RNF14FTC2M49 Equivalent & Substitute Parts

Part Overview

The RNF14FTC2M49 is a 2.49 MOhms ±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 in compact form factors. The part maintains Active product status with 965 units in current inventory. Substitute parts are identified to address availability, enhanced performance ratings, or specific application requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

RNF14FTC2M49

Stackpole Electronics IncIn Stock: 977RNF14FTC2M49 Datasheet

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CMF552M4900FHEB

Vishay DaleIn Stock: 3047CMF552M4900FHEB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF14FTC2M49 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Resistance value: 2.49 MOhms
• Tolerance: ±1%
• Composition: Metal Film
• Package type: Axial through-hole
• Temperature coefficient: ±50ppm/°C
• RoHS compliance: ROHS3 Compliant

Allowable Variation Parameters:

• Power rating: Equal to or greater than 0.25W
• Operating temperature range: Equal to or exceeding -55°C ~ 155°C
• Physical dimensions: Minor variations acceptable within axial package constraints
• Packaging format: Tape & Reel or Cut Tape formats are interchangeable for component selection

The CMF552M4900FHEB qualifies as a direct substitute based on matching all mandatory parameters while providing enhanced power rating (0.5W vs 0.25W) and extended upper operating temperature limit (175°C vs 155°C).

Parameter Comparison

Engineering Selection Recommendations

The CMF552M4900FHEB serves as a qualified substitute for the RNF14FTC2M49 in applications where component availability or enhanced thermal performance is required. Both parts maintain ROHS3 compliance and identical electrical specifications for resistance, tolerance, and temperature coefficient.

Selection of the CMF552M4900FHEB is appropriate when:

• Higher power dissipation capability is beneficial (0.5W vs 0.25W rating)
• Extended upper operating temperature range is required (175°C vs 155°C maximum)
• Moisture-resistant construction provides additional environmental protection
• Higher inventory availability is a procurement advantage

The RNF14FTC2M49 remains the primary choice for applications with strict space constraints or where the 0.25W power rating is specifically required by design specifications.

Frequently Asked Questions (FAQ)

Q: Can the CMF552M4900FHEB replace the RNF14FTC2M49 in existing designs?

A: Yes. Both components share identical resistance value (2.49 MOhms), tolerance (±1%), temperature coefficient (±50ppm/°C), and composition (metal film). The substitute provides equal or superior performance in all electrical parameters. Physical dimensions are comparable within axial package tolerances.

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

A: The CMF552M4900FHEB is rated at 0.5W compared to the RNF14FTC2M49 at 0.25W. This higher rating provides additional thermal margin in applications with elevated power dissipation, reducing component stress and extending service life. The substitute is backward-compatible for applications originally specified at 0.25W.

Q: Are there packaging format differences between these parts?

A: The RNF14FTC2M49 is supplied in Tape & Reel (TR) format, while the CMF552M4900FHEB is supplied in Cut Tape (CT) format. Both formats are standard for through-hole component distribution and do not affect electrical performance or PCB assembly compatibility.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the RNF14FTC2M49 and CMF552M4900FHEB are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. Both carry identical HTSUS classification (8533.21.0090).

Q: What is the temperature coefficient specification and why does it matter?

A: Both parts specify ±50ppm/°C temperature coefficient, indicating resistance value stability across temperature variations. This specification ensures predictable circuit behavior in applications subject to thermal cycling or wide operating temperature ranges.

Q: Are the physical dimensions identical?

A: Dimensions are similar but not identical. The RNF14FTC2M49 measures 0.093" Dia x 0.250" L (2.35mm x 6.35mm), while the CMF552M4900FHEB measures 0.090" Dia x 0.240" L (2.29mm x 6.10mm). Both fit standard axial component footprints with negligible dimensional variance.