RNF12FTC3K40 Equivalent & Substitute Parts

Part Overview

The RNF12FTC3K40 is a 3.4 kOhms ±1% metal film through-hole resistor rated at 0.5W (1/2W) in axial package configuration, manufactured by Stackpole Electronics Inc. This component features flame retardant coating and safety-grade construction suitable for industrial and consumer applications requiring precision resistance values. The part maintains Active product status with 994 units in current inventory. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required due to supply constraints, design flexibility, or application-specific packaging preferences.

Substiute Parts

RNF12FTC3K40

Stackpole Electronics IncIn Stock: 1036RNF12FTC3K40 Datasheet

Current PartRFQ

CMF553K4000FHEB

Vishay DaleIn Stock: 4197CMF553K4000FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF12FTC3K40 is determined by strict equivalence across the following critical parameters:

• Resistance value: 3.4 kOhms (exact match required)
• Tolerance: ±1% (precision grade match)
• Power rating: 0.5W / 1/2W (thermal capability match)
• Composition: Metal Film (performance characteristics match)
• Package: Axial through-hole (mechanical compatibility)
• Temperature coefficient: ±50ppm/°C (stability match)
• Regulatory compliance: ROHS3 Compliant, REACH Unaffected, EAR99 classification

The CMF553K4000FHEB from Vishay Dale meets all substitution criteria. Both parts share identical electrical specifications and axial package configuration. Physical dimensions differ slightly (CMF55 series is more compact), but both are compatible with standard through-hole PCB layouts. Operating temperature range extends to 175°C for the substitute, providing enhanced thermal margin.

Parameter Comparison

Engineering Selection Recommendations

Both the RNF12FTC3K40 and CMF553K4000FHEB are Active status components meeting ROHS3 compliance and REACH regulatory requirements. Selection between these parts should be based on:

• Supply availability and lead time requirements
• PCB layout constraints (physical dimensions: RNF12FTC3K40 is 0.108" diameter × 0.344" length; CMF553K4000FHEB is 0.090" diameter × 0.240" length)
• Packaging format preference (RNF12FTC3K40 supplied in Tape & Reel; CMF553K4000FHEB supplied in Cut Tape)
• Extended temperature operation (CMF553K4000FHEB rated to 175°C versus 155°C for RNF12FTC3K40)
• Moisture resistance requirement (CMF553K4000FHEB includes moisture resistant feature)

Both parts satisfy identical electrical and safety specifications for direct substitution in axial through-hole applications.

Frequently Asked Questions (FAQ)

Q: Can CMF553K4000FHEB replace RNF12FTC3K40 in existing designs?

A: Yes. Both components share identical resistance (3.4 kOhms), tolerance (±1%), power rating (0.5W), composition (metal film), and temperature coefficient (±50ppm/°C). Axial package compatibility is maintained. Physical dimension differences are minor and compatible with standard through-hole PCB spacing.

Q: What are the physical dimension differences?

A: RNF12FTC3K40 measures 0.108" diameter × 0.344" length (2.75mm × 8.75mm). CMF553K4000FHEB measures 0.090" diameter × 0.240" length (2.29mm × 6.10mm). The substitute is more compact but maintains standard axial lead spacing for PCB compatibility.

Q: Are there differences in packaging format?

A: Yes. RNF12FTC3K40 is supplied in Tape & Reel (TR) format. CMF553K4000FHEB is supplied in Cut Tape (CT) format. Packaging selection depends on assembly process requirements and volume considerations.

Q: Does the CMF553K4000FHEB offer any performance advantages?

A: The CMF553K4000FHEB extends operating temperature range to 175°C (versus 155°C for RNF12FTC3K40) and includes moisture resistant feature. Temperature coefficient and tolerance specifications remain identical.

Q: Are both parts compliant with current regulations?

A: Yes. Both components are ROHS3 Compliant, REACH Unaffected, and classified as EAR99 for export control purposes.