RNMF12FTD1M21 Equivalent & Substitute Parts

Part Overview

The RNMF12FTD1M21 is a 1.21 MOhms ±1% metal film axial resistor rated at 0.5W (1/2W) manufactured by Stackpole Electronics Inc. This component is designed for through-hole applications requiring precision resistance with flame retardant coating and safety features. The part is currently active in production with 1055 units in stock. Substitute parts are identified when equivalent electrical and mechanical specifications are required due to component availability, supply chain considerations, or design flexibility within allowable parameter ranges.

Substiute Parts

RNMF12FTD1M21

Stackpole Electronics IncIn Stock: 1150RNMF12FTD1M21 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:

• Resistance Value: Both parts provide 1.21 MOhms
• Tolerance: Both maintain ±1% accuracy
• Power Rating: Both are rated at 0.5W (1/2W)
• Composition: Both are metal film construction
• Package: Both use axial through-hole configuration
• Compliance: Both are ROHS3 compliant and REACH unaffected
• Terminations: Both have 2 terminations

The substitute part meets or exceeds the electrical specifications of the main part while maintaining mechanical compatibility in axial package form factor.

Parameter Comparison

Engineering Selection Recommendations

Both the RNMF12FTD1M21 and CMF551M2100FHEB are active production components with ROHS3 compliance and REACH unaffected status, making them suitable for current design implementations. The CMF551M2100FHEB offers enhanced performance characteristics including a lower temperature coefficient (±50ppm/°C versus ±100ppm/°C) and an extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 155°C). The substitute part also includes moisture-resistant features in addition to flame retardant coating. Mechanical dimensions are slightly smaller in the substitute part but remain compatible with standard axial through-hole PCB layouts. Selection between these parts should be based on application-specific requirements for temperature stability and environmental exposure.

Frequently Asked Questions (FAQ)

Q: Can CMF551M2100FHEB be used as a direct replacement for RNMF12FTD1M21?

A: Yes. Both parts share identical resistance value (1.21 MOhms), tolerance (±1%), power rating (0.5W), composition (metal film), and axial package configuration. The substitute part is mechanically and electrically compatible for through-hole PCB applications.

Q: What are the physical dimension differences?

A: The RNMF12FTD1M21 measures 0.093" diameter × 0.250" length (2.35mm × 6.35mm). The CMF551M2100FHEB measures 0.090" diameter × 0.240" length (2.29mm × 6.10mm). Both dimensions are within standard axial resistor tolerances and compatible with typical PCB hole spacing.

Q: Does the substitute part offer any performance advantages?

A: The CMF551M2100FHEB provides a lower temperature coefficient (±50ppm/°C versus ±100ppm/°C) and extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 155°C). It also includes moisture-resistant features alongside flame retardant coating.

Q: Are both parts compliant with current regulations?

A: Yes. Both the RNMF12FTD1M21 and CMF551M2100FHEB are ROHS3 compliant and REACH unaffected, meeting current environmental and safety standards.

Q: What packaging formats are available?

A: The RNMF12FTD1M21 is supplied in Tape & Reel (TR) format. The CMF551M2100FHEB is supplied in Cut Tape (CT) format. Both formats are standard for through-hole component distribution.