RNF14FAD4K99 Equivalent & Substitute Parts

Part Overview

The RNF14FAD4K99 is a 4.99 kOhms ±1% metal film through-hole resistor rated at 0.25W (1/4W) in axial package configuration, manufactured by Stackpole Electronics Inc. This component features flame retardant coating and safety design, with operating temperature range from -55°C to 155°C. The part is currently active in production with 915 units in stock. Substitute parts are identified to address packaging format availability, enhanced performance specifications, or inventory requirements while maintaining electrical compatibility.

Substiute Parts

RNF14FAD4K99

Stackpole Electronics IncIn Stock: 931RNF14FAD4K99 Datasheet

Current PartRFQ

RNF14FTD4K99

Stackpole Electronics IncIn Stock: 115032RNF14FTD4K99 Datasheet

DirectRFQ

RNF14FTC4K99

Stackpole Electronics IncIn Stock: 711RNF14FTC4K99 Datasheet

UpgradeRFQ

CMF554K9900BHEB

Vishay DaleIn Stock: 3802CMF554K9900BHEB Datasheet

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CMF554K9900FHEB

Vishay DaleIn Stock: 11525CMF554K9900FHEB Datasheet

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CMF554K9900FKEB

Vishay DaleIn Stock: 6197CMF554K9900FKEB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts are grouped into two categories based on allowed electrical and mechanical parameters:

Direct Substitutes (Same Electrical Specifications):

• RNF14FTD4K99: Identical electrical specifications to RNF14FAD4K99, differing only in packaging format (Cut Tape vs. Tape & Box)

Upgraded Substitutes (Enhanced Specifications):

• RNF14FTC4K99: Stackpole Electronics Inc part with improved temperature coefficient (±50ppm/°C vs. ±100ppm/°C), same power rating and tolerance, packaged in Tape & Reel format
• CMF554K9900BHEB, CMF554K9900FHEB, CMF554K9900FKEB: Vishay Dale CMF series parts with higher power rating (0.5W vs. 0.25W), enhanced tolerance (±0.1% for BHEB variant), improved temperature coefficient (±50ppm/°C or ±100ppm/°C), and extended operating temperature range (-55°C to 175°C vs. -55°C to 155°C)

Substitution is permitted when the substitute part maintains or exceeds the electrical performance requirements (resistance value, tolerance, power rating) and mechanical compatibility (axial package, through-hole configuration).

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the main part RNF14FAD4K99. Selection between substitutes depends on application requirements:

RNF14FTD4K99 provides direct electrical equivalence with improved packaging availability (114,982 units in stock) for applications requiring standard 1/4W, ±1% tolerance specifications.

RNF14FTC4K99 offers improved temperature coefficient stability (±50ppm/°C) within the same power rating and tolerance class, suitable for precision applications requiring tighter thermal drift performance.

CMF554K9900FHEB provides the highest inventory availability (11,478 units) with doubled power dissipation capability (0.5W), improved temperature coefficient (±50ppm/°C), and extended operating temperature range to 175°C, making it suitable for applications with higher thermal or power margin requirements.

CMF554K9900BHEB delivers the tightest tolerance specification (±0.1%) with enhanced power rating and temperature range, appropriate for high-precision circuit applications.

CMF554K9900FKEB matches the original temperature coefficient (±100ppm/°C) while providing increased power rating and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can RNF14FTD4K99 be used as a direct replacement for RNF14FAD4K99?

A: Yes. RNF14FTD4K99 is electrically and mechanically identical to RNF14FAD4K99, with the only difference being packaging format (Cut Tape vs. Tape & Box). Both are 4.99 kΩ ±1% metal film resistors rated at 0.25W with ±100ppm/°C temperature coefficient and -55°C to 155°C operating range.

Q: What are the advantages of using CMF554K9900FHEB over RNF14FAD4K99?

A: CMF554K9900FHEB provides three enhancements: doubled power rating (0.5W vs. 0.25W), improved temperature coefficient (±50ppm/°C vs. ±100ppm/°C), and extended operating temperature range (-55°C to 175°C vs. -55°C to 155°C). These upgrades are backward compatible for applications designed around the original 1/4W specification.

Q: Are all substitute parts available in the same axial package configuration?

A: Yes. All substitute parts listed maintain the axial through-hole package type with identical mechanical footprint compatibility. Physical dimensions vary slightly between Stackpole RNF and Vishay Dale CMF series (0.093" vs. 0.090" diameter), but both are standard axial configurations suitable for PCB mounting.

Q: Which substitute part offers the best tolerance specification?

A: CMF554K9900BHEB provides ±0.1% tolerance, the tightest specification among all listed parts. The original RNF14FAD4K99 and most substitutes are specified at ±1% tolerance.

Q: Can Vishay Dale CMF parts be substituted for Stackpole RNF parts in production?

A: Yes, provided the application requirements permit the specification changes. CMF parts offer enhanced performance (higher power rating, better temperature coefficient, extended temperature range) and are fully compatible from an electrical and mechanical standpoint. All parts maintain ROHS3 compliance and equivalent regulatory status.