RNF12FTC4M99 Equivalent & Substitute Parts

Part Overview

The RNF12FTC4M99 is a 4.99 MOhms ±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 high resistance values with tight tolerance specifications. The part is currently in active production status with 832 units available in inventory. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility can be maintained across different manufacturers while preserving functional performance in target applications.

Substiute Parts

RNF12FTC4M99

Stackpole Electronics IncIn Stock: 845RNF12FTC4M99 Datasheet

Current PartRFQ

CMF554M9900FHEB

Vishay DaleIn Stock: 7482CMF554M9900FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF12FTC4M99 is determined by the following critical parameters:

• Resistance Value: Must be 4.99 MOhms
• Tolerance: Must be ±1%
• Power Rating: Must be 0.5W (1/2W)
• Composition: Must be Metal Film
• Temperature Coefficient: Must be ±50ppm/°C
• Package Type: Must be Axial
• Compliance: Must maintain ROHS3 compliance

The CMF554M9900FHEB from Vishay Dale meets all these core electrical and mechanical requirements. Both parts share identical resistance, tolerance, power rating, composition, and temperature coefficient specifications. The axial package configuration ensures mechanical compatibility in through-hole applications. Both parts maintain ROHS3 compliance and are suitable for equivalent circuit performance.

Parameter Comparison

Engineering Selection Recommendations

Both the RNF12FTC4M99 and CMF554M9900FHEB are active production components with full ROHS3 compliance and REACH unaffected status. The CMF554M9900FHEB provides an extended operating temperature range to 175°C compared to the RNF12FTC4M99 at 155°C, and includes moisture resistant features. Selection between these parts should be based on application-specific temperature requirements and environmental exposure conditions. Both parts satisfy identical electrical specifications for resistance, tolerance, power rating, and temperature coefficient, ensuring functional equivalence in standard circuit applications.

Frequently Asked Questions (FAQ)

Q: Can the CMF554M9900FHEB replace the RNF12FTC4M99 in all applications?

A: Yes, the CMF554M9900FHEB meets all core electrical specifications (4.99 MOhms ±1%, 0.5W, ±50ppm/°C) and maintains the same axial package configuration. The extended temperature range and moisture resistant features of the CMF554M9900FHEB provide additional capability without compromising compatibility.

Q: What are the physical dimension differences between these parts?

A: The RNF12FTC4M99 measures 0.108" Dia x 0.344" L (2.75mm x 8.75mm). The CMF554M9900FHEB measures 0.090" Dia x 0.240" L (2.29mm x 6.10mm). Both are axial package resistors suitable for through-hole mounting, though the CMF554M9900FHEB is physically smaller.

Q: Are both parts compliant with current regulatory requirements?

A: Yes, both the RNF12FTC4M99 and CMF554M9900FHEB are ROHS3 compliant and REACH unaffected, meeting current regulatory standards for electronic components.

Q: What is the difference in packaging format?

A: The RNF12FTC4M99 is supplied in Tape & Reel (TR) format, while the CMF554M9900FHEB is supplied in Cut Tape (CT) format. Both formats are standard for through-hole resistor distribution and do not affect component functionality.

Q: How do the temperature coefficients compare?

A: Both parts have identical temperature coefficients of ±50ppm/°C, ensuring equivalent frequency stability and temperature-dependent performance characteristics across the specified operating ranges.