RNF18FTD300K Equivalent & Substitute Parts

Part Overview

The RNF18FTD300K is a 300 kOhms ±1% metal film through-hole resistor rated at 0.125W (1/8W) in axial package configuration, manufactured by Stackpole Electronics Inc. This component is classified as Active product status with ROHS3 compliance and flame retardant coating for safety applications. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this resistor category.

Substiute Parts

RNF18FTD300K

Stackpole Electronics IncIn Stock: 1040RNF18FTD300K Datasheet

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RNMF14FTC300K

Stackpole Electronics IncIn Stock: 7367RNMF14FTC300K Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The RNMF14FTC300K qualifies as a substitute for the RNF18FTD300K based on the following criteria:

Matching Parameters:

• Resistance value: 300 kOhms (identical)
• Tolerance: ±1% (identical)
• Composition: Metal Film (identical)
• Package: Axial (identical)
• Operating temperature range: -55°C ~ 155°C (identical)
• RoHS compliance: ROHS3 Compliant (identical)
• Features: Flame Retardant Coating, Safety (identical)

Allowable Variation:

• Power rating: 0.25W (1/4W) versus 0.125W (1/8W) — the substitute provides higher power dissipation capability, which is acceptable for applications requiring the original 1/8W rating
• Temperature coefficient: ±50ppm/°C versus ±100ppm/°C — the substitute offers improved temperature stability
• Physical dimensions: 0.070" Dia x 0.130" L versus 0.071" Dia x 0.130" L — negligible difference within mechanical tolerance

Parameter Comparison

Engineering Selection Recommendations

Both the RNF18FTD300K and RNMF14FTC300K are Active status components manufactured by Stackpole Electronics Inc with identical ROHS3 compliance and flame retardant safety features. The RNMF14FTC300K (1/4W) provides equivalent electrical performance for applications designed around the RNF18FTD300K (1/8W) specification. The higher power rating of the substitute part does not compromise circuit function and offers improved thermal margin. Both components maintain identical resistance, tolerance, and operating temperature specifications. Selection between these parts should be based on packaging requirements (Tape & Reel versus Cut Tape) and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the RNMF14FTC300K replace the RNF18FTD300K in all applications?

A: Yes, for applications requiring 300 kOhms ±1% resistance. The RNMF14FTC300K provides higher power dissipation (0.25W versus 0.125W), which is compatible with circuits designed for the lower-rated component. Both parts maintain identical electrical specifications for resistance, tolerance, and temperature range.

Q: What is the difference in physical size between these parts?

A: The RNF18FTD300K measures 0.071" Dia x 0.130" L (1.80mm x 3.30mm). The RNMF14FTC300K measures 0.070" Dia x 0.130" L (1.78mm x 3.30mm). The difference is negligible and both fit standard axial component footprints.

Q: Are there packaging differences between these parts?

A: Yes. The RNF18FTD300K is supplied in Tape & Reel (TR) format, while the RNMF14FTC300K is supplied in Cut Tape (CT) format. Both are suitable for through-hole assembly; packaging selection depends on production volume and handling requirements.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the RNF18FTD300K and RNMF14FTC300K are ROHS3 compliant with flame retardant coating and safety features. Both operate across the identical temperature range of -55°C to 155°C.

Q: What is the temperature coefficient difference?

A: The RNF18FTD300K has a temperature coefficient of ±100ppm/°C, while the RNMF14FTC300K has ±50ppm/°C. The substitute part offers improved temperature stability across the operating range.