RNF14FTC28K7 Equivalent & Substitute Parts

Part Overview

The RNF14FTC28K7 is a 28.7 kOhms ±1% 0.25W axial through-hole resistor manufactured by Stackpole Electronics Inc. This metal film resistor features flame retardant coating and safety construction, designed for applications requiring precision resistance values with tight tolerance specifications. The part is currently active in production with 857 units in stock. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when design requirements permit higher power ratings or enhanced environmental performance.

Substiute Parts

RNF14FTC28K7

Stackpole Electronics IncIn Stock: 965RNF14FTC28K7 Datasheet

Current PartRFQ

CMF5528K700FHEB

Vishay DaleIn Stock: 1755CMF5528K700FHEB Datasheet

UpgradeRFQ

CMF5028K700FHEB

Vishay DaleIn Stock: 1791CMF5028K700FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14FTC28K7 are qualified based on the following electrical and mechanical parameters:

Critical Parameters (Must Match):

• Resistance value: 28.7 kOhms
• Tolerance: ±1%
• Composition: Metal Film
• Package type: Axial through-hole
• Temperature coefficient: ±50ppm/°C
• RoHS compliance: ROHS3 Compliant

Allowable Variations:

• Power rating: May be equal or higher than 0.25W
• Operating temperature range: May be equal or extended
• Physical dimensions: May vary within axial package constraints
• Packaging format: Cut Tape (CT) acceptable as alternative to Tape & Reel (TR)
• Manufacturer: Alternative qualified manufacturers permitted

The two identified substitutes meet all critical parameters while offering either increased power dissipation capability or enhanced environmental performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

CMF5028K700FHEB (MFR Recommended): This substitute maintains identical electrical specifications and power rating to the RNF14FTC28K7 while providing extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 155°C). The Vishay Dale CMF50 series offers moisture-resistant construction and is ROHS3 compliant. Physical dimensions are reduced (0.065" Dia x 0.150" L), which may provide space advantages in compact layouts. This part is recommended for direct replacement in applications where the original part is unavailable.

CMF5528K700FHEB (Upgrade): This substitute provides doubled power dissipation capability (0.5W versus 0.25W) while maintaining all other electrical parameters. The CMF55 series offers the same moisture-resistant and flame retardant features with extended temperature range. Larger physical dimensions (0.090" Dia x 0.240" L) require verification of board layout compatibility. This upgrade is suitable for applications requiring increased thermal margin or where power dissipation analysis indicates higher stress conditions.

Both substitutes are active production parts with superior inventory availability and meet all regulatory compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can CMF5528K700FHEB be used as a direct replacement for RNF14FTC28K7?

A: Yes, with layout verification. The CMF5528K700FHEB maintains identical electrical specifications (28.7 kOhms ±1%, ±50ppm/°C) and meets all compliance requirements. The increased power rating (0.5W versus 0.25W) is not detrimental to circuit operation. However, the larger physical dimensions (0.090" Dia x 0.240" L versus 0.093" Dia x 0.250" L) must be confirmed compatible with PCB layout and component spacing constraints.

Q: What is the difference between CMF5028K700FHEB and CMF5528K700FHEB?

A: Both are Vishay Dale metal film axial resistors with identical resistance, tolerance, and temperature coefficient. The primary difference is power rating: CMF5028K700FHEB is rated 0.25W (matching the original part), while CMF5528K700FHEB is rated 0.5W. Physical dimensions also differ: CMF5028K700FHEB is smaller (0.065" Dia x 0.150" L) while CMF5528K700FHEB is larger (0.090" Dia x 0.240" L). Select based on available board space and thermal requirements.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both CMF5528K700FHEB and CMF5028K700FHEB are ROHS3 compliant, matching the compliance status of the RNF14FTC28K7.

Q: What is the packaging difference between the main part and substitutes?

A: The RNF14FTC28K7 is supplied in Tape & Reel (TR) format. Both substitute parts are supplied in Cut Tape (CT) format. This affects handling and automated assembly processes but does not impact electrical performance or component functionality.

Q: Do the substitutes offer any performance advantages?

A: Both substitutes provide extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 155°C) and moisture-resistant construction. CMF5528K700FHEB additionally provides doubled power dissipation capability for applications with higher thermal stress.