RNF14FTD4M99 Equivalent & Substitute Parts

Part Overview

The RNF14FTD4M99 is a 4.99 MOhms ±1% metal film axial through-hole resistor rated at 0.25W (1/4W) manufactured by Stackpole Electronics Inc. This component is classified as Active product status with flame retardant coating and safety features suitable for general-purpose electronic applications requiring precision resistance values in high-impedance circuits. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility within specified tolerance parameters.

Substiute Parts

RNF14FTD4M99

Stackpole Electronics IncIn Stock: 1121RNF14FTD4M99 Datasheet

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CMF554M9900FHEB

Vishay DaleIn Stock: 7482CMF554M9900FHEB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14FTD4M99 are qualified based on the following electrical and mechanical parameters:

Critical Parameters (Must Match):

• Resistance value: 4.99 MOhms
• Tolerance: ±1%
• Composition: Metal Film
• Package type: Axial through-hole
• Number of terminations: 2
• RoHS compliance: ROHS3 Compliant

Allowable Variations:

• Power rating: Higher power ratings (0.5W or greater) are acceptable as they provide equal or superior thermal performance
• Operating temperature range: Extended ranges are acceptable
• Temperature coefficient: Lower values indicate improved stability
• Physical dimensions: Minor variations within axial package specifications are acceptable
• Packaging format: Both Tape & Reel (TR) and Cut Tape (CT) formats are functionally equivalent

The CMF554M9900FHEB qualifies as a substitute based on matching all critical parameters while offering enhanced specifications in power rating (0.5W vs 0.25W), temperature coefficient (±50ppm/°C vs ±100ppm/°C), and extended operating temperature range (-55°C ~ 175°C vs -55°C ~ 155°C).

Parameter Comparison

Engineering Selection Recommendations

Both the RNF14FTD4M99 and CMF554M9900FHEB are Active product status components with ROHS3 compliance and REACH Unaffected designation, meeting current regulatory requirements for electronic component procurement.

The CMF554M9900FHEB offers specification enhancements including doubled power dissipation capacity (0.5W vs 0.25W), improved temperature stability (±50ppm/°C vs ±100ppm/°C), extended maximum operating temperature (175°C vs 155°C), and additional moisture resistance features. These enhancements provide superior performance margins in applications subject to thermal stress or humidity exposure.

Selection between these parts depends on application-specific thermal and environmental requirements. The RNF14FTD4M99 remains suitable for standard operating conditions within its specified parameters. The CMF554M9900FHEB is appropriate for applications requiring enhanced thermal headroom or extended temperature operation.

Frequently Asked Questions (FAQ)

Q: Can CMF554M9900FHEB directly replace RNF14FTD4M99 in existing designs?

A: Yes. Both components share identical resistance (4.99 MOhms), tolerance (±1%), composition (metal film), and axial package configuration. The substitute offers equal or superior electrical performance with no circuit redesign required.

Q: What is the significance of the power rating difference?

A: The CMF554M9900FHEB is rated at 0.5W compared to the RNF14FTD4M99 at 0.25W. Higher power rating indicates greater thermal dissipation capability. In applications where the original 0.25W rating is adequate, the 0.5W substitute provides additional thermal margin without affecting circuit operation.

Q: Are there physical dimension compatibility concerns?

A: Both components use axial through-hole packaging. The RNF14FTD4M99 measures 0.093" Dia x 0.250" L (2.35mm x 6.35mm); the CMF554M9900FHEB measures 0.090" Dia x 0.240" L (2.29mm x 6.10mm). These minor dimensional variations are within standard axial package tolerances and do not affect PCB footprint compatibility.

Q: What packaging formats are available?

A: The RNF14FTD4M99 is supplied in Tape & Reel (TR) format. The CMF554M9900FHEB is supplied in Cut Tape (CT) format. Both formats contain identical components; packaging format selection depends on assembly process requirements and order quantity.

Q: Do both parts meet current compliance standards?

A: Yes. Both the RNF14FTD4M99 and CMF554M9900FHEB are ROHS3 compliant and REACH Unaffected, meeting current regulatory requirements for electronic component use in regulated markets.