WRF2JB51R0 Equivalent & Substitute Parts

Part Overview

The WRF2JB51R0 is a 51 Ohm ±5% 2W axial wirewound resistor manufactured by Stackpole Electronics Inc. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design and procurement requirements. The part features flame-proof and moisture-resistant construction suitable for through-hole applications in industrial and safety-critical circuits.

Substiute Parts

WRF2JB51R0

Stackpole Electronics IncIn Stock: 1163WRF2JB51R0 Datasheet

Current PartRFQ

CB2JB5R10

Stackpole Electronics IncIn Stock: 938CB2JB5R10 Datasheet

DirectRFQ

CB3JBR510

Stackpole Electronics IncIn Stock: 1098CB3JBR510 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the WRF2JB51R0 is constrained by the following critical parameters: resistance value (51 Ohms), tolerance (±5%), power rating (2W), composition (wirewound), and package type (axial). The substitute parts listed exhibit variations in resistance value and power rating, which represent functional deviations from the original specification. Selection of any substitute requires confirmation that the circuit design accommodates these parameter differences.

The identified substitutes are:

• CB2JB5R10: 5.1 Ohm, 2W (10× lower resistance)
• CB3JBR510: 510 mOhm, 3W (100× lower resistance, higher power rating)

Both substitutes maintain wirewound composition, axial package configuration, and ±5% tolerance. Both are manufactured by Stackpole Electronics Inc and carry active product status.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts carry active product status and maintain ROHS3 compliance, addressing the obsolescence of the WRF2JB51R0. The CB2JB5R10 and CB3JBR510 extend the upper operating temperature limit to 275°C compared to the original 200°C specification.

Selection between substitutes depends on circuit requirements for resistance value and power dissipation. The CB2JB5R10 maintains the 2W power rating but reduces resistance to 5.1 Ohms. The CB3JBR510 provides increased power handling at 3W with further resistance reduction to 510 mOhms. Both parts retain the flame-proof and moisture-resistant safety features of the original component.

Frequently Asked Questions (FAQ)

Q: Can CB2JB5R10 or CB3JBR510 be used as direct drop-in replacements for WRF2JB51R0?

A: Direct substitution is not possible due to significant resistance value differences. CB2JB5R10 has 10× lower resistance (5.1 Ohms vs. 51 Ohms), and CB3JBR510 has 100× lower resistance (510 mOhms vs. 51 Ohms). Circuit redesign or application-specific evaluation is required.

Q: What are the key differences in operating temperature between the main part and substitutes?

A: The WRF2JB51R0 operates from -55°C to 200°C. Both CB2JB5R10 and CB3JBR510 extend the upper limit to 275°C, providing 75°C additional thermal headroom.

Q: Are all parts in the same physical package?

A: All three parts use axial package configuration. Physical dimensions vary: WRF2JB51R0 is 0.197" Dia × 0.630" L; CB2JB5R10 is 0.252" Square × 0.709" L; CB3JBR510 is 0.315" Square × 0.866" L. PCB layout accommodation may be required.

Q: Do the substitute parts maintain the same safety and compliance certifications?

A: All three parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. All feature flame-proof and moisture-resistant construction. Compliance status is equivalent across all parts.

Q: What is the tolerance specification for all parts?

A: All three parts maintain ±5% tolerance on resistance value, ensuring consistent accuracy across the product family.