RSMF3JB240R Equivalent & Substitute Parts

Part Overview

The RSMF3JB240R is a 240 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 compact form factors. The part is currently active in production with 698 units in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility allow direct replacement in circuit designs.

Substiute Parts

RSMF3JB240R

Stackpole Electronics IncIn Stock: 765RSMF3JB240R Datasheet

Current PartRFQ

SQP500JB-240R

YAGEOIn Stock: 2045SQP500JB-240R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SQP500JB-240R qualifies as a substitute based on the following matching electrical parameters:

• Resistance value: 240 Ohms (identical)
• Tolerance: ±5% (identical)
• Package configuration: Axial (identical)
• Termination count: 2 (identical)
• RoHS compliance: ROHS3 Compliant (identical)
• REACH status: REACH Unaffected (identical)
• ECCN classification: EAR99 (identical)

The SQP500JB-240R exceeds the power rating requirement at 5W versus the 3W specification of the RSMF3JB240R, permitting use in applications where the original 3W rating is sufficient. Both parts maintain the same resistance and tolerance specifications critical for circuit functionality.

Parameter Comparison

Engineering Selection Recommendations

Both the RSMF3JB240R and SQP500JB-240R maintain active product status and full ROHS3 compliance. The SQP500JB-240R provides higher power dissipation capacity at 5W, suitable for applications where thermal margin is beneficial. The RSMF3JB240R operates across a wider temperature range (-55°C to 235°C) compared to the SQP500JB-240R (-55°C to 155°C), making it the preferred choice for high-temperature applications exceeding 155°C. Selection should be based on specific thermal and temperature requirements of the target application.

Frequently Asked Questions (FAQ)

Q: Can the SQP500JB-240R directly replace the RSMF3JB240R in all applications?

A: The SQP500JB-240R matches the critical electrical specifications (240 Ohms, ±5% tolerance) and axial package configuration. However, the operating temperature range differs. The SQP500JB-240R is limited to -55°C ~ 155°C, while the RSMF3JB240R operates to 235°C. Substitution is valid only when the application temperature remains within the SQP500JB-240R's specified range.

Q: What is the difference between metal oxide film and cement composition?

A: Both compositions are suitable for axial resistors with equivalent electrical performance at the specified resistance and tolerance values. Composition differences relate to internal construction and thermal characteristics but do not affect the primary electrical parameters for this substitution.

Q: Does the higher power rating of the SQP500JB-240R affect circuit compatibility?

A: No. A 5W resistor can be used in applications designed for 3W operation. The higher power rating provides additional thermal margin and does not negatively impact circuit function when the actual power dissipation remains within design specifications.

Q: Are there packaging considerations for substitution?

A: The RSMF3JB240R is supplied in bulk packaging while the SQP500JB-240R is supplied in tray packaging. Both maintain identical axial package dimensions and termination configuration, ensuring mechanical compatibility in PCB layouts and through-hole assembly processes.