RNF14FTC549R Equivalent & Substitute Parts

Part Overview

The RNF14FTC549R is a 549 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, designed for applications requiring precision resistance with reliable thermal performance across industrial temperature ranges. The part is currently active in production with ROHS3 compliance and maintains broad availability in inventory.

Substitute parts are identified to address supply chain continuity, packaging format preferences, or enhanced performance specifications while maintaining electrical and mechanical compatibility within the defined parameter tolerance.

Substiute Parts

RNF14FTC549R

Stackpole Electronics IncIn Stock: 760RNF14FTC549R Datasheet

Current PartRFQ

CMF55549R00FHEB

Vishay DaleIn Stock: 9869CMF55549R00FHEB Datasheet

UpgradeRFQ

CMF50549R00FHEB

Vishay DaleIn Stock: 1809CMF50549R00FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14FTC549R are qualified based on the following electrical and mechanical parameters:

Core Compatibility Criteria:

• Resistance value: 549 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Composition: Metal Film (exact match required)
• Temperature Coefficient: ±50ppm/°C (exact match required)
• Package Type: Axial (exact match required)
• Number of Terminations: 2 (exact match required)

Allowable Variations:

• Power rating: Equal or greater than 0.25W
• Operating temperature range: Equal or greater than -55°C ~ 155°C
• Manufacturer: Different manufacturer acceptable
• Packaging format: Tape & Reel (TR) or Cut Tape (CT) acceptable
• Features: Additional features (moisture resistance) acceptable

Two substitute parts meet these criteria: CMF50549R00FHEB (direct equivalent with enhanced features) and CMF55549R00FHEB (upgraded power rating variant).

Parameter Comparison

Engineering Selection Recommendations

CMF50549R00FHEB (MFR Recommended Substitute): This part provides direct electrical equivalence to the RNF14FTC549R with identical power rating (0.25W), resistance (549 Ohms), and tolerance (±1%). The CMF50 series offers an extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 155°C) and includes moisture-resistant features. Physical dimensions are smaller (0.065" Dia x 0.150" L), which may require PCB layout verification. REACH status is affected, requiring compliance review for applications subject to REACH regulations. Packaging is Cut Tape (CT) format. This part is recommended for direct replacement in applications where the smaller form factor is acceptable and REACH compliance is not a constraint.

CMF55549R00FHEB (Upgrade Substitute): This part provides electrical equivalence with an upgraded power rating of 0.5W (1/2W), double the original specification. The CMF55 series maintains identical resistance, tolerance, and temperature coefficient while extending the operating temperature range to -55°C ~ 175°C. Moisture-resistant features are included. Physical dimensions (0.090" Dia x 0.240" L) are comparable to the original part. REACH status is unaffected. This configuration is suitable for applications requiring enhanced thermal dissipation capability or where higher power margin is desired. Packaging is Cut Tape (CT) format.

Both substitute parts maintain ROHS3 compliance and active product status. Selection between CMF50549R00FHEB and CMF55549R00FHEB depends on thermal design requirements, regulatory compliance needs, and physical space constraints.

Frequently Asked Questions (FAQ)

Q: Can CMF50549R00FHEB be used as a direct drop-in replacement for RNF14FTC549R?

A: CMF50549R00FHEB provides electrical equivalence (549 Ohms ±1%, 0.25W, ±50ppm/°C, metal film composition). Physical dimensions differ (0.065" Dia x 0.150" L versus 0.093" Dia x 0.250" L), requiring PCB layout verification. Packaging format changes from Tape & Reel to Cut Tape. REACH compliance status differs and must be evaluated for your application.

Q: What is the difference between CMF50549R00FHEB and CMF55549R00FHEB?

A: Both parts share identical electrical specifications (549 Ohms ±1%, ±50ppm/°C, metal film). The primary difference is power rating: CMF50 is rated 0.25W (1/4W) matching the original part, while CMF55 is rated 0.5W (1/2W). Physical dimensions also differ slightly (CMF50: 0.065" Dia x 0.150" L; CMF55: 0.090" Dia x 0.240" L). Both offer extended operating temperature range (-55°C ~ 175°C) and moisture resistance.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, RNF14FTC549R, CMF50549R00FHEB, and CMF55549R00FHEB are all ROHS3 compliant. However, CMF50549R00FHEB has REACH affected status, while the original part and CMF55549R00FHEB have REACH unaffected status. Regulatory compliance verification is required based on your application and market.

Q: Can I use the 0.5W rated CMF55549R00FHEB in place of the 0.25W RNF14FTC549R?

A: Yes. The higher power rating (0.5W versus 0.25W) is electrically compatible and provides additional thermal margin. This substitution is valid when physical dimensions (0.090" Dia x 0.240" L) fit within PCB layout constraints and packaging format (Cut Tape) is acceptable for your assembly process.

Q: What packaging formats are available for these parts?

A: RNF14FTC549R is supplied in Tape & Reel (TR) format. Both substitute parts (CMF50549R00FHEB and CMF55549R00FHEB) are supplied in Cut Tape (CT) format. Packaging format selection impacts assembly process compatibility and should be verified with your procurement and manufacturing teams.

Q: Do the substitute parts maintain the same temperature coefficient?

A: Yes, all three parts (RNF14FTC549R, CMF50549R00FHEB, and CMF55549R00FHEB) maintain identical temperature coefficient of ±50ppm/°C, ensuring consistent performance across temperature variations.