RNF14FAC18K7 Equivalent & Substitute Parts

Part Overview

The RNF14FAC18K7 is an 18.7 kOhms ±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 flame retardant coating and safety-rated construction. The part maintains Active product status with 907 units in current inventory. Equivalent and substitute parts are identified to support procurement flexibility, design optimization, and supply chain continuity.

Substiute Parts

RNF14FAC18K7

Stackpole Electronics IncIn Stock: 968RNF14FAC18K7 Datasheet

Current PartRFQ

CMF5518K700FHEB

Vishay DaleIn Stock: 7114CMF5518K700FHEB Datasheet

UpgradeRFQ

CMF5018K700FHEB

Vishay DaleIn Stock: 1876CMF5018K700FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14FAC18K7 are qualified based on the following electrical and mechanical parameters:

Critical Parameters (Must Match):

• Resistance value: 18.7 kOhms
• Tolerance: ±1%
• Composition: Metal Film
• Package: Axial through-hole
• Temperature Coefficient: ±50ppm/°C
• Compliance: ROHS3 Compliant, REACH Unaffected

Allowable Variations:

• Power rating: Equal or greater than 0.25W
• Operating temperature range: Equal to or exceeding -55°C ~ 155°C
• Physical dimensions: Axial package form factor maintained
• Features: Flame retardant coating and safety construction maintained or enhanced

Two substitute parts meet these criteria: CMF5518K700FHEB (0.5W upgrade) and CMF5018K700FHEB (direct 0.25W equivalent).

Parameter Comparison

Engineering Selection Recommendations

CMF5018K700FHEB (Direct Equivalent): This part is the primary substitute for direct replacement applications. It maintains identical electrical specifications (18.7 kOhms, ±1%, 0.25W) and axial package form factor. The Vishay Dale CMF50 series provides enhanced moisture resistance and extended operating temperature range (-55°C ~ 175°C). Both parts are ROHS3 compliant and REACH unaffected, ensuring regulatory compatibility.

CMF5518K700FHEB (Power Upgrade): This part is suitable for applications where increased power dissipation capability is beneficial. The 0.5W rating provides thermal margin over the original 0.25W specification while maintaining all other electrical parameters. The CMF55 series offers the same moisture resistance and extended temperature range. This option is appropriate for designs where component reliability under thermal stress is a consideration.

Both substitute parts maintain the required flame retardant coating and safety construction features of the original RNF14FAC18K7.

Frequently Asked Questions (FAQ)

Q: Can CMF5018K700FHEB be used as a direct drop-in replacement for RNF14FAC18K7?

A: Yes. Both parts share identical resistance (18.7 kOhms), tolerance (±1%), power rating (0.25W), and axial package configuration. The CMF5018K700FHEB provides enhanced moisture resistance and a higher maximum operating temperature (175°C vs. 155°C), making it functionally compatible for direct substitution.

Q: What is the advantage of using CMF5518K700FHEB over CMF5018K700FHEB?

A: The CMF5518K700FHEB provides double the power rating (0.5W vs. 0.25W) while maintaining all other electrical specifications. This increased power capacity reduces thermal stress on the component during operation and may improve long-term reliability in applications with variable load conditions.

Q: Are there physical size differences between these parts?

A: Yes. The RNF14FAC18K7 measures 0.093" Dia x 0.250" L (2.35mm x 6.35mm). The CMF5518K700FHEB measures 0.090" Dia x 0.240" L (2.29mm x 6.10mm). The CMF5018K700FHEB measures 0.065" Dia x 0.150" L (1.65mm x 3.81mm). All maintain axial package form factor suitable for through-hole PCB mounting. Physical dimensions should be verified against board layout constraints.

Q: Do all substitute parts meet the same compliance requirements?

A: Yes. The RNF14FAC18K7, CMF5518K700FHEB, and CMF5018K700FHEB are all ROHS3 compliant and REACH unaffected. All parts carry flame retardant coating and safety construction features required for regulated applications.

Q: What is the temperature coefficient specification for substitute parts?

A: All three parts maintain a temperature coefficient of ±50ppm/°C, ensuring consistent resistance stability across the operating temperature range.