RNF14FTC2M21 Equivalent & Substitute Parts

Part Overview

The RNF14FTC2M21 is a 2.21 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 1133 units in current inventory. Substitute parts are identified to address application requirements such as increased power dissipation capability, extended operating temperature ranges, or alternative packaging availability while maintaining core electrical specifications.

Substiute Parts

RNF14FTC2M21

Stackpole Electronics IncIn Stock: 1169RNF14FTC2M21 Datasheet

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CMF552M2100FHEB

Vishay DaleIn Stock: 5150CMF552M2100FHEB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF14FTC2M21 is determined by the following critical parameters:

Core Electrical Compatibility:

• Resistance value: 2.21 MOhms (exact match required)
• Tolerance: ±1% (exact match required)
• Composition: Metal Film (exact match required)
• Temperature Coefficient: ±50ppm/°C (exact match required)

Mechanical Compatibility:

• Package Type: Axial (exact match required)
• Number of Terminations: 2 (exact match required)

Allowable Variations:

• Power Rating: May be equal to or greater than 0.25W
• Operating Temperature Range: May be equal to or extended beyond -55°C ~ 155°C
• Physical Dimensions: Minor variations acceptable within industry standards for axial packages
• Packaging Format: May differ (Tape & Reel, Cut Tape, etc.)

The CMF552M2100FHEB qualifies as a substitute based on matching all core electrical parameters and mechanical compatibility, while offering increased power dissipation (0.5W vs 0.25W) and extended maximum operating temperature (175°C vs 155°C).

Parameter Comparison

Engineering Selection Recommendations

RNF14FTC2M21 Selection Criteria:

• Applications requiring ROHS3 compliance verification
• Designs with strict thermal constraints limited to 155°C maximum
• Preference for Stackpole Electronics Inc supply chain
• Tape & Reel packaging requirement for automated assembly

CMF552M2100FHEB Selection Criteria:

• Applications requiring higher power dissipation (0.5W vs 0.25W)
• Designs operating at elevated temperatures up to 175°C
• Moisture-resistant coating requirement for humid environments
• Vishay Dale supply chain preference or availability advantage
• Cut Tape packaging compatibility with manual or selective assembly processes

Both parts maintain Active product status and metal film construction with identical resistance, tolerance, and temperature coefficient specifications. Selection between these parts should be based on thermal environment requirements, power dissipation needs, and supply chain considerations rather than electrical performance differences.

Frequently Asked Questions (FAQ)

Q: Can CMF552M2100FHEB be used as a direct replacement for RNF14FTC2M21 in all applications?

A: CMF552M2100FHEB is electrically and mechanically compatible for applications where the original 0.25W power rating is not a limiting factor. The higher 0.5W rating of the substitute provides additional thermal margin. Physical dimensions differ slightly (0.090" vs 0.093" diameter; 0.240" vs 0.250" length), which may affect board layout in space-constrained designs. Verify PCB footprint compatibility before substitution.

Q: What is the significance of the ±50ppm/°C temperature coefficient match?

A: The temperature coefficient determines how the resistance value changes with temperature. Both parts maintain identical ±50ppm/°C specifications, ensuring equivalent frequency response and circuit stability across the operating temperature range. This parameter is critical for precision analog circuits and must match exactly for true substitution.

Q: Does the moisture-resistant feature of CMF552M2100FHEB affect compatibility?

A: Moisture resistance is an additional feature that does not negatively impact compatibility. The CMF552M2100FHEB's moisture-resistant coating provides enhanced reliability in humid or corrosive environments compared to the RNF14FTC2M21. This represents an upgrade in environmental protection without changing electrical characteristics.

Q: Are there packaging implications when switching from Tape & Reel to Cut Tape format?

A: Tape & Reel (TR) packaging is optimized for high-volume automated assembly lines, while Cut Tape (CT) packaging is suitable for lower-volume production or manual assembly. The electrical and mechanical properties remain identical. Verify that your assembly process can accommodate the different packaging format before substitution.

Q: Why is the operating temperature range extended to 175°C for the substitute part?

A: The CMF552M2100FHEB's extended maximum operating temperature of 175°C (versus 155°C for the RNF14FTC2M21) reflects the thermal capability of the higher power-rated component. This allows operation in higher-temperature environments without derating. Applications limited to 155°C maximum do not require this extended range.