RNF14FTD4M02 Equivalent & Substitute Parts

Part Overview

The RNF14FTD4M02 is a 4.02 MOhms ±1% metal film axial resistor rated at 0.25W (1/4W) 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 maintains Active product status with 840 units currently in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility allow direct replacement in circuit designs.

Substiute Parts

RNF14FTD4M02

Stackpole Electronics IncIn Stock: 860RNF14FTD4M02 Datasheet

Current PartRFQ

CMF554M0200FHEB

Vishay DaleIn Stock: 1989CMF554M0200FHEB Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14FTD4M02 are qualified based on the following criteria:

Electrical Equivalence: Resistance value (4.02 MOhms) and tolerance (±1%) must match exactly. Composition must be metal film to maintain performance characteristics.

Mechanical Compatibility: Package type must be axial with two terminations for direct board-level replacement.

Environmental & Compliance: RoHS3 compliance and flame retardant coating are required. Operating temperature range and temperature coefficient determine thermal performance suitability.

Power Rating Consideration: The substitute part CMF554M0200FHEB is rated at 0.5W (1/2W), which exceeds the original 0.25W specification. This represents an upgrade path where higher power dissipation capability is acceptable in the application circuit.

Parameter Comparison

Engineering Selection Recommendations

The CMF554M0200FHEB qualifies as a direct substitute for the RNF14FTD4M02 based on matching electrical specifications (4.02 MOhms, ±1% tolerance, metal film composition) and compatible axial package configuration. Both parts maintain ROHS3 compliance and flame retardant safety features required for regulated applications.

The substitute part offers performance enhancements: improved temperature coefficient (±50ppm/°C versus ±100ppm/°C), extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 155°C), and higher power dissipation capability (0.5W versus 0.25W). The addition of moisture-resistant properties in the substitute provides enhanced environmental protection.

Physical dimensions are comparable with minimal variation (0.090" Dia x 0.240" L for substitute versus 0.093" Dia x 0.250" L for main part), ensuring board-level fit compatibility. The substitute is available in higher inventory quantity (1953 units versus 840 units).

Frequently Asked Questions (FAQ)

Q: Can CMF554M0200FHEB replace RNF14FTD4M02 in all applications?

A: Yes, for applications where the circuit design accommodates the substitute's specifications. The matching resistance value (4.02 MOhms) and tolerance (±1%) ensure electrical equivalence. The higher power rating (0.5W) is compatible with circuits designed for 0.25W operation. Verify board layout accommodates the slightly smaller physical dimensions (0.090" Dia x 0.240" L).

Q: What is the significance of the power rating difference?

A: The substitute's 0.5W rating exceeds the original 0.25W specification. This represents an upgrade that allows higher current handling without thermal stress. In circuits operating within the original 0.25W design envelope, the substitute performs identically with additional thermal margin.

Q: Are there packaging considerations for substitution?

A: The main part is supplied in Tape & Reel (TR) format while the substitute is Cut Tape (CT). Both are suitable for through-hole assembly. Verify your procurement and assembly processes accommodate the packaging format change.

Q: How do temperature coefficients affect substitution?

A: The substitute's ±50ppm/°C temperature coefficient is superior to the main part's ±100ppm/°C. This means the substitute maintains tighter resistance tolerance across the operating temperature range, providing improved stability in temperature-sensitive applications.

Q: Is the moisture-resistant feature of the substitute significant?

A: The CMF554M0200FHEB includes moisture-resistant properties not specified for the RNF14FTD4M02. This provides additional environmental protection in humid or moisture-prone operating conditions without affecting electrical performance in standard applications.