WRF3JB20R0 Equivalent & Substitute Parts

Part Overview

The WRF3JB20R0 is a 20 Ohm, 3W axial wirewound resistor manufactured by Stackpole Electronics Inc. This component is designed for through-hole applications requiring flame-proof and moisture-resistant characteristics with safety-rated construction. The part is currently listed as obsolete, making identification of compatible substitutes essential for ongoing system support and component procurement.

Substiute Parts

WRF3JB20R0

Stackpole Electronics IncIn Stock: 913WRF3JB20R0 Datasheet

Current PartRFQ

CB3JB20R0

Stackpole Electronics IncIn Stock: 871CB3JB20R0 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the WRF3JB20R0 is determined by strict equivalence across the following electrical and mechanical parameters:

• Resistance value: 20 Ohms
• Tolerance: ±5%
• Power rating: 3W
• Composition: Wirewound
• Package configuration: Axial through-hole
• Safety and environmental features: Flame proof, moisture resistant, safety-rated construction
• Regulatory compliance: ROHS3 compliant

The CB3JB20R0 qualifies as a manufacturer-recommended substitute based on matching all critical electrical specifications and maintaining equivalent safety and environmental certifications.

Parameter Comparison

Engineering Selection Recommendations

The CB3JB20R0 is the manufacturer-recommended substitute for the obsolete WRF3JB20R0. Both components are manufactured by Stackpole Electronics Inc and maintain identical electrical specifications and safety certifications. The CB3JB20R0 is currently in active production status, ensuring long-term availability for procurement.

The CB3JB20R0 provides enhanced performance characteristics compared to the original part: an extended operating temperature range to 275°C and a tighter temperature coefficient of ±200ppm/°C versus the WRF3JB20R0's -80/+900ppm/°C specification. Both parts maintain ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements.

Physical dimensions differ between the two parts. The WRF3JB20R0 measures 0.197" diameter by 0.630" length, while the CB3JB20R0 measures 0.315" square by 0.866" length. PCB layout and mounting clearance must be verified before substitution to ensure mechanical compatibility within the target application.

Frequently Asked Questions (FAQ)

Q: Can the CB3JB20R0 directly replace the WRF3JB20R0 in all applications?

A: Electrical substitution is valid based on matching resistance, tolerance, power rating, and safety features. However, physical dimensions differ. Verify that the larger size of the CB3JB20R0 (0.315" square x 0.866" length versus 0.197" diameter x 0.630" length) accommodates available PCB space and mounting clearance in your specific application.

Q: What is the significance of the different temperature coefficients?

A: The CB3JB20R0 has a tighter temperature coefficient specification (±200ppm/°C) compared to the WRF3JB20R0 (-80/+900ppm/°C). This means the CB3JB20R0 maintains more stable resistance values across temperature variations, which may provide improved circuit performance in temperature-sensitive applications.

Q: Why is the WRF3JB20R0 listed as obsolete?

A: The WRF3JB20R0 has been discontinued by the manufacturer. The CB3JB20R0 represents the active production alternative that maintains equivalent electrical and safety specifications.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the WRF3JB20R0 and CB3JB20R0 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What packaging options are available?

A: The WRF3JB20R0 was supplied in standard packaging, while the CB3JB20R0 is available in bulk packaging. Confirm packaging requirements with your procurement specifications.