RNF14FTC140R Equivalent & Substitute Parts

Part Overview

The RNF14FTC140R is a 140 Ohm ±1% 0.25W (1/4W) through-hole axial resistor manufactured by Stackpole Electronics Inc. This metal film resistor features flame retardant coating and safety construction, designed for general-purpose electronic applications requiring precision resistance values with tight tolerance specifications. The part is currently in active production status with 962 units available in inventory. Substitute parts may be required due to supply constraints, packaging format preferences, or design upgrades that benefit from enhanced thermal or environmental performance characteristics.

Substiute Parts

RNF14FTC140R

Stackpole Electronics IncIn Stock: 1016RNF14FTC140R Datasheet

Current PartRFQ

CMF55140R00FHEB

Vishay DaleIn Stock: 1782CMF55140R00FHEB Datasheet

UpgradeRFQ

CMF50140R00FHEB

Vishay DaleIn Stock: 1984CMF50140R00FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF14FTC140R is determined by the following core parameters: resistance value (140 Ohms), tolerance (±1%), composition (metal film), and package type (axial). The substitute parts listed maintain these critical electrical specifications, ensuring functional equivalence in circuit applications.

The CMF55140R00FHEB and CMF50140R00FHEB, both manufactured by Vishay Dale, meet these substitution criteria. Both parts are metal film axial resistors with 140 Ohm resistance and ±1% tolerance. The primary differences between substitutes relate to power rating and physical dimensions, which are secondary considerations when the primary electrical parameters remain constant.

Parameter Comparison

Engineering Selection Recommendations

The CMF50140R00FHEB represents the direct electrical equivalent to the RNF14FTC140R, maintaining identical resistance, tolerance, power rating, and package type specifications. This part is designated as the manufacturer-recommended substitute and provides the closest functional match for direct replacement applications.

The CMF55140R00FHEB offers an upgrade path with increased power dissipation capability (0.5W versus 0.25W) while maintaining all other critical electrical parameters. This substitute is suitable for applications where thermal margin enhancement is beneficial, though it is not required for circuits designed to the original 0.25W specification.

Both substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory compliance profile of the main part. Both operate across an extended temperature range (-55°C ~ 175°C) compared to the main part (-55°C ~ 155°C), providing additional environmental performance margin.

Frequently Asked Questions (FAQ)

Q: Can CMF50140R00FHEB be used as a direct replacement for RNF14FTC140R?

A: Yes. Both parts share identical electrical specifications: 140 Ohm resistance, ±1% tolerance, 0.25W power rating, metal film composition, and axial package type. The primary difference is packaging format (Cut Tape versus Tape & Reel) and manufacturer.

Q: What is the difference between CMF55140R00FHEB and CMF50140R00FHEB?

A: The CMF55140R00FHEB has a 0.5W power rating compared to the 0.25W rating of CMF50140R00FHEB. All other electrical parameters remain identical. The CMF55140R00FHEB is physically larger due to increased power dissipation capability.

Q: Are the physical dimensions compatible between the main part and substitutes?

A: All three parts use axial package construction. The RNF14FTC140R measures 0.093" Dia x 0.250" L. The CMF55140R00FHEB measures 0.090" Dia x 0.240" L. The CMF50140R00FHEB measures 0.065" Dia x 0.150" L. Verify PCB layout and component spacing accommodate the selected part's dimensions.

Q: Do all parts meet the same regulatory requirements?

A: Yes. The RNF14FTC140R, CMF55140R00FHEB, and CMF50140R00FHEB are all ROHS3 compliant and REACH unaffected.

Q: Which substitute should be selected for new designs?

A: For new designs requiring direct electrical equivalence, select CMF50140R00FHEB. For applications benefiting from increased thermal performance, select CMF55140R00FHEB.