RNF18FTC3K90 Equivalent & Substitute Parts

Part Overview

The RNF18FTC3K90 is a 3.9 kOhms ±1% metal film through-hole resistor rated at 0.125W (1/8W) in axial package configuration. Manufactured by Stackpole Electronics Inc, this component features flame retardant coating and safety construction suitable for general-purpose electronic applications. The part maintains Active product status with 912 units currently in stock. Substitute parts may be required due to inventory constraints, application-specific power rating requirements, or packaging format preferences while maintaining electrical and mechanical compatibility.

Substiute Parts

RNF18FTC3K90

Stackpole Electronics IncIn Stock: 996RNF18FTC3K90 Datasheet

Current PartRFQ

RNMF14FTC3K90

Stackpole Electronics IncIn Stock: 20514RNMF14FTC3K90 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

The RNMF14FTC3K90 qualifies as a direct substitute based on the following matching parameters:

• Resistance value: 3.9 kOhms (identical)
• Tolerance: ±1% (identical)
• Composition: Metal Film (identical)
• Temperature Coefficient: ±50ppm/°C (identical)
• Operating Temperature Range: -55°C ~ 155°C (identical)
• Features: Flame Retardant Coating, Safety (identical)
• Package Type: Axial (identical)
• RoHS Status: ROHS3 Compliant (identical)
• Terminations: 2 (identical)

The primary difference is the power rating upgrade from 0.125W to 0.25W (1/4W), which represents a higher power dissipation capability. This upgrade maintains backward compatibility in applications where the original 1/8W rating is sufficient, as the substitute can handle equal or greater power levels. The packaging format differs (Tape & Reel versus Cut Tape), which affects procurement and assembly logistics but not electrical performance.

Parameter Comparison

Engineering Selection Recommendations

Both the RNF18FTC3K90 and RNMF14FTC3K90 maintain Active product status and full ROHS3 compliance. The RNMF14FTC3K90 represents an upgrade path with increased power dissipation capacity (0.25W versus 0.125W) while preserving all critical electrical parameters including resistance value, tolerance, temperature coefficient, and operating temperature range. Selection between these parts should be based on application power requirements and packaging format availability. The higher power rating of the substitute part introduces no compatibility issues in circuits designed for the original 1/8W component.

Frequently Asked Questions (FAQ)

Q: Can RNMF14FTC3K90 replace RNF18FTC3K90 in existing designs?

A: Yes. The RNMF14FTC3K90 maintains identical resistance (3.9 kOhms), tolerance (±1%), temperature coefficient (±50ppm/°C), and operating temperature range (-55°C ~ 155°C). The increased power rating (0.25W versus 0.125W) provides additional margin in power dissipation without affecting electrical performance in applications designed for the original component.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape wound on reels, suitable for high-volume automated assembly. Cut Tape (CT) packaging provides components on tape segments cut to specified lengths, suitable for lower-volume applications or manual assembly. Both formats contain identical components; the difference is procurement and handling logistics.

Q: Are there any dimensional differences between these parts?

A: Both parts use axial package configuration with nearly identical dimensions. RNF18FTC3K90 measures 0.071" diameter × 0.130" length (1.80mm × 3.30mm). RNMF14FTC3K90 measures 0.070" diameter × 0.130" length (1.78mm × 3.30mm). These minor variations do not affect PCB layout or mechanical fit.

Q: Do both parts meet the same compliance standards?

A: Yes. Both RNF18FTC3K90 and RNMF14FTC3K90 are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS code 8533.21.0090.

Q: What determines substitution eligibility between these parts?

A: Substitution is based on matching resistance value, tolerance, composition, temperature coefficient, operating temperature range, and compliance certifications. The power rating difference (0.125W to 0.25W) represents an upgrade that maintains backward compatibility. Packaging format differences do not affect electrical substitution.