150 °C, 1000 cycles, 15 min at each extreme ± 0.5 % ΔR
Short Time Overload 4 x rated power for 5 s ± 1.0 % ΔR
Low Temperature Operation - 65 °C for 45 min ± 0.5 % ΔR
High Temperature Exposure 1000 h at + 170 °C ± 1.0 % ΔR
Bias Humidity + 85 °C, 85 % RH, 10 % Bias, 1000 h ± 0.5 % ΔR
Mechanical Shock 100 g’s for 6 ms, 5 pulses ± 0.5 % ΔR
Vibration Frequency varied 10 Hz to 2000 Hz in 1 min, 3 directions, 12 h ± 0.5 % ΔR
Load Life 1000 h at + 70 °C, 1.5 h “ON”, 0.5 h “OFF” ± 1.0 % ΔR
Resistance to Solder Heat + 260 °C Solder, 10 s to 12 s dwell, 25 mm/s emergence ± 0.5 % ΔR
Moisture Resistance MIL-STD-202, Method 106, 0 % power, 7b not required ± 0.5 % ΔR
PACKAGING
MODEL REEL
TAPE WIDTH DIAMETER PIECES/REEL CODE
WSH2818 16 mm/Embossed Plastic 330 mm/13" 3500 EA
70
Derating
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 %
Document Number: 91000 www.vishay.com
Revision: 18-Jul-08 1
Disclaimer
Legal Disclaimer Notice
Vishay
All product specifications and data are subject to change without notice.
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 herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this
document or by any conduct of Vishay.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless
otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such
applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting
from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding
products designed for such applications.
Product names and markings noted herein may be trademarks of their respective owners.
