RNF14FTC649R Equivalent & Substitute Parts

Part Overview

The RNF14FTC649R is a 649 Ohm ±1% metal film axial through-hole resistor rated at 0.25W (1/4W) manufactured by Stackpole Electronics Inc. This component features flame retardant coating and safety construction, designed for applications requiring precision resistance values with reliable performance across industrial temperature ranges. The part maintains Active product status with ROHS3 compliance and is suitable for direct integration into electronic assemblies where equivalent electrical and mechanical specifications are required.

Substiute Parts

RNF14FTC649R

Stackpole Electronics IncIn Stock: 5845RNF14FTC649R Datasheet

Current PartRFQ

CMF55649R00FHEB

Vishay DaleIn Stock: 2027CMF55649R00FHEB Datasheet

UpgradeRFQ

CMF50649R00FHEB

Vishay DaleIn Stock: 1607CMF50649R00FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF14FTC649R is determined by the following critical parameters:

Mandatory Matching Parameters:

• Resistance value: 649 Ohms
• Tolerance: ±1%
• Composition: Metal Film
• Package type: Axial through-hole
• Temperature coefficient: ±50ppm/°C
• RoHS compliance: ROHS3 Compliant

Allowable Variation Parameters:

• Power rating: Equal or higher than 0.25W
• Operating temperature range: Equal or higher upper limit than 155°C
• Physical dimensions: Axial package form factor maintained
• Features: Flame retardant coating and safety construction maintained or enhanced

Two substitute parts meet these criteria:

CMF55649R00FHEB (Vishay Dale): Upgrade substitute with 0.5W power rating and extended operating temperature to 175°C.

CMF50649R00FHEB (Vishay Dale): Direct equivalent with matching 0.25W power rating and extended operating temperature to 175°C.

Parameter Comparison

Engineering Selection Recommendations

CMF50649R00FHEB is the manufacturer-recommended direct equivalent. This Vishay Dale part maintains identical electrical specifications (649 Ohms ±1%, 0.25W) and package configuration while providing extended operating temperature capability to 175°C and enhanced moisture resistance. Selection of this part introduces no circuit redesign requirements and maintains full compatibility with existing PCB layouts and assembly processes.

CMF55649R00FHEB functions as an upgrade substitute where thermal margin or power dissipation headroom is beneficial. The doubled power rating (0.5W versus 0.25W) and extended temperature range support applications with higher ambient temperatures or increased component stress. Physical dimensions differ slightly; verification of PCB footprint clearance is necessary prior to implementation.

Both substitute parts maintain ROHS3 compliance, flame retardant construction, and safety features equivalent to or exceeding the original specification. All three parts are Active products with confirmed inventory availability.

Frequently Asked Questions (FAQ)

Q: Can CMF55649R00FHEB be used as a direct drop-in replacement for RNF14FTC649R?

A: CMF55649R00FHEB is electrically compatible but requires physical verification. The 0.5W rating and extended temperature range are backward-compatible advantages. However, the physical dimensions differ (0.090" Dia x 0.240" L versus 0.093" Dia x 0.250" L). Confirm PCB footprint spacing and component clearance before assembly.

Q: What is the difference between the two Vishay Dale substitutes?

A: CMF50649R00FHEB matches the original 0.25W power rating and provides the closest electrical and physical equivalence. CMF55649R00FHEB offers doubled power capacity (0.5W) with slightly different dimensions, suitable for applications requiring additional thermal margin or operating in higher temperature environments.

Q: Are all three parts suitable for high-temperature applications?

A: The RNF14FTC649R operates to 155°C. Both Vishay Dale substitutes extend this to 175°C, providing 20°C additional margin. For applications approaching or exceeding 155°C, the substitute parts offer improved reliability.

Q: Do the substitute parts maintain the same moisture resistance as the original?

A: The RNF14FTC649R specifies flame retardant coating and safety construction. Both CMF series substitutes add explicit moisture resistance in addition to flame retardant properties, providing enhanced environmental protection.

Q: Is PCB layout modification required when switching to a substitute part?

A: CMF50649R00FHEB requires no layout changes due to compatible axial package dimensions. CMF55649R00FHEB has slightly smaller dimensions and may allow tighter component spacing, but existing layouts accommodate both without modification.

Q: Are all parts RoHS compliant?

A: Yes. RNF14FTC649R, CMF55649R00FHEB, and CMF50649R00FHEB all maintain ROHS3 compliance status.