RNF12FTC4K99 Equivalent & Substitute Parts

Part Overview

The RNF12FTC4K99 is a 4.99 kOhms ±1% 0.5W through-hole axial resistor manufactured by Stackpole Electronics Inc. This metal film resistor features flame retardant coating and safety construction, designed for applications requiring precision resistance values with stable performance across industrial temperature ranges. The part is currently active in production with 770 pieces available in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the same resistance value, tolerance, power rating, and package type.

Substiute Parts

RNF12FTC4K99

Stackpole Electronics IncIn Stock: 851RNF12FTC4K99 Datasheet

Current PartRFQ

CMF554K9900FHEB

Vishay DaleIn Stock: 11525CMF554K9900FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF12FTC4K99 is determined by strict equivalence across the following critical parameters:

• Resistance value: 4.99 kOhms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 0.5W / 1/2W (exact match required)
• Composition: Metal Film (exact match required)
• Package: Axial through-hole (exact match required)
• Temperature coefficient: ±50ppm/°C (exact match required)
• Regulatory compliance: ROHS3 Compliant, REACH Unaffected (minimum requirement)

The CMF554K9900FHEB from Vishay Dale meets all substitution criteria. Both parts share identical electrical specifications and axial package configuration, enabling direct functional replacement in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Both the RNF12FTC4K99 and CMF554K9900FHEB are active production parts with full ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for industrial and commercial applications. The CMF554K9900FHEB provides an extended operating temperature range to 175°C compared to 155°C for the RNF12FTC4K99, and includes moisture resistant properties in addition to flame retardant coating. Selection between these parts depends on application-specific temperature requirements and packaging format availability. The CMF554K9900FHEB is supplied in Cut Tape format with higher inventory availability (11,478 pieces), while the RNF12FTC4K99 is supplied in Tape & Reel format.

Frequently Asked Questions (FAQ)

Q: Can the CMF554K9900FHEB directly replace the RNF12FTC4K99 in existing designs?

A: Yes. Both parts share identical resistance (4.99 kOhms), tolerance (±1%), power rating (0.5W), composition (metal film), temperature coefficient (±50ppm/°C), and axial package configuration. Direct substitution is electrically and mechanically compatible.

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

A: The RNF12FTC4K99 measures 0.108" diameter × 0.344" length (2.75mm × 8.75mm). The CMF554K9900FHEB measures 0.090" diameter × 0.240" length (2.29mm × 6.10mm). The CMF part is physically smaller while maintaining equivalent electrical performance.

Q: Are there packaging format differences?

A: Yes. The RNF12FTC4K99 is supplied in Tape & Reel (TR) format, while the CMF554K9900FHEB is supplied in Cut Tape (CT) format. Selection depends on assembly process requirements and volume needs.

Q: What is the temperature operating range difference?

A: The RNF12FTC4K99 operates from -55°C to 155°C. The CMF554K9900FHEB operates from -55°C to 175°C, providing a 20°C higher maximum temperature capability.

Q: Do both parts meet current regulatory compliance standards?

A: Yes. Both parts are ROHS3 compliant and REACH unaffected, meeting current environmental and safety regulations for electronic component manufacturing and use.