RSF1JB240R Equivalent & Substitute Parts

Part Overview

The RSF1JB240R is a 240 Ohms ±5% 1W through-hole axial resistor manufactured by Stackpole Electronics Inc. This metal oxide film resistor features flame retardant coating and safety design, operating across -55°C to 235°C. The part is Active status and ROHS3 compliant. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility allow direct replacement in circuit applications.

Substiute Parts

RSF1JB240R

Stackpole Electronics IncIn Stock: 1080RSF1JB240R Datasheet

Current PartRFQ

RSMF2JT240R

Stackpole Electronics IncIn Stock: 15717RSMF2JT240R Datasheet

UpgradeRFQ

RSMF1JT240R

Stackpole Electronics IncIn Stock: 7269RSMF1JT240R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical parameters: resistance value (240 Ohms), tolerance (±5%), composition (metal oxide film), and axial package configuration. Power rating substitution follows this logic:

Direct Equivalent (Same Power Rating): RSMF1JT240R maintains identical 1W power rating with matching electrical specifications. This part is manufacturer-recommended and provides direct functional equivalence.

Upgrade Substitute (Higher Power Rating): RSMF2JT240R provides 2W power rating while maintaining all other electrical parameters. Higher power rating allows operation in applications with greater thermal stress or margin requirements, though physical dimensions remain compatible with axial footprints.

All substitute parts share metal oxide film composition, ±200ppm/°C temperature coefficient, ROHS3 compliance, and axial through-hole termination.

Parameter Comparison

Engineering Selection Recommendations

RSMF1JT240R is the manufacturer-recommended direct equivalent. It maintains identical 1W power rating and electrical characteristics while offering ROHS3 compliance and Active product status. This part is suitable for direct replacement in existing designs without circuit modification.

RSMF2JT240R serves as an upgrade substitute where increased power dissipation capability is required. The 2W rating provides thermal margin in applications subject to elevated ambient temperatures or continuous high-current conditions. Operating temperature range extends to 235°C, matching the original part specification. This substitution is valid for designs where higher power rating does not create thermal or spatial constraints.

All three parts maintain ROHS3 compliance and Active status, ensuring regulatory alignment and supply continuity.

Frequently Asked Questions (FAQ)

Q: Can RSMF1JT240R replace RSF1JB240R directly? A: Yes. RSMF1JT240R is the manufacturer-recommended equivalent with identical resistance, tolerance, power rating, and composition. Both are 1W metal oxide film axial resistors rated for -55°C to 235°C operation.

Q: What is the difference between RSF1JB240R and RSMF1JT240R? A: Both parts share identical electrical specifications (240 Ohms, ±5%, 1W, metal oxide film). RSMF1JT240R is supplied in Cut Tape packaging versus Bulk for RSF1JB240R. RSMF1JT240R features flame-proof design compared to flame-retardant coating on RSF1JB240R.

Q: When should RSMF2JT240R be used instead of the 1W alternatives? A: RSMF2JT240R is selected when circuit analysis indicates power dissipation exceeding 1W, or when thermal margin is required for reliability in high-temperature environments. The 2W rating provides additional safety factor without changing electrical performance at nominal operating conditions.

Q: Are all three parts axial through-hole components? A: Yes. All three parts use axial package configuration with two terminations, suitable for through-hole PCB assembly.

Q: Do all substitute parts meet the same compliance standards? A: Yes. RSF1JB240R, RSMF1JT240R, and RSMF2JT240R are all ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes.