RNF18FTC1M20 Equivalent & Substitute Parts

Part Overview

The RNF18FTC1M20 is a 1.2 MOhm ±1% metal film axial resistor rated at 0.125W (1/8W) with flame retardant coating, manufactured by Stackpole Electronics Inc. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The part features safety-rated construction suitable for industrial and consumer electronics requiring reliable high-resistance performance in compact form factors.

Substiute Parts

RNF18FTC1M20

Stackpole Electronics IncIn Stock: 712RNF18FTC1M20 Datasheet

Current PartRFQ

HVR3700001204FR500

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 61610HVR3700001204FR500 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the RNF18FTC1M20 is determined by the following critical parameters:

• Resistance Value: Must be 1.2 MOhms
• Tolerance: Must be ±1% or tighter
• Composition: Metal film construction required
• Package: Axial through-hole configuration
• Operating Temperature Range: Must support -55°C ~ 155°C minimum
• Compliance: ROHS3 compliance required

The HVR3700001204FR500 qualifies as a direct substitute based on matching resistance, tolerance, composition, package type, temperature range, and regulatory compliance. The higher power rating (0.5W vs. 0.125W) and increased physical dimensions represent design improvements that maintain backward compatibility while providing enhanced performance margin.

Parameter Comparison

Engineering Selection Recommendations

The HVR3700001204FR500 is the manufacturer-recommended substitute for the obsolete RNF18FTC1M20. Both components maintain identical electrical specifications for resistance value and tolerance, ensuring functional equivalence in circuit applications. The substitute part is currently in active production status with substantial inventory availability (61,523 pcs), providing supply chain continuity.

Both parts satisfy ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for industrial and consumer applications. The substitute's higher power rating and enhanced pulse withstanding capability provide additional design margin without compromising the original circuit function. The increased physical dimensions of the substitute must be evaluated for PCB layout compatibility in space-constrained applications.

Frequently Asked Questions (FAQ)

Q: Can the HVR3700001204FR500 directly replace the RNF18FTC1M20 in all applications?

A: Yes, for electrical function. The substitute matches the critical parameters: 1.2 MOhm resistance, ±1% tolerance, metal film composition, axial package, and operating temperature range. Physical dimensions differ (larger substitute), requiring PCB layout verification.

Q: What is the significance of the power rating difference (0.125W vs. 0.5W)?

A: The substitute's higher power rating provides additional thermal margin and pulse withstanding capability. In applications where the original 0.125W rating was adequate, the 0.5W substitute operates with reduced stress, improving reliability.

Q: Does the temperature coefficient difference affect substitution suitability?

A: The substitute's ±200ppm/°C coefficient is higher than the original ±50ppm/°C. Both maintain the same operating temperature range (-55°C ~ 155°C). Circuit designs relying on the tighter temperature coefficient of the original part require evaluation.

Q: Are there packaging considerations for board assembly?

A: Yes. The substitute is larger (4.00mm x 10.00mm vs. 1.80mm x 3.30mm). Verify PCB footprint spacing and component placement clearances before implementation.

Q: What is the inventory status for the substitute part?

A: The HVR3700001204FR500 is in active production with 61,523 pcs available, ensuring reliable supply compared to the obsolete original part.