WRF3JB47R0 Equivalent & Substitute Parts

Part Overview

The WRF3JB47R0 is a 47 Ohm, 5%, 3W axial wirewound resistor manufactured by Stackpole Electronics Inc. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design support and procurement. The part features flame-proof and moisture-resistant construction suitable for through-hole applications requiring reliable performance across extended temperature ranges.

Substiute Parts

WRF3JB47R0

Stackpole Electronics IncIn Stock: 914WRF3JB47R0 Datasheet

Current PartRFQ

CB3JB20R0

Stackpole Electronics IncIn Stock: 871CB3JB20R0 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the WRF3JB47R0 is constrained by the following critical parameters:

• Resistance Value: Substitute parts must maintain the 47 Ohm specification to preserve circuit function
• Tolerance: ±5% tolerance must be maintained for circuit accuracy requirements
• Power Rating: 3W minimum power dissipation capability is required
• Composition: Wirewound construction is specified for this application
• Package Type: Axial through-hole package is mandatory for board compatibility
• Operating Temperature: Minimum -55°C ~ 225°C range required
• Compliance: ROHS3 compliance and EAR99 classification must be maintained

The identified substitute CB3JB20R0 does not meet the resistance value requirement (20 Ohms vs. 47 Ohms specified) and therefore cannot serve as a direct functional equivalent for this application.

Parameter Comparison

Engineering Selection Recommendations

The CB3JB20R0 cannot be used as a substitute for the WRF3JB47R0 due to the resistance value mismatch. While both components share identical tolerance, power rating, composition, package type, and compliance certifications, the 20 Ohm resistance of the substitute part differs fundamentally from the 47 Ohm specification of the original component. Direct substitution would alter circuit behavior and is not permissible.

For applications requiring a 47 Ohm, 3W axial wirewound resistor, alternative sources from active product lines must be evaluated based on the specified electrical and mechanical parameters outlined in the Key Parameters section.

Frequently Asked Questions (FAQ)

Q: Can CB3JB20R0 replace WRF3JB47R0 in my circuit?

A: No. The CB3JB20R0 has a resistance value of 20 Ohms, while the WRF3JB47R0 is specified at 47 Ohms. Resistance value is a non-negotiable parameter for circuit function and cannot be substituted.

Q: What makes a resistor a valid substitute for the WRF3JB47R0?

A: A valid substitute must maintain 47 Ohm resistance, ±5% tolerance, 3W power rating, wirewound composition, axial package type, and operating temperature range of at least -55°C ~ 225°C. All electrical and mechanical parameters must align with the original specification.

Q: Why is the WRF3JB47R0 listed as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Stackpole Electronics Inc. Existing inventory may be available through authorized distributors, but long-term procurement should transition to active product alternatives meeting the same electrical and mechanical requirements.

Q: Are there compliance differences between WRF3JB47R0 and CB3JB20R0?

A: Both components are ROHS3 compliant, REACH unaffected, and classified as EAR99. Compliance certifications are equivalent between the two parts.

Q: What is the physical size difference between these components?

A: WRF3JB47R0 measures 0.197" Dia x 0.630" L (5.00mm x 16.00mm). CB3JB20R0 measures 0.315" Square x 0.866" L (8.00mm x 22.00mm). Physical dimensions differ and must be verified for board layout compatibility if considering alternative resistor sources.