RNF14FTC1M21 Equivalent & Substitute Parts

Part Overview

The RNF14FTC1M21 is a 1.21 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 values in compact form factors. The part maintains Active product status with 1038 units in current inventory. Substitute parts are identified to address availability constraints, extended operating temperature requirements, or packaging format preferences while maintaining electrical and mechanical compatibility.

Substiute Parts

RNF14FTC1M21

Stackpole Electronics IncIn Stock: 1121RNF14FTC1M21 Datasheet

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CMF551M2100FHEB

Vishay DaleIn Stock: 2562CMF551M2100FHEB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF14FTC1M21 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Resistance value: 1.21 MOhms
• Tolerance: ±1%
• Composition: Metal Film
• Package/Case: Axial
• Temperature Coefficient: ±50ppm/°C
• Compliance: ROHS3 Compliant, REACH Unaffected

Allowable Variation Parameters:

• Power rating may be equal or higher (0.25W minimum)
• Operating temperature range may be equal or extended
• Physical dimensions may vary within axial package constraints
• Packaging format (Tape & Reel vs. Cut Tape) does not affect electrical compatibility

The CMF551M2100FHEB qualifies as a substitute based on matching all mandatory parameters while offering increased power rating (0.5W vs. 0.25W) and extended maximum operating temperature (175°C vs. 155°C).

Parameter Comparison

Engineering Selection Recommendations

Both the RNF14FTC1M21 and CMF551M2100FHEB maintain Active product status and full compliance with ROHS3 and REACH requirements. The CMF551M2100FHEB provides enhanced thermal performance with a maximum operating temperature of 175°C compared to 155°C for the primary part, and offers doubled power dissipation capability at 0.5W. Both components are certified for safety-grade applications with flame retardant construction. Selection between these parts should be based on circuit thermal requirements and available inventory. The CMF551M2100FHEB's additional moisture resistance feature provides supplementary environmental protection in high-humidity applications.

Frequently Asked Questions (FAQ)

Q: Can CMF551M2100FHEB replace RNF14FTC1M21 in all applications? A: Yes, provided the circuit design does not require the specific physical dimensions of the RNF14FTC1M21. The CMF551M2100FHEB is electrically and mechanically compatible as an axial through-hole component with identical resistance, tolerance, and temperature coefficient specifications.

Q: What is the significance of the higher power rating on the substitute part? A: The CMF551M2100FHEB's 0.5W rating versus the RNF14FTC1M21's 0.25W rating indicates greater thermal dissipation capability. This allows operation in higher-power applications without thermal stress, though it does not change the component's electrical characteristics in lower-power circuits.

Q: Are there packaging format differences between these parts? A: The RNF14FTC1M21 is supplied in Tape & Reel (TR) format, while the CMF551M2100FHEB is supplied in Cut Tape (CT) format. Both formats contain identical components; packaging format selection depends on assembly process requirements and volume handling.

Q: Do the physical dimension differences affect PCB layout? A: The CMF551M2100FHEB is slightly smaller (0.090" Dia x 0.240" L) compared to the RNF14FTC1M21 (0.093" Dia x 0.250" L). These minor variations are within standard axial component tolerances and do not typically require PCB redesign for through-hole mounting applications.

Q: What compliance certifications apply to both parts? A: Both components are ROHS3 Compliant and REACH Unaffected, meeting current environmental and hazardous substance regulations for electronic component manufacturing and distribution.