RNF12FTD4K99 Equivalent & Substitute Parts

Part Overview

The RNF12FTD4K99 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 in compact axial packages. The part is currently active in production with 827 units in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the allowed parameter range.

Substiute Parts

RNF12FTD4K99

Stackpole Electronics IncIn Stock: 875RNF12FTD4K99 Datasheet

Current PartRFQ

CMF554K9900FKEB

Vishay DaleIn Stock: 6197CMF554K9900FKEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF12FTD4K99 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: ±100ppm/°C (exact match required)
• Regulatory compliance: ROHS3 Compliant, REACH Unaffected, EAR99 classification

The CMF554K9900FKEB 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 RNF12FTD4K99 and CMF554K9900FKEB are active production parts with full ROHS3 compliance and REACH unaffected status. The CMF554K9900FKEB provides an extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 155°C) and includes moisture resistant features in addition to flame retardant coating. Selection between these parts depends on application-specific temperature requirements and environmental exposure conditions. Both parts satisfy identical electrical and mechanical substitution criteria for standard circuit applications.

Frequently Asked Questions (FAQ)

Q: Can the CMF554K9900FKEB directly replace the RNF12FTD4K99 in existing designs?

A: Yes. Both parts share identical resistance (4.99 kOhms), tolerance (±1%), power rating (0.5W), composition (metal film), temperature coefficient (±100ppm/°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 RNF12FTD4K99 measures 0.108" diameter × 0.344" length (2.75mm × 8.75mm). The CMF554K9900FKEB measures 0.090" diameter × 0.240" length (2.29mm × 6.10mm). The substitute part is physically smaller while maintaining equivalent electrical performance.

Q: Are there packaging differences between these parts?

A: The RNF12FTD4K99 is supplied in Tape & Reel (TR) packaging. The CMF554K9900FKEB is supplied in Cut Tape (CT) packaging. Both are standard through-hole axial resistor formats suitable for automated assembly.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both parts are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. Both carry identical HTSUS classification (8533.21.0090).

Q: What is the temperature range difference, and does it matter for my application?

A: The RNF12FTD4K99 operates from -55°C to 155°C. The CMF554K9900FKEB operates from -55°C to 175°C. The substitute part supports a 20°C higher maximum temperature. Selection depends on whether your application requires operation above 155°C.