RNF14FTC191R Equivalent & Substitute Parts

Part Overview

The RNF14FTC191R is a 191 Ohms ±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 applications requiring precision resistance values. The part is currently active in production with 1023 units in stock. Substitute parts may be required due to inventory constraints, packaging format preferences, or application-specific performance requirements such as higher power ratings or enhanced operating temperature ranges.

Substiute Parts

RNF14FTC191R

Stackpole Electronics IncIn Stock: 1075RNF14FTC191R Datasheet

Current PartRFQ

CMF55191R00FHEB

Vishay DaleIn Stock: 1428CMF55191R00FHEB Datasheet

UpgradeRFQ

CMF50191R00FHEB

Vishay DaleIn Stock: 2965CMF50191R00FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF14FTC191R is determined by the following critical parameters:

• Resistance Value: Must be 191 Ohms
• Tolerance: Must be ±1%
• Composition: Must be Metal Film
• Package Type: Must be Axial
• Temperature Coefficient: Must be ±50ppm/°C
• Compliance: Must maintain ROHS3 compliance

The substitute parts listed below meet all core electrical and mechanical requirements. Variations in power rating (0.5W vs. 0.25W) and operating temperature range (-55°C ~ 175°C vs. -55°C ~ 155°C) represent enhancements that maintain backward compatibility while offering extended performance margins. Physical dimensions may vary within the axial package category while maintaining electrical equivalence.

Parameter Comparison

Engineering Selection Recommendations

CMF50191R00FHEB (MFR Recommended): This part is the manufacturer-recommended substitute, offering identical power rating (0.25W) and resistance specifications to the RNF14FTC191R while providing extended operating temperature range (-55°C ~ 175°C). The CMF50 series includes moisture-resistant construction and maintains full ROHS3 compliance. With 2926 units in stock, this option provides maximum availability. Physical dimensions are reduced (0.065" Dia x 0.150" L), which may require PCB layout verification for space-constrained applications.

CMF55191R00FHEB (Upgrade Option): This part provides enhanced power dissipation capability (0.5W vs. 0.25W) while maintaining all other electrical parameters. The CMF55 series is suitable for applications requiring thermal margin or higher current handling. Extended operating temperature range (-55°C ~ 175°C) and moisture-resistant features provide additional environmental protection. Physical dimensions are slightly larger (0.090" Dia x 0.240" L). This option is appropriate when thermal performance or environmental robustness is a design consideration.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory equivalence with the original part.

Frequently Asked Questions (FAQ)

Q: Can CMF50191R00FHEB be used as a direct replacement for RNF14FTC191R?

A: Yes. Both parts share identical resistance (191 Ohms), tolerance (±1%), power rating (0.25W), temperature coefficient (±50ppm/°C), and composition (metal film). The CMF50191R00FHEB provides extended operating temperature range (-55°C ~ 175°C vs. -55°C ~ 155°C) and moisture-resistant construction. Physical dimensions differ slightly; PCB layout verification is required.

Q: What is the difference between CMF55191R00FHEB and CMF50191R00FHEB?

A: The primary difference is power rating: CMF55191R00FHEB is rated at 0.5W (1/2W), while CMF50191R00FHEB is rated at 0.25W (1/4W). Both maintain identical resistance, tolerance, and temperature coefficient. The CMF55 variant is suitable for applications requiring higher power dissipation or thermal margin. Physical dimensions also differ: CMF55 is 0.090" Dia x 0.240" L; CMF50 is 0.065" Dia x 0.150" L.

Q: Are packaging format differences significant?

A: The RNF14FTC191R is supplied in Tape & Reel (TR) format, while both substitute parts are supplied in Cut Tape (CT) format. This affects handling and assembly processes but does not impact electrical performance. Verify compatibility with your assembly equipment and procurement workflow.

Q: Do all parts meet the same compliance standards?

A: Yes. RNF14FTC191R, CMF55191R00FHEB, and CMF50191R00FHEB are all ROHS3 compliant and REACH unaffected. All parts carry EAR99 ECCN classification and 8533.21.0090 HTSUS code.

Q: Which substitute should I select for a new design?

A: CMF50191R00FHEB is the manufacturer-recommended option, offering identical specifications with extended operating temperature range and superior availability (2926 units in stock). Select CMF55191R00FHEB only if your application requires 0.5W power rating or enhanced thermal performance.