Features
■ Low thermal resistant ceramic core
■ E24 resistance values
■ RoHS compliant*
■ Wide power range (1~10 W)
■ Coating material meets UL 94V-0
requirements
Applications
■ Smart meters
■ Renewable energy
■ Industrial
■ Power supplies/chargers
■ Lighting
■ Instruments/gauges
■ White goods
W Series Wirewound Power Resistor
*RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.
Specifi cations are subject to change without notice.
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.
Users should verify actual device performance in their specifi c applications.
*RoHS COMPLIANT
Electrical Characteristics
Resistance Range ................................................ See Popular Resistance Values Table
Tolerance ....................................................................................................................5 %
Operating Temperature .........................................................................-55 °C to +200 °C
Temperature Coeffi cient ..............................................................................±300 ppm/°C
Maximum Voltage ....................................................................................................√P*R
Non-inductive version is available upon request.
Physical Characteristics
Resistor .................................................................... Low thermal resistant ceramic core
Lead Wire ......................................................................................Tin-plated copper wire
Coating Material ............................................................... Meets UL 94V-0 requirements
Environmental Characteristics
Test Conditions Specifi cation
Short Time Overload 2.5 times rated voltage ΔR/R≤±(2 % ± 0.05 Ω)
for 5 seconds.
Solderability 245 ±3 °C for 2.5 ±0.5 seconds. Over 95 % coverage
Resistance to 260 ±5 °C for 10 ± 1 seconds. ΔR/R≤±(1 % + 0.05 Ω)
Solder Heat
Dielectric Strength Test voltage >500 Vrms for Pass
>1 minute.
Insulation Resistance Test voltage >500 Vrms for >109 Ω
1 minute.
40 ±2 °C, 90 to 95 %.
Load Life Humidity 1.5 hours ON, 0.5 hours OFF for ΔR/R≤ ±(5 % + 0.05 Ω)
1000 hours at rated power.
70 ±2 °C.
Load Life 1.5 hours ON, 0.5 hours OFF for ΔR/R≤±(5 % + 0.05 Ω)
1000 hours at rated power.
Packaging Specifi cations
Model Style
Qty. per
Box
(Pcs.)
Min.
Order
Quantity
(Pcs.)
W1M
Ammo
Pack 1,000 5,000
W2M
W3M
W5M Ammo
Pack 500 2,000
W7M
W9M Bulk in
Box 25 / 200 2,000
W10M
Popular Resistance Values
Code R Value
15R0 15 Ω
22R0 22 Ω
33R0 33 Ω
39R0 39 Ω
47R0 47 Ω
Code R Value
56R0 56 Ω
82R0 82 Ω
1000 100 Ω
1200 120 Ω
1500 150 Ω
Other E24 resistance values available upon request.
How to Order
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
• R<100 ohms:
“R” represents decimal point
(examples: 56R0 = 56 ohms)
• R≥100 ohms:
First three digits are signifi cant,
fourth digit represents number of
zeros to follow
(example: 1500 = 150 ohms)
Resistance Tolerance
J = ±5 %
Specifi cations are subject to change without notice.
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.
Users should verify actual device performance in their specifi c applications.
W Series Wirewound Power Resistor
Typical Part Marking
DIMENSIONS: MM
(INCHES)
Product Dimensions
WL
D
T (DIA.)
W
Model
Dimensions
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)
0.70 ± 0.05
(.028 ± .002)
W5M 17.5 ± 1.0
(.689 ± .004)
6.5 ± 1.0
(.256 ± .004)
28.0 ± 3.0
(1.102 ± .118)
0.75 ± 0.05
(.030 ± .002)
W7M 24.5 ± 1.0
(.965 ± .004)
8.5 ± 1.0
(.335 ± .004)
38.0 ± 3.0
(1.496 ± .118)
0.75 ± 0.05
(.030 ± .002)
W9M 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)
W10M 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)
1st Significant
Figure
2nd Significant
Figure
Multiplier
Tolerance
Power Derating Curve
0
-55 0 50 70 100 150 200 250 275 300
20
40
Percent Rated Load (%)
Ambient Temperature (°C)
60
80
120
100
Resistors shall be marked with color
coding. Colors shall be in accordance with
JIS C 0802.
* Larger body size available upon request.
Color 1st
Band
2nd
Band
Multi-
plier Tol.
Black 001 Ω
Brown 1 1 10 Ω±1 %
Red 2 2 100 Ω±2 %
Orange 331K Ω
Yellow 4 4 10K Ω
Green 5 5 100K Ω±0.5 %
Blue 661M Ω±0.25 %
Violet 7 7 10M Ω±0.10 %
Grey 8 8 ±0.05 %
White 99
Gold 0.1 Ω±5 %
Silver 0.01 Ω±10 %
3312 - 2 mm SMD Trimming Potentiometer
Specifi cations are subject to change without notice.
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.
Users should verify actual device performance in their specifi c applications.
W Series Wirewound Power Resistor
07/15
Packaging Specifi cations
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.
DIMENSIONS: MM
(INCHES)
O
L1 L2
Z = 1.0
T
6±1
S
t
P
A
C
B
Asia-Pacifi c: Tel: +886-2 2562-4117 • Fax: +886-2 2562-4116
EMEA: Tel: +36 88 520 390 • Fax: +36 88 520 211
The Americas: Tel: +1-951 781-5500 • Fax: +1-951 781-5700
www.bourns.com
For W9M and W10M packaging specifi cations, please contact factory.
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Bourns:
W3M56R0J W9M1500J W7M33R0J W10M22R0J W10M56R0J W2M82R0J W1M1000J W1M15R0J W7M82R0J
W5M56R0J W5M33R0J W3M22R0J W1M33R0J W5M82R0J W2M1200J W2M47R0J W10M47R0J W7M22R0J
W2M33R0J W10M33R0J W3M39R0J W3M1200J W5M1000J W10M1500J W3M33R0J W3M1500J W3M1000J
W10M82R0J W2M22R0J W3M47R0J W9M15R0J W2M39R0J W1M1500J W7M47R0J W3M82R0J W1M56R0J
W3M15R0J W10M39R0J W2M56R0J W5M47R0J W9M1200J W7M1200J W2M1500J W1M39R0J W1M22R0J
W7M39R0J W2M1000J W10M1000J W5M1200J W5M15R0J W5M1500J W9M33R0J W1M47R0J W2M15R0J
W7M1500J W10M1200J W7M56R0J W5M39R0J W10M15R0J W9M39R0J W9M1000J W1M82R0J W7M1000J
W5M22R0J W9M22R0J W7M15R0J W1M1200J W9M47R0J W9M82R0J W9M56R0J
