RNF12FTC39R2 Equivalent & Substitute Parts

Part Overview

The RNF12FTC39R2 is a 39.2 Ohm ±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 is currently in active production status with 904 units in stock inventory.

Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and regulatory compliance can be maintained while accommodating supply chain variations or packaging preferences.

Substiute Parts

RNF12FTC39R2

Stackpole Electronics IncIn Stock: 990RNF12FTC39R2 Datasheet

Current PartRFQ

CMF5539R200FHEB

Vishay DaleIn Stock: 1792CMF5539R200FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF12FTC39R2 is determined by the following critical parameters:

• Resistance value: 39.2 Ohms (exact match required)
• Tolerance: ±1% (equivalent or tighter tolerance acceptable)
• Power rating: 0.5W minimum (equal or higher acceptable)
• Composition: Metal film (maintains electrical characteristics)
• Temperature coefficient: ±50ppm/°C or better (ensures frequency stability)
• Package: Axial through-hole (mechanical compatibility)
• Regulatory compliance: ROHS3 and REACH status alignment

The CMF5539R200FHEB from Vishay Dale meets all substitution criteria with identical electrical specifications and enhanced operating temperature range (-55°C ~ 175°C), providing extended thermal performance margin.

Parameter Comparison

Engineering Selection Recommendations

Both the RNF12FTC39R2 and CMF5539R200FHEB are active production components with full ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for industrial and commercial applications.

The CMF5539R200FHEB provides an extended operating temperature ceiling of 175°C compared to 155°C for the RNF12FTC39R2, offering additional thermal margin in high-temperature environments. The Vishay Dale component also incorporates moisture-resistant features, providing enhanced environmental protection.

Physical dimensions differ slightly: the CMF5539R200FHEB measures 0.090" diameter × 0.240" length versus 0.108" diameter × 0.344" length for the RNF12FTC39R2. This dimensional variance may affect PCB layout and mechanical clearance considerations in space-constrained applications.

Packaging format differs between components: the RNF12FTC39R2 is supplied in Tape & Reel format, while the CMF5539R200FHEB is supplied in Cut Tape format. Selection should align with assembly process requirements and inventory management protocols.

Frequently Asked Questions (FAQ)

Q: Can the CMF5539R200FHEB directly replace the RNF12FTC39R2 in existing designs?

A: Yes, electrical substitution is valid. Both components share identical resistance (39.2 Ohms), tolerance (±1%), power rating (0.5W), and temperature coefficient (±50ppm/°C). Physical dimensions and packaging format differ; verify PCB layout compatibility and assembly process compatibility before implementation.

Q: What is the significance of the extended operating temperature range in the CMF5539R200FHEB?

A: The CMF5539R200FHEB operates to 175°C versus 155°C for the RNF12FTC39R2. This 20°C additional margin provides design flexibility for applications with elevated ambient temperatures or thermal stress conditions, though both components meet standard industrial temperature specifications.

Q: How do packaging formats affect component selection?

A: The RNF12FTC39R2 is supplied in Tape & Reel format suitable for high-volume automated assembly. The CMF5539R200FHEB is supplied in Cut Tape format, typically used for lower-volume or manual assembly processes. Selection should align with production volume, assembly equipment capabilities, and inventory management requirements.

Q: Are both components suitable for safety-critical applications?

A: Both components feature flame retardant coating and safety-grade construction with ROHS3 compliance. Application suitability depends on specific safety standards and certifications required by the end-use industry. Consult component datasheets and application requirements for safety-critical qualification.

Q: What is the impact of moisture-resistant features in the CMF5539R200FHEB?

A: The moisture-resistant feature in the CMF5539R200FHEB provides enhanced environmental protection in humid or corrosive atmospheres. The RNF12FTC39R2 does not specify moisture-resistant properties. Selection should consider operating environment conditions and long-term reliability requirements.