RNF14FTC40R2 Equivalent & Substitute Parts

Part Overview

The RNF14FTC40R2 is a 40.2 Ohm ±1% metal film axial through-hole resistor rated at 0.25W (1/4W) manufactured by Stackpole Electronics Inc. This component features flame retardant coating and safety-grade construction with an operating temperature range of -55°C to 155°C. The part is Active status and RoHS3 compliant. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility allow direct replacement or functional upgrade in circuit applications.

Substiute Parts

RNF14FTC40R2

Stackpole Electronics IncIn Stock: 1162RNF14FTC40R2 Datasheet

Current PartRFQ

CMF5540R200FHEB

Vishay DaleIn Stock: 9353CMF5540R200FHEB Datasheet

UpgradeRFQ

CMF5040R200FHEB

Vishay DaleIn Stock: 3520CMF5040R200FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14FTC40R2 are qualified based on the following criteria:

Electrical Equivalence: Resistance value (40.2 Ohms) and tolerance (±1%) must be identical. Temperature coefficient (±50ppm/°C) must match.

Mechanical Compatibility: Package type must be Axial through-hole configuration to ensure PCB footprint compatibility.

Composition & Features: Metal film construction with flame retardant coating ensures equivalent performance characteristics and safety ratings.

Compliance: RoHS3 compliance and REACH unaffected status must be maintained.

Power Rating Consideration: Substitute parts may have equal or higher power ratings (0.25W or greater) while maintaining all other electrical parameters. Higher power ratings provide operational margin without affecting circuit function.

Two substitute parts meet these criteria: CMF5040R200FHEB (manufacturer-recommended, 1/4W rating) and CMF5540R200FHEB (upgrade option, 1/2W rating).

Parameter Comparison

Engineering Selection Recommendations

CMF5040R200FHEB (Manufacturer-Recommended Substitute): This part provides direct electrical and mechanical equivalence to the RNF14FTC40R2 with identical 0.25W power rating and matching tolerance specifications. The extended operating temperature range (-55°C to 175°C) provides additional thermal margin. Moisture-resistant construction enhances reliability in humid environments. RoHS3 compliance and REACH unaffected status maintain regulatory alignment. This substitute is the primary choice for direct replacement applications.

CMF5540R200FHEB (Upgrade Substitute): This part maintains all electrical specifications while providing doubled power rating (0.5W vs. 0.25W). The upgrade is suitable for applications where thermal margin or component stress reduction is beneficial. Extended operating temperature range and moisture-resistant features provide enhanced performance characteristics. RoHS3 compliance is maintained. Physical dimensions are slightly smaller, which may affect PCB layout considerations.

Both substitute parts are Active status components with established supply availability.

Frequently Asked Questions (FAQ)

Q: Can CMF5040R200FHEB replace RNF14FTC40R2 in all applications? A: Yes. CMF5040R200FHEB provides identical electrical specifications (40.2 Ohms ±1%, 0.25W, ±50ppm/°C) and axial package compatibility. The extended temperature range and moisture-resistant features provide equivalent or improved performance.

Q: What is the advantage of using CMF5540R200FHEB over CMF5040R200FHEB? A: CMF5540R200FHEB provides doubled power rating (0.5W vs. 0.25W) while maintaining all other electrical parameters. This upgrade reduces component thermal stress and provides operational margin in power-dissipation-sensitive circuits. Physical dimensions are slightly smaller (0.090" Dia x 0.240" L vs. 0.065" Dia x 0.150" L).

Q: Are there package compatibility concerns with substitute parts? A: All three parts use axial through-hole package configuration. Physical dimensions vary slightly between the main part and substitutes. Verify PCB hole spacing and component clearance before substitution, particularly when using the smaller CMF5040R200FHEB.

Q: Do substitute parts maintain RoHS3 compliance? A: Yes. Both CMF5040R200FHEB and CMF5540R200FHEB are RoHS3 compliant and REACH unaffected, matching the compliance status of RNF14FTC40R2.

Q: What is the difference between Tape & Reel and Cut Tape packaging? A: RNF14FTC40R2 is supplied in Tape & Reel (TR) format for automated assembly. Substitute parts are supplied in Cut Tape (CT) format, suitable for manual or semi-automated assembly. Packaging format does not affect component electrical or mechanical performance.

Q: Can these parts be used interchangeably in high-temperature applications? A: CMF5040R200FHEB and CMF5540R200FHEB support operating temperatures to 175°C, exceeding the RNF14FTC40R2 specification of 155°C. Both substitutes are suitable for extended temperature applications within their rated range.