RNF14FTC18K2 Equivalent & Substitute Parts

Part Overview

The RNF14FTC18K2 is an 18.2 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 precision resistance with flame retardant coating and safety features. The part maintains Active product status with 937 units in current inventory. Substitute parts are identified to address application requirements including higher power ratings, enhanced moisture resistance, or alternative sourcing needs while maintaining electrical and mechanical compatibility.

Substiute Parts

RNF14FTC18K2

Stackpole Electronics IncIn Stock: 1043RNF14FTC18K2 Datasheet

Current PartRFQ

CMF5518K200FHEB

Vishay DaleIn Stock: 3798CMF5518K200FHEB Datasheet

UpgradeRFQ

CMF5018K200FHEB

Vishay DaleIn Stock: 5340CMF5018K200FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14FTC18K2 are qualified based on the following criteria:

Electrical Parameters (Must Match):

• Resistance value: 18.2 kOhms
• Tolerance: ±1%
• Temperature coefficient: ±50ppm/°C
• Composition: Metal Film

Mechanical Parameters (Must Match):

• Package type: Axial through-hole
• Number of terminations: 2

Allowable Variations:

• Power rating: Equal or higher than 0.25W
• Operating temperature range: Equal or higher upper limit
• Physical dimensions: Axial package with compatible lead spacing
• Additional features: Enhanced moisture resistance permitted

Compliance Requirements (Must Match):

• RoHS3 Compliant
• REACH Unaffected status

Two substitute parts meet these criteria: CMF5018K200FHEB (direct 1/4W equivalent with enhanced features) and CMF5518K200FHEB (upgraded 1/2W variant).

Parameter Comparison

Engineering Selection Recommendations

CMF5018K200FHEB (Manufacturer Recommended): This part is the direct functional equivalent of the RNF14FTC18K2, maintaining identical electrical specifications and power rating. It provides enhanced moisture resistance and extends the operating temperature range to 175°C. Physical dimensions are smaller, which may require PCB layout verification. This part is suitable for direct replacement in applications where the original specification is maintained with added environmental protection.

CMF5518K200FHEB (Upgrade Option): This variant increases the power rating to 0.5W (1/2W) while maintaining all other electrical parameters. It is suitable for applications requiring higher thermal dissipation capability or where circuit redesign permits the use of a higher-rated component. The extended operating temperature range to 175°C and moisture resistance provide additional margin for demanding environments. Physical dimensions are comparable to the original part.

Both substitute parts maintain ROHS3 compliance and REACH Unaffected status, ensuring regulatory compatibility with the original specification.

Frequently Asked Questions (FAQ)

Q: Can CMF5018K200FHEB be used as a direct drop-in replacement for RNF14FTC18K2?

A: CMF5018K200FHEB is electrically and functionally equivalent with identical resistance, tolerance, and power rating. However, physical dimensions differ (0.065" Dia x 0.150" L versus 0.093" Dia x 0.250" L). PCB layout verification is required to confirm lead spacing and component clearance compatibility before implementation.

Q: What is the advantage of using CMF5518K200FHEB over CMF5018K200FHEB?

A: CMF5518K200FHEB provides double the power rating (0.5W versus 0.25W), allowing higher current handling and thermal dissipation. This is beneficial in applications where the circuit operates at higher power levels or where thermal margin is critical. All other electrical parameters remain identical.

Q: Are the substitute parts compatible with the original RoHS and REACH requirements?

A: Yes. Both CMF5018K200FHEB and CMF5518K200FHEB are ROHS3 Compliant and REACH Unaffected, matching the original part's regulatory status.

Q: What packaging differences exist between these parts?

A: The RNF14FTC18K2 is supplied in Tape & Reel (TR) format, while both Vishay Dale substitutes are supplied in Cut Tape (CT) format. This affects handling and assembly processes but does not impact electrical performance or component functionality.

Q: Do the substitute parts maintain the same temperature coefficient?

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

Q: What is the maximum operating temperature difference between the original and substitute parts?

A: The RNF14FTC18K2 operates to 155°C maximum, while both substitute parts extend to 175°C. This 20°C additional margin provides enhanced reliability in high-temperature applications.