RNF12FTC4K75 Equivalent & Substitute Parts

Part Overview

The RNF12FTC4K75 is a 4.75 kOhms ±1% metal film axial through-hole resistor rated at 0.5W (1/2W) manufactured by Stackpole Electronics Inc. This component features flame retardant coating and safety-grade construction, designed for applications requiring precision resistance with thermal stability across industrial temperature ranges. The part maintains Active product status with 709 units in current inventory. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility for direct circuit board replacement.

Substiute Parts

RNF12FTC4K75

Stackpole Electronics IncIn Stock: 748RNF12FTC4K75 Datasheet

Current PartRFQ

CMF554K7500FHEB

Vishay DaleIn Stock: 2585CMF554K7500FHEB Datasheet

MFR RecommendedRFQ

CMF554K7500FHEK

Vishay DaleIn Stock: 1990CMF554K7500FHEK Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF12FTC4K75 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Resistance value: 4.75 kOhms
• Tolerance: ±1%
• Power rating: 0.5W (1/2W)
• Composition: Metal Film
• Package: Axial through-hole
• Temperature coefficient: ±50ppm/°C
• Compliance: ROHS3 Compliant, REACH Unaffected

The identified substitutes (CMF554K7500FHEB and CMF554K7500FHEK) from Vishay Dale meet all critical electrical specifications. Both parts maintain the same resistance, tolerance, power rating, and temperature coefficient. The operating temperature range of the substitutes extends to 175°C (versus 155°C for the main part), providing enhanced thermal capability. Physical dimensions differ slightly (0.090" Dia x 0.240" L for substitutes versus 0.108" Dia x 0.344" L for the main part), but both maintain standard axial package geometry compatible with through-hole PCB layouts. Packaging format differs (Cut Tape and Bulk for substitutes versus Tape & Reel for the main part) but does not affect electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain Active product status and full ROHS3 compliance with REACH Unaffected designation. The RNF12FTC4K75 and both CMF substitutes are functionally equivalent for applications requiring 4.75 kOhms ±1% metal film axial resistors at 0.5W power dissipation.

The Vishay Dale CMF554K7500FHEB and CMF554K7500FHEK substitutes provide extended operating temperature capability to 175°C and include moisture-resistant features in addition to flame retardant coating. These characteristics may provide enhanced reliability in humid or thermally demanding environments compared to the base RNF12FTC4K75 specification.

Selection between CMF554K7500FHEB (Cut Tape packaging) and CMF554K7500FHEK (Bulk packaging) depends on procurement and assembly requirements rather than electrical performance. Both deliver identical electrical and thermal characteristics.

Frequently Asked Questions (FAQ)

Q: Can CMF554K7500FHEB or CMF554K7500FHEK be used as direct replacements for RNF12FTC4K75?

A: Yes. All three parts share identical resistance (4.75 kOhms), tolerance (±1%), power rating (0.5W), composition (metal film), temperature coefficient (±50ppm/°C), and axial package geometry. Electrical performance and PCB footprint compatibility are maintained.

Q: What are the physical dimension differences between the main part and substitutes?

A: The RNF12FTC4K75 measures 0.108" Dia x 0.344" L (2.75mm x 8.75mm). The CMF substitutes measure 0.090" Dia x 0.240" L (2.29mm x 6.10mm). Both maintain standard axial through-hole package geometry. Verify PCB layout clearances if space constraints exist.

Q: Do the substitute parts offer any performance advantages?

A: The CMF554K7500FHEB and CMF554K7500FHEK extend the operating temperature range to 175°C (compared to 155°C for the RNF12FTC4K75) and include moisture-resistant features. These characteristics provide enhanced environmental protection without changing core electrical specifications.

Q: What is the difference between CMF554K7500FHEB and CMF554K7500FHEK?

A: Both parts are electrically and mechanically identical. The difference is packaging format: CMF554K7500FHEB is supplied in Cut Tape (CT) format, while CMF554K7500FHEK is supplied in Bulk format. Selection depends on assembly process requirements and procurement volume.

Q: Are all parts RoHS compliant?

A: Yes. The RNF12FTC4K75, CMF554K7500FHEB, and CMF554K7500FHEK are all ROHS3 Compliant with REACH Unaffected status.