RSMF3JB510R Equivalent & Substitute Parts

Part Overview

The RSMF3JB510R is a 510 Ohms ±5% 3W through-hole resistor manufactured by Stackpole Electronics Inc. This axial metal oxide film resistor features flame-proof and safety characteristics, designed for applications requiring reliable power dissipation in the 3-watt range. The part maintains Active product status with 764 units in current inventory. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility allow direct replacement in circuit designs.

Substiute Parts

RSMF3JB510R

Stackpole Electronics IncIn Stock: 816RSMF3JB510R Datasheet

Current PartRFQ

SQP500JB-510R

YAGEOIn Stock: 2587SQP500JB-510R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SQP500JB-510R from YAGEO qualifies as a substitute based on the following critical parameters:

• Resistance value: 510 Ohms (identical)
• Tolerance: ±5% (identical)
• Package configuration: Axial (identical mechanical interface)
• Terminations: 2 (identical)
• RoHS compliance: ROHS3 Compliant (identical regulatory status)
• Resistance composition: Both are film-based resistors with flame-proof and safety features

The SQP500JB-510R operates at 5W power rating, which exceeds the 3W requirement of the RSMF3JB510R. This higher power capability allows the substitute to handle equivalent or greater thermal loads. Both parts maintain compliance with ROHS3 and REACH standards.

Parameter Comparison

Engineering Selection Recommendations

Both the RSMF3JB510R and SQP500JB-510R maintain Active product status and ROHS3 compliance. The SQP500JB-510R provides higher power dissipation capacity (5W versus 3W), making it suitable for applications where the original 3W specification is met or where additional thermal margin is beneficial. The substitute maintains identical resistance value and tolerance specifications.

Physical dimensions differ between the two parts. The SQP500JB-510R is larger in overall length (22.00mm versus 15.00mm) and has a rectangular cross-section compared to the cylindrical profile of the RSMF3JB510R. PCB layout and mechanical clearance must accommodate these dimensional differences.

The operating temperature range of the SQP500JB-510R extends to 155°C maximum, compared to 235°C for the RSMF3JB510R. Applications requiring operation above 155°C must retain the original RSMF3JB510R specification.

Frequently Asked Questions (FAQ)

Q: Can the SQP500JB-510R directly replace the RSMF3JB510R in all applications?

A: Direct electrical replacement is valid for applications operating within the SQP500JB-510R temperature range (-55°C to 155°C) and where PCB layout accommodates the larger physical dimensions. The higher 5W power rating does not create compatibility issues for 3W applications.

Q: What are the key differences between these two resistors?

A: The primary differences are power rating (3W versus 5W), composition (metal oxide film versus cement), physical size, and maximum operating temperature (235°C versus 155°C). Resistance value, tolerance, and package type remain identical.

Q: Are there any compliance or regulatory concerns with substitution?

A: Both parts maintain ROHS3 compliance and REACH Unaffected status. No regulatory barriers exist for substitution within the specified operating parameters.

Q: How do the physical dimensions affect PCB design?

A: The SQP500JB-510R measures 22.00mm in length compared to 15.00mm for the RSMF3JB510R. The rectangular cross-section (9.50mm x 9.00mm) differs from the cylindrical profile (5.50mm diameter). PCB footprint and component spacing must be verified before substitution.

Q: Which part should be selected for high-temperature applications?

A: The RSMF3JB510R supports operation to 235°C and is required for applications exceeding 155°C. The SQP500JB-510R is limited to 155°C maximum operating temperature.