RNF14FTD1M21 Equivalent & Substitute Parts

Part Overview

The RNF14FTD1M21 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 1015 units in current inventory. Substitute parts are identified to address application requirements such as increased power dissipation capability, improved temperature stability, or alternative packaging availability while maintaining core electrical specifications.

Substiute Parts

RNF14FTD1M21

Stackpole Electronics IncIn Stock: 1027RNF14FTD1M21 Datasheet

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CMF551M2100FHEB

Vishay DaleIn Stock: 2562CMF551M2100FHEB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The CMF551M2100FHEB from Vishay Dale qualifies as a direct substitute based on the following critical parameters:

Matching electrical specifications: Resistance value of 1.21 MOhms and tolerance of ±1% are identical. Both components utilize metal film composition with axial package configuration and two terminations.

Compliance alignment: Both parts maintain ROHS3 compliance, REACH Unaffected status, and identical ECCN/HTSUS classifications, ensuring regulatory compatibility.

Enhanced performance characteristics: The substitute provides increased power dissipation (0.5W versus 0.25W), improved temperature coefficient (±50ppm/°C versus ±100ppm/°C), and extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 155°C). Additional moisture-resistant features are included.

Physical compatibility: Both components feature axial through-hole construction with comparable dimensions suitable for standard PCB mounting.

Parameter Comparison

Engineering Selection Recommendations

Both RNF14FTD1M21 and CMF551M2100FHEB maintain Active product status with full regulatory compliance. Selection between these components depends on application thermal and power dissipation requirements. The RNF14FTD1M21 is suitable for standard-power applications within its 0.25W rating and 155°C maximum operating temperature. The CMF551M2100FHEB provides enhanced capability for applications requiring higher power dissipation, superior temperature stability through lower temperature coefficient, extended operating temperature range to 175°C, and moisture-resistant construction. Both components satisfy ROHS3 and REACH compliance requirements for regulated markets.

Frequently Asked Questions (FAQ)

Q: Can CMF551M2100FHEB directly replace RNF14FTD1M21 in existing designs?

A: Yes. Both components share identical resistance value (1.21 MOhms), tolerance (±1%), composition (metal film), and axial package configuration. Physical dimensions are comparable, supporting standard PCB mounting without layout modification.

Q: What are the key differences between these parts?

A: The primary differences are power rating (0.25W versus 0.5W), temperature coefficient (±100ppm/°C versus ±50ppm/°C), maximum operating temperature (155°C versus 175°C), and additional moisture-resistant features in the substitute. These represent performance enhancements rather than functional changes.

Q: When should I select the higher-power CMF551M2100FHEB?

A: Select CMF551M2100FHEB for applications where circuit analysis indicates power dissipation approaching or exceeding 0.25W, where temperature stability is critical, or where extended operating temperature range to 175°C is required.

Q: Are packaging formats identical?

A: Both components use axial through-hole packaging. The RNF14FTD1M21 is supplied in Tape & Reel format, while CMF551M2100FHEB is supplied in Cut Tape format. This affects procurement and assembly processes but not electrical or mechanical compatibility.

Q: Do both parts meet regulatory requirements?

A: Yes. Both components are ROHS3 compliant, REACH Unaffected, and share identical ECCN (EAR99) and HTSUS (8533.21.0090) classifications.