RNF14FTC18K7 Equivalent & Substitute Parts

Part Overview

The RNF14FTC18K7 is a 18.7 kOhms ±1% 0.25W (1/4W) through-hole axial 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 1148 units in stock. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility within specified parameters.

Substiute Parts

RNF14FTC18K7

Stackpole Electronics IncIn Stock: 1244RNF14FTC18K7 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 RNF14FTC18K7 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 type: Axial
• Temperature coefficient: ±50ppm/°C
• RoHS compliance: ROHS3 Compliant

Allowable Variations:

• Power rating: Substitutes may have equal or higher power ratings (0.25W or greater)
• Operating temperature range: Substitutes may have equal or extended upper temperature limits
• Physical dimensions: Axial package dimensions may vary within component envelope constraints
• Features: Substitutes may include additional features (moisture resistance) without compromising base specifications

Two substitute parts meet these criteria: CMF5518K700FHEB (0.5W upgrade) and CMF5018K700FHEB (1/4W equivalent with enhanced features).

Parameter Comparison

Engineering Selection Recommendations

CMF5018K700FHEB (Manufacturer Recommended): This substitute maintains identical electrical specifications to the RNF14FTC18K7 with matching 0.25W power rating and operating temperature coefficient. The part adds moisture resistance features while maintaining ROHS3 compliance and all critical electrical parameters. Physical dimensions are reduced (0.065" Dia x 0.150" L versus 0.093" Dia x 0.250" L), which may provide layout advantages in space-constrained applications. Packaging is available in Tape & Reel format matching the original part specification.

CMF5518K700FHEB (Upgrade Option): This substitute provides a higher power rating of 0.5W (1/2W) while maintaining all other electrical specifications. The extended operating temperature range to 175°C provides additional thermal margin. This option is suitable for applications where increased power dissipation capability or higher temperature operation is beneficial. Packaging is available in Cut Tape format.

Both substitutes maintain ROHS3 compliance, identical resistance and tolerance values, and metal film composition. Selection between substitutes depends on packaging format requirements and application-specific power dissipation or temperature considerations.

Frequently Asked Questions (FAQ)

Q: Can CMF5518K700FHEB replace RNF14FTC18K7 in all applications? A: Yes, within the constraint that the higher 0.5W power rating does not create thermal or layout conflicts. The substitute maintains all critical electrical parameters including resistance, tolerance, and temperature coefficient. Physical dimensions are slightly smaller (0.090" Dia x 0.240" L).

Q: What is the difference between the two substitute parts? A: CMF5018K700FHEB matches the original 0.25W power rating with reduced physical dimensions and Tape & Reel packaging. CMF5518K700FHEB provides 0.5W power rating with extended temperature range to 175°C and Cut Tape packaging. Both maintain identical resistance, tolerance, and temperature coefficient specifications.

Q: Are there packaging format differences between the main part and substitutes? A: The RNF14FTC18K7 is supplied in Tape & Reel format. CMF5018K700FHEB is also available in Tape & Reel format. CMF5518K700FHEB is supplied in Cut Tape format. Packaging format selection depends on assembly process requirements and volume specifications.

Q: Do the substitute parts maintain the same temperature coefficient? A: Yes, all three parts specify ±50ppm/°C temperature coefficient. The substitute parts extend the maximum operating temperature to 175°C compared to 155°C for the original part.

Q: Are moisture resistance features required for substitution? A: No. The additional moisture resistance features in the Vishay Dale substitutes do not affect electrical compatibility. These features provide enhanced environmental protection without changing core electrical specifications.

Q: What compliance certifications apply to all parts in this comparison? A: All parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8533.21.0090.