RNF12FTC665K Equivalent & Substitute Parts

Part Overview

The RNF12FTC665K is a 665 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 ROHS3 compliance. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the allowed parameter range for this resistor category.

Substiute Parts

RNF12FTC665K

Stackpole Electronics IncIn Stock: 920RNF12FTC665K Datasheet

Current PartRFQ

CMF55665K00FHEB

Vishay DaleIn Stock: 1328CMF55665K00FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF12FTC665K is determined by strict equivalence across the following critical parameters:

• Resistance value: 665 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 (minimum requirement)

The CMF55665K00FHEB from Vishay Dale meets all substitution criteria. Both parts share identical electrical specifications and axial package configuration. Physical dimensions differ slightly, but both maintain standard axial form factor compatibility with typical PCB layouts designed for 1/2W axial resistors.

Parameter Comparison

Engineering Selection Recommendations

Both the RNF12FTC665K and CMF55665K00FHEB are active production parts with ROHS3 compliance and REACH unaffected status. Selection between these parts should be based on:

• Packaging availability: RNF12FTC665K is supplied in Tape & Reel format; CMF55665K00FHEB is supplied in Cut Tape format
• Operating temperature ceiling: CMF55665K00FHEB supports operation to 175°C versus 155°C for RNF12FTC665K
• Moisture resistance: CMF55665K00FHEB includes moisture resistant construction
• Physical dimensions: CMF55665K00FHEB is slightly smaller (0.090" Dia x 0.240" L versus 0.108" Dia x 0.344" L)

Both parts satisfy the core electrical and mechanical requirements for 665 kOhms ±1% 0.5W axial metal film resistor applications.

Frequently Asked Questions (FAQ)

Q: Can CMF55665K00FHEB be used as a direct replacement for RNF12FTC665K?

A: Yes. Both parts share identical resistance, tolerance, power rating, temperature coefficient, and metal film composition. The axial package configuration is compatible with standard PCB layouts. Physical dimension differences are within acceptable tolerances for typical through-hole resistor applications.

Q: What is the difference in operating temperature range?

A: RNF12FTC665K operates from -55°C to 155°C. CMF55665K00FHEB operates from -55°C to 175°C. For applications requiring operation above 155°C, CMF55665K00FHEB is the appropriate selection.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel (TR) and Cut Tape (CT) packaging formats do not affect electrical characteristics. Selection depends on assembly process requirements and inventory management practices.

Q: Are both parts RoHS compliant?

A: Yes. Both RNF12FTC665K and CMF55665K00FHEB are ROHS3 compliant and REACH unaffected.

Q: What is the significance of moisture resistant construction in CMF55665K00FHEB?

A: Moisture resistant construction provides enhanced protection in high-humidity environments. This feature is beneficial for applications exposed to condensation or elevated moisture conditions, though both parts are suitable for standard industrial environments.