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Wirewound Power Resistor BOURNS W3M39R0J Featuring RoHS Compliance and UL 94V0 Coating for Industrial

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Product Description

Product Overview

The W Series Wirewound Power Resistor is designed for high-power applications, featuring a low thermal resistant ceramic core and E24 resistance values. These RoHS compliant resistors offer a wide power range from 1 to 10 Watts and a coating material that meets UL 94V-0 flammability requirements. They are suitable for use in smart meters, renewable energy systems, industrial equipment, power supplies/chargers, lighting, instruments/gauges, and white goods.

Product Attributes

  • Product Series: W Series
  • Type: Wirewound Power Resistor
  • Core Material: Low thermal resistant ceramic core
  • Lead Wire Material: Tin-plated copper wire
  • Coating Material: Meets UL 94V-0 requirements
  • Compliance: RoHS compliant* (Directive 2015/863)
  • Non-inductive version: Available upon request

Technical Specifications

Specification Details
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
Environmental Characteristics Test Conditions
Short Time Overload 2.5 times rated voltage; R/R(2 % 0.05 ) for 5 seconds.
Solderability 245 3 C for 2.5 0.5 seconds. Over 95 % coverage
Resistance to Solder Heat 260 5 C for 10 1 seconds. R/R(1 % + 0.05 )
Dielectric Strength Test voltage >500 Vrms for >1 minute. Pass
Insulation Resistance Test voltage >500 Vrms for >10 for 1 minute.
Load Life (Humidity) 40 2 C, 90 to 95 %. 1.5 hours ON, 0.5 hours OFF for 1000 hours at rated power. R/R (5 % + 0.05 )
Load Life 70 2 C. 1.5 hours ON, 0.5 hours OFF for 1000 hours at rated power. R/R(5 % + 0.05 )
Packaging Specifications
Model Style Qty. per Box (Pcs.) Min. Order Quantity (Pcs.)
W1M Ammo Pack 1,000 5,000
W2M Ammo Pack 500 2,000
W3M Ammo Pack 500 2,000
W5M Ammo Pack 500 2,000
W7M Bulk in Box 25 / 200 2,000
W9M Bulk in Box 25 / 200 2,000
W10M Bulk in Box 25 / 200 2,000
Popular Resistance Values
Code R Value
15R0 15
22R0 22
33R0 33
39R0 39
47R0 47
56R0 56
82R0 82
1000 100
1200 120
1500 150
Other E24 resistance values available upon request.
How to Order
Format W [Power Rating] [Pin Style] [Resistance Code] [Tolerance]
Example W3M22R0J
Product Series W
Power Rating 1, 2, 3, 5, 7, 9, 10 Watts
Pin Style M = Axial Miniaturized Version
Resistance Code R<100 ohms: R represents decimal point (e.g., 56R0 = 56 ohms). R100 ohms: First three digits are significant, fourth digit represents number of zeros (e.g., 1500 = 150 ohms).
Resistance Tolerance J = 5 %
Product Dimensions (MM/INCHES)
Model L D W T (DIA.)
W1M 9.5 1.0 (.374 .039) 3.0 1.0 (.118 .039) 28.0 3.0 (1.102 .118) 0.54 0.05 (.021 .002)
W2M 11.5 1.0 (.453 .039) 4.5 1.0 (.177 .039) 28.0 3.0 (1.102 .118) 0.70 0.05 (.028 .002)
W3M 15.5 1.0 (.610 .039) 5.5 1.0 (.217 .039) 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 .039) 28.0 3.0 (1.102 .118) 0.75 0.05 (.030 .002)
W7M 24.5 1.0 (.965 .039) 8.5 1.0 (.335 .039) 38.0 3.0 (1.496 .118) 0.75 0.05 (.030 .002)
W9M 39.5 1.0 (1.555 .039) 8.5 1.0 (.335 .039) 38.0 3.0 (1.496 .118) 0.75 0.05 (.030 .002)
W10M 52.5 1.0 (2.067 .039) 8.5 1.0 (.335 .0039 38.0 3.0 (1.496 .118) 0.75 0.05 (.030 .002)
Larger body size available upon request.
Power Derating Curve
The curve shows Percent Rated Load (%) vs. Ambient Temperature (C). Values range from 0% at -55C to 100% at 70C, then derating to 0% at 200C.
Typical Part Marking
Resistors shall be marked with color coding in accordance with JIS C 0802.
Color 1st Band 2nd Band Multiplier Tol.
Black 0 0 1
Brown 1 1 10 1 %
Red 2 2 100 2 %
Orange 3 3 1K
Yellow 4 4 10K
Green 5 5 100K 0.5 %
Blue 6 6 1M 0.25 %
Violet 7 7 10M 0.10 %
Grey 8 8 0.05 %
White 9 9
Gold 0.1 5 %
Silver 0.01 10 %

*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.


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Company Beijing Silk Road Enterprise Management Services Co., Ltd.
Location 16 Floor, Unit B, Jiatai International Mansion, No 41, Dongsihuan Zhong Road, Chaoyang District, Beijing
Contact Person Sellina

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