T
PL
IA
N
M
CO
*R
oH
S
Features
Applications
■ Low thermal resistant ceramic core
■ Smart meters
■ E24 resistance values
■ Renewable energy
■ RoHS compliant*
■ Industrial
■ Wide power range (1~10 W)
■ Power supplies/chargers
■ Coating material meets UL 94V-0
■ Lighting
requirements
■ Instruments/gauges
■ White goods
W Series Wirewound Power Resistor
Electrical Characteristics
How to Order
Resistance Range ................................................ See Popular Resistance Values Table
Tolerance ....................................................................................................................5 %
Operating Temperature.........................................................................-55 °C to +200 °C
Temperature Coefficient .............................................................................. ±300 ppm/°C
Maximum Voltage .................................................................................................... √ P * R
Non-inductive version is available upon request.
Popular Resistance Values
Code
R Value
Code
R Value
15R0
15 Ω
56R0
56 Ω
22R0
22 Ω
82R0
82 Ω
33R0
33 Ω
1000
100 Ω
39R0
39 Ω
1200
120 Ω
47R0
47 Ω
1500
150 Ω
Other E24 resistance values available upon request.
Physical Characteristics
Resistor .................................................................... Low thermal resistant ceramic core
Lead Wire ......................................................................................Tin-plated copper wire
Coating Material ............................................................... Meets UL 94V-0 requirements
W 3 M 22R0 J
Product Series
W = Wirewound
Power Rating
1 = 1 Watt
2 = 2 Watts
3 = 3 Watts
5 = 5 Watts
7 = 7 Watts
9 = 9 Watts
10 = 10 Watts
Pin Style
M = Axial Miniaturized Version
Resistance Code
• R500 Vrms for
>1 minute.
Pass
Insulation Resistance
Test voltage >500 Vrms for
1 minute.
>109 Ω
Load Life Humidity
40 ±2 °C, 90 to 95 %.
1.5 hours ON, 0.5 hours OFF for
1000 hours at rated power.
ΔR/R≤ ±(5 % + 0.05 Ω)
Load Life
70 ±2 °C.
1.5 hours ON, 0.5 hours OFF for
1000 hours at rated power.
ΔR/R≤±(5 % + 0.05 Ω)
Style
Qty. per
Box
(Pcs.)
Min.
Order
Quantity
(Pcs.)
Ammo
Pack
1,000
5,000
Ammo
Pack
500
2,000
Bulk in
Box
25 / 200
2,000
W3M
W5M
W7M
W9M
W10M
WARNING Cancer and Reproductive Harm - www.P65Warnings.ca.gov
*RoHS Directive 2015/863, Mar 31, 2015 and Annex.
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
W Series Wirewound Power Resistor
Product Dimensions
Typical Part Marking
W
L
Resistors shall be marked with color
coding. Colors shall be in accordance with
JIS C 0802.
W
D
T (DIA.)
DIMENSIONS:
MM
(INCHES)
1st Significant
Figure
2nd Significant
Figure
Dimensions
Multiplier
Model
L*
D
W
T
W1M
9.5 ± 1.0
(.374 ± .004)
4.0 ± 1.0
(.157 ± .004)
28.0 ± 3.0
(1.102 ± .118)
0.60 ± 0.05
(.024 ± .002)
W2M
11.5 ± 1.0
(.453 ± .004)
4.5 ± 1.0
(.177 ± .004)
28.0 ± 3.0
(1.102 ± .118)
0.65 ± 0.05
(.026 ± .002)
W3M
15.5 ± 1.0
(.610 ± .004)
5.5 ± 1.0
(.217 ± .004)
28.0 ± 3.0
(1.102 ± .118)
W5M
17.5 ± 1.0
(.689 ± .004)
6.5 ± 1.0
(.256 ± .004)
W7M
24.5 ± 1.0
(.965 ± .004)
W9M
W10M
Tolerance
1st
Band
2nd
Band
Multiplier
Black
0
0
1Ω
0.70 ± 0.05
(.028 ± .002)
Brown
1
1
10 Ω
±1 %
Red
2
2
100 Ω
±2 %
28.0 ± 3.0
(1.102 ± .118)
0.75 ± 0.05
(.030 ± .002)
Orange
3
3
1K Ω
Yellow
4
4
10K Ω
8.5 ± 1.0
(.335 ± .004)
38.0 ± 3.0
(1.496 ± .118)
0.75 ± 0.05
(.030 ± .002)
Green
5
5
100K Ω
±0.5 %
Blue
6
6
1M Ω
±0.25 %
39.5 ± 1.0
(1.555 ± .004)
8.5 ± 1.0
(.335 ± .004)
38.0 ± 3.0
(1.496 ± .118)
0.75 ± 0.05
(.030 ± .002)
Violet
7
7
10M Ω
Grey
8
8
52.5 ± 1.0
(2.067 ± .004)
8.5 ± 1.0
(.335 ± .004)
38.0 ± 3.0
(1.496 ± .118)
0.75 ± 0.05
(.030 ± .002)
White
9
9
Color
Tol.
±0.10 %
±0.05 %
Gold
0.1 Ω
±5 %
Silver
0.01 Ω
±10 %
* Larger body size available upon request.
Power Derating Curve
Percent Rated Load (%)
120
100
80
60
40
20
0
-55
0
50 70 100
150
200
250 275 300
Ambient Temperature (°C)
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
W Series Wirewound Power Resistor
Packaging Specifications
O
C
T
6±1
P
B
Z = 1.0
DIMENSIONS:
MM
(INCHES)
t
A
S
L1
L2
Model
O
P
A
B
C
Qty./Box
W1M
58 ± 1
(2.283 ± .039)
5 ± 0.3
(.197 ± .012)
75 ± 5
(2.953 ± .197)
70 ± 5
(2.756 ± .197)
255 ± 5
(10.039 ± .197)
1,000 pcs.
W2M
58 ± 1
(2.283 ± .039)
10 ± 0.5
(.394 ± .020)
80 ± 5
(3.150 ± .197)
82 ± 5
(3.228 ± .197)
255 ± 5
(10.039 ± .197)
1,000 pcs.
W3M
65 ± 5
(2.559 ± .197)
10 ± 0.5
(.394 ± .020)
90 ± 5
(3.543 ± .197)
119 ± 5
(4.685 ± .197)
255 ± 5
(10.039 ± .197)
1,000 pcs.
W5M
65 ± 5
(2.559 ± .197)
10 ± 0.5
(.394 ± .020)
90 ± 5
(3.543 ± .197)
88 ± 5
(3.465 ± .197)
255 ± 5
(10.039 ± .197)
500 pcs.
W7M
90 ± 5
(3.543 ± .197)
10 ± 0.5
(.394 ± .020)
115 ± 5
(4.528 ± .197)
124 ± 5
(4.882 ± .197)
500 ± 5
(19.685 ± .197)
500 pcs.
For W9M and W10M packaging specifications, please contact factory.
Asia-Pacific: Tel: +886-2 2562-4117 • Email: asiacus@bourns.com
EMEA: Tel: +36 88 885 877 • Email: eurocus@bourns.com
The Americas: Tel: +1-951 781-5500 • Email: americus@bourns.com
www.bourns.com
09/19
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
Legal Disclaimer Notice
This legal disclaimer applies to purchasers and users of Bourns® products manufactured by or on behalf of Bourns, Inc. and
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Unless otherwise expressly indicated in writing, Bourns® products and data sheets relating thereto are subject to change
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