RNMF12FTD301K Equivalent & Substitute Parts

Part Overview

The RNMF12FTD301K is a 301 kOhms ±1% metal film axial through-hole resistor rated at 0.5W (1/2W) manufactured by Stackpole Electronics Inc. This component is classified as Active product status with flame retardant coating and safety features suitable for industrial and commercial applications. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity across manufacturing environments.

Substiute Parts

RNMF12FTD301K

Stackpole Electronics IncIn Stock: 695RNMF12FTD301K Datasheet

Current PartRFQ

MFR-25FBF52-301K

YAGEOIn Stock: 10549MFR-25FBF52-301K Datasheet

DirectRFQ

CMF55301K00FHEB

Vishay DaleIn Stock: 1380CMF55301K00FHEB Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNMF12FTD301K is determined by the following critical parameters:

Primary Substitution Criteria:

• Resistance value: 301 kOhms (exact match required)
• Tolerance: ±1% (exact match required)
• Composition: Metal Film (exact match required)
• Package: Axial through-hole (exact match required)

Secondary Compatibility Parameters:

• Power rating: 0.5W minimum (equal or higher acceptable)
• Temperature coefficient: ±100ppm/°C or better (lower values acceptable)
• Operating temperature range: Must encompass -55°C to 155°C minimum
• RoHS compliance: ROHS3 Compliant (required for regulatory alignment)

Substitute parts are classified into two categories: Direct equivalents (matching all primary criteria) and upgrade alternatives (matching primary criteria with enhanced secondary specifications).

Parameter Comparison

Engineering Selection Recommendations

MFR-25FBF52-301K (YAGEO): This direct equivalent maintains all primary substitution criteria with identical resistance, tolerance, composition, and package type. The power rating is reduced to 0.25W, which represents a functional limitation in applications requiring the full 0.5W dissipation capacity of the original part. This substitute is suitable for circuits where thermal load does not exceed 0.25W. All regulatory certifications (ROHS3 Compliant) align with the main part. Product status is Active.

CMF55301K00FHEB (Vishay Dale): This upgrade alternative matches all primary substitution criteria and provides enhanced secondary specifications. The temperature coefficient is improved to ±50ppm/°C (versus ±100ppm/°C), offering superior frequency stability. The operating temperature range extends to 175°C, providing additional thermal margin. Power rating remains at 0.5W, maintaining full compatibility with the original design envelope. Additional features include moisture-resistant coating and flame retardant properties. RoHS3 compliance and Active product status are confirmed.

Frequently Asked Questions (FAQ)

Q: Can MFR-25FBF52-301K replace RNMF12FTD301K in all applications?

A: MFR-25FBF52-301K is electrically equivalent for resistance, tolerance, and temperature coefficient. However, the power rating is reduced from 0.5W to 0.25W. Substitution is valid only in circuits where power dissipation does not exceed 0.25W. Thermal analysis of the application is required before selection.

Q: What are the advantages of CMF55301K00FHEB over the original part?

A: CMF55301K00FHEB provides improved temperature coefficient (±50ppm/°C versus ±100ppm/°C), extended operating temperature range (-55°C to 175°C versus -55°C to 155°C), and moisture-resistant coating. These enhancements support applications requiring superior frequency stability and thermal performance. All primary electrical specifications remain identical.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both MFR-25FBF52-301K and CMF55301K00FHEB are ROHS3 Compliant, matching the regulatory status of the original RNMF12FTD301K.

Q: Does packaging format affect electrical performance?

A: No. Packaging format (Tape & Reel, Bulk, or Cut Tape) affects procurement and assembly logistics only. Electrical performance and component specifications remain identical regardless of packaging format.

Q: Can I use CMF55301K00FHEB as a direct replacement without circuit modification?

A: Yes. CMF55301K00FHEB is a direct replacement with identical primary electrical specifications and enhanced secondary performance characteristics. No circuit modification is required.

Q: What is the significance of the temperature coefficient difference?

A: Temperature coefficient (±100ppm/°C versus ±50ppm/°C) indicates resistance value drift per degree Celsius change. Lower values represent better frequency stability. CMF55301K00FHEB exhibits half the drift rate, beneficial in precision analog circuits and frequency-dependent applications.