RNF14FTC2K49 Equivalent & Substitute Parts

Part Overview

The RNF14FTC2K49 is a 2.49 kOhm ±1% metal film axial resistor rated at 0.25W (1/4W) manufactured by Stackpole Electronics Inc. This component is designed for through-hole applications requiring flame retardant coating and safety-rated construction. The part maintains Active product status with 656 units in current inventory. Substitute parts are identified to address application requirements including higher power ratings, extended temperature ranges, or alternative packaging configurations while maintaining core electrical specifications.

Substiute Parts

RNF14FTC2K49

Stackpole Electronics IncIn Stock: 738RNF14FTC2K49 Datasheet

Current PartRFQ

CMF552K4900FHEB

Vishay DaleIn Stock: 1552CMF552K4900FHEB Datasheet

UpgradeRFQ

CMF502K4900FHEB

Vishay DaleIn Stock: 7437CMF502K4900FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14FTC2K49 are qualified based on the following electrical and mechanical parameters:

Core Electrical Specifications (Non-Negotiable):

• Resistance value: 2.49 kOhms
• Tolerance: ±1%
• Composition: Metal Film
• Temperature Coefficient: ±50ppm/°C

Allowable Variations:

• Power rating may be equal or higher (0.25W minimum)
• Operating temperature range may be extended (minimum -55°C ~ 155°C)
• Physical dimensions may vary within axial package constraints
• Packaging format may differ (Tape & Reel vs. Cut Tape)
• Additional features (moisture resistance) are acceptable enhancements

Compliance Requirements:

• RoHS3 Compliant
• REACH Unaffected
• Active product status

Two substitute parts meet these criteria: CMF502K4900FHEB (manufacturer-recommended direct equivalent) and CMF552K4900FHEB (upgraded power rating variant).

Parameter Comparison

Engineering Selection Recommendations

CMF502K4900FHEB (Manufacturer-Recommended Equivalent): This part is the primary substitute for direct replacement applications. It maintains identical electrical specifications (2.49 kOhms, ±1%, 0.25W) and temperature coefficient while offering extended operating temperature range (-55°C ~ 175°C vs. -55°C ~ 155°C). The addition of moisture-resistant coating provides enhanced environmental protection. Both parts are ROHS3 Compliant and REACH Unaffected with Active product status. Higher inventory availability (7358 units) supports supply chain continuity.

CMF552K4900FHEB (Upgraded Power Rating): This variant is suitable for applications requiring higher power dissipation capacity. The 0.5W (1/2W) rating provides 2x power headroom compared to the original 0.25W specification while maintaining all other electrical parameters. Extended temperature range and moisture-resistant features are included. Selection of this part is appropriate when thermal margin or power budget considerations necessitate higher power rating, provided circuit board layout and thermal management accommodate the slightly larger physical dimensions.

Frequently Asked Questions (FAQ)

Q: Can CMF502K4900FHEB be used as a direct drop-in replacement for RNF14FTC2K49?

A: Yes. CMF502K4900FHEB maintains identical resistance (2.49 kOhms), tolerance (±1%), power rating (0.25W), and temperature coefficient (±50ppm/°C). The extended operating temperature range (-55°C ~ 175°C) and moisture-resistant coating are compatible enhancements. Axial package configuration is identical. Verify PCB layout accommodates the slightly smaller physical dimensions (0.065" Dia x 0.150" L vs. 0.093" Dia x 0.250" L).

Q: When should CMF552K4900FHEB be selected instead of CMF502K4900FHEB?

A: CMF552K4900FHEB is selected when the application requires higher power dissipation capacity. The 0.5W rating provides additional thermal margin compared to the 0.25W specification. All other electrical parameters remain identical. Physical dimensions are comparable (0.090" Dia x 0.240" L). This selection is appropriate for high-ambient-temperature environments or circuits with elevated power dissipation requirements.

Q: Are there packaging format differences between these parts?

A: Yes. RNF14FTC2K49 is supplied in Tape & Reel (TR) format, while both CMF502K4900FHEB and CMF552K4900FHEB are supplied in Cut Tape (CT) format. This difference affects procurement and assembly processes but does not impact electrical performance or component functionality.

Q: Do all three parts meet the same compliance requirements?

A: Yes. RNF14FTC2K49, CMF502K4900FHEB, and CMF552K4900FHEB are all ROHS3 Compliant and REACH Unaffected. All three maintain Active product status. Flame retardant coating and safety features are present in all variants.

Q: What is the temperature coefficient significance for these resistors?

A: All three parts share an identical temperature coefficient of ±50ppm/°C. This parameter defines resistance value drift across the operating temperature range. The matching coefficient ensures equivalent circuit behavior across thermal extremes, supporting direct substitution without circuit performance degradation.