RNF14FTC340K Equivalent & Substitute Parts

Part Overview

The RNF14FTC340K is a 340 kOhms ±1% metal film through-hole resistor rated at 0.25W (1/4W) in axial package configuration, manufactured by Stackpole Electronics Inc. This component is designed for general-purpose applications requiring precision resistance with flame retardant coating and safety features. The part maintains Active product status with 858 units in current inventory. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained while accommodating supply chain variations or application-specific requirements.

Substiute Parts

RNF14FTC340K

Stackpole Electronics IncIn Stock: 883RNF14FTC340K Datasheet

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CMF55340K00FHEB

Vishay DaleIn Stock: 4634CMF55340K00FHEB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the RNF14FTC340K with the CMF55340K00FHEB is valid based on the following alignment of critical electrical parameters:

• Resistance Value: Both parts specify 340 kOhms
• Tolerance: Both parts maintain ±1% tolerance
• Composition: Both are metal film construction
• Temperature Coefficient: Both specify ±50ppm/°C
• Package Configuration: Both use axial through-hole package
• Compliance: Both are ROHS3 compliant

The CMF55340K00FHEB provides a higher power rating (0.5W vs. 0.25W) and extended operating temperature range (-55°C ~ 175°C vs. -55°C ~ 155°C), making it suitable for applications where the RNF14FTC340K is specified, provided circuit design accommodates the physical dimension differences.

Parameter Comparison

Engineering Selection Recommendations

Both the RNF14FTC340K and CMF55340K00FHEB maintain Active product status and full ROHS3 compliance. The CMF55340K00FHEB offers enhanced moisture resistance and a higher power dissipation capability, with slightly reduced physical dimensions. Selection between these parts should be based on application power dissipation requirements and environmental exposure conditions. The CMF55340K00FHEB is suitable for designs where the RNF14FTC340K is specified, with consideration given to PCB layout and thermal management if operating near maximum power ratings.

Frequently Asked Questions (FAQ)

Q: Can the CMF55340K00FHEB directly replace the RNF14FTC340K in existing designs?

A: Yes, provided the circuit design accommodates the higher power rating and the physical dimension differences (0.090" Dia x 0.240" L vs. 0.093" Dia x 0.250" L) do not create PCB layout conflicts. Both parts share identical resistance, tolerance, and temperature coefficient specifications.

Q: What is the significance of the higher power rating on the CMF55340K00FHEB?

A: The 0.5W rating on the CMF55340K00FHEB allows greater current handling capability compared to the 0.25W RNF14FTC340K. This provides design margin in applications with variable load conditions or thermal stress.

Q: Are there packaging differences between these parts?

A: The RNF14FTC340K is supplied in Tape & Reel (TR) packaging, while the CMF55340K00FHEB is available in Cut Tape (CT) packaging. Both are axial through-hole components suitable for automated assembly.

Q: Do both parts meet the same compliance standards?

A: Yes, both the RNF14FTC340K and CMF55340K00FHEB are ROHS3 compliant and REACH unaffected, meeting equivalent regulatory requirements for industrial and commercial applications.

Q: What is the difference in operating temperature range?

A: The RNF14FTC340K operates from -55°C to 155°C, while the CMF55340K00FHEB extends to 175°C. The CMF55340K00FHEB is suitable for applications requiring operation at elevated temperatures within this extended range.