RNF14FTC249R Equivalent & Substitute Parts

Part Overview

The RNF14FTC249R is a 249 Ohm ±1% 1/4W axial through-hole 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 in compact form factors. The part is currently active in production with 703 units in stock. Substitute parts may be required due to supply constraints, design upgrades, or application-specific performance requirements.

Substiute Parts

RNF14FTC249R

Stackpole Electronics IncIn Stock: 743RNF14FTC249R Datasheet

Current PartRFQ

CMF55249R00FHEB

Vishay DaleIn Stock: 8328CMF55249R00FHEB Datasheet

UpgradeRFQ

CPF1249R00BEEE6

Vishay DaleIn Stock: 2437CPF1249R00BEEE6 Datasheet

UpgradeRFQ

CMF50249R00FHEB

Vishay DaleIn Stock: 1797CMF50249R00FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14FTC249R are qualified based on the following criteria:

Core Compatibility Requirements:

• Resistance value: 249 Ohms (exact match required)
• Composition: Metal Film (maintains electrical characteristics)
• Package: Axial through-hole (ensures mechanical compatibility)
• Tolerance: ±1% or better (meets or exceeds precision requirements)
• RoHS3 Compliance: All substitutes maintain regulatory compliance

Substitution Categories:

1. Direct Equivalent (CMF50249R00FHEB): Identical power rating (0.25W), tolerance (±1%), and temperature coefficient (±50ppm/°C). Manufacturer-recommended substitute with enhanced moisture resistance.

2. Upgraded Power Rating (CMF55249R00FHEB): Higher power dissipation capability (0.5W vs 0.25W) with identical resistance and tolerance. Suitable for applications requiring thermal margin or higher current handling.

3. Premium Performance (CPF1249R00BEEE6): Enhanced tolerance (±0.1% vs ±1%), higher power rating (1W), superior temperature coefficient (±25ppm/°C vs ±50ppm/°C), and extended operating temperature range (-65°C ~ 230°C vs -55°C ~ 155°C). Applicable for precision and high-temperature applications.

Parameter Comparison

Engineering Selection Recommendations

CMF50249R00FHEB Selection: Choose this substitute when direct replacement is required with identical electrical specifications. This part is manufacturer-recommended and provides enhanced moisture resistance while maintaining the same power rating and tolerance. Suitable for standard applications where the original specification must be preserved.

CMF55249R00FHEB Selection: Select this upgrade when the application circuit can accommodate higher power dissipation or when thermal margin is desired. The doubled power rating (0.5W) provides additional safety factor without changing resistance or tolerance characteristics. Extended operating temperature range (-55°C ~ 175°C) supports broader environmental conditions.

CPF1249R00BEEE6 Selection: Implement this premium substitute in precision measurement circuits, high-temperature environments, or applications requiring superior stability. The tighter tolerance (±0.1%), lower temperature coefficient (±25ppm/°C), and extended temperature range (-65°C ~ 230°C) justify selection for demanding specifications. The 1W power rating provides maximum thermal headroom.

All substitutes maintain ROHS3 compliance and axial through-hole package compatibility, ensuring regulatory adherence and mechanical interchangeability.

Frequently Asked Questions (FAQ)

Q: Can CMF50249R00FHEB be used as a direct drop-in replacement for RNF14FTC249R?

A: Yes. The CMF50249R00FHEB maintains identical resistance (249 Ohms), tolerance (±1%), power rating (0.25W), and temperature coefficient (±50ppm/°C). It is the manufacturer-recommended equivalent and provides enhanced moisture resistance. Axial package compatibility ensures mechanical fit in existing PCB layouts.

Q: What is the primary difference between CMF55249R00FHEB and the original RNF14FTC249R?

A: The CMF55249R00FHEB provides double the power rating (0.5W vs 0.25W) while maintaining identical resistance and tolerance values. This upgrade is suitable for applications requiring higher current handling or thermal margin. All other electrical parameters remain compatible.

Q: When should CPF1249R00BEEE6 be selected over other substitutes?

A: Select CPF1249R00BEEE6 when the application requires precision tolerance (±0.1%), operates at elevated temperatures (up to 230°C), or demands superior stability (±25ppm/°C temperature coefficient). The 1W power rating provides maximum thermal capability for demanding circuits.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. RNF14FTC249R and all listed substitutes (CMF50249R00FHEB, CMF55249R00FHEB, CPF1249R00BEEE6) are ROHS3 compliant, ensuring regulatory compliance for EU and global markets.

Q: Do the substitute parts fit the same PCB footprint as the original RNF14FTC249R?

A: All substitutes use axial through-hole package construction. Physical dimensions vary slightly (CMF50249R00FHEB: 0.065" Dia x 0.150" L; CMF55249R00FHEB: 0.090" Dia x 0.240" L; CPF1249R00BEEE6: 0.090" Dia x 0.240" L vs original 0.093" Dia x 0.250" L), but standard axial component spacing accommodates these variations. Verify PCB layout clearances for high-density designs.

Q: What inventory levels are available for each substitute?

A: CMF50249R00FHEB: 1730 units; CMF55249R00FHEB: 8274 units; CPF1249R00BEEE6: 2353 units. All parts are active production items with immediate availability.