RNF14FTD191R Equivalent & Substitute Parts

Part Overview

The RNF14FTD191R is a 191 Ohm ±1% metal film axial through-hole resistor rated at 0.25W (1/4W) manufactured by Stackpole Electronics Inc. This component is designed for general-purpose applications requiring precision resistance with flame retardant coating and safety features. The part maintains Active product status with 802 units in current inventory. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, procurement lead times, or design optimization needs.

Substiute Parts

RNF14FTD191R

Stackpole Electronics IncIn Stock: 910RNF14FTD191R Datasheet

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CMF55191R00FHEB

Vishay DaleIn Stock: 1428CMF55191R00FHEB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF14FTD191R is determined by the following criteria:

Mandatory Matching Parameters:

• Resistance value: 191 Ohms
• Tolerance: ±1%
• Composition: Metal Film
• Package type: Axial through-hole configuration
• RoHS compliance: ROHS3 Compliant

Allowable Variations:

• Power rating: Equal to or greater than 0.25W
• Operating temperature range: Must encompass or exceed -55°C ~ 155°C
• Temperature coefficient: May be equal to or lower (more stable)
• Physical dimensions: Minor variations acceptable within axial package constraints
• Packaging format: Cut Tape (CT) or Tape & Reel (TR) formats are interchangeable for component selection

The CMF55191R00FHEB qualifies as a direct substitute based on matching resistance, tolerance, composition, and package type, with enhanced specifications in power rating (0.5W vs 0.25W) and operating temperature range (-55°C ~ 175°C vs -55°C ~ 155°C).

Parameter Comparison

Engineering Selection Recommendations

The CMF55191R00FHEB is a qualified substitute for the RNF14FTD191R based on the following engineering criteria:

Electrical Equivalence: Both components provide identical resistance (191 Ohms) and tolerance (±1%), ensuring equivalent electrical performance in circuit applications.

Compliance Status: Both parts maintain ROHS3 compliance and REACH Unaffected status, satisfying regulatory requirements for equivalent component selection.

Enhanced Specifications: The CMF55191R00FHEB offers superior performance characteristics including doubled power rating (0.5W vs 0.25W), extended operating temperature range (-55°C ~ 175°C vs -55°C ~ 155°C), and improved temperature stability (±50ppm/°C vs ±100ppm/°C).

Physical Compatibility: Axial package dimensions are comparable and suitable for standard through-hole PCB layouts. The substitute exhibits slightly reduced physical dimensions, which presents no compatibility constraints for typical circuit board designs.

Procurement Consideration: The CMF55191R00FHEB maintains higher inventory availability (1344 units vs 802 units), supporting supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the CMF55191R00FHEB replace the RNF14FTD191R in all applications?

A: Yes, the CMF55191R00FHEB is electrically and mechanically compatible as a direct substitute. The identical resistance value, tolerance, and metal film composition ensure equivalent circuit performance. The enhanced power rating and extended temperature range provide additional operational margin without introducing compatibility issues.

Q: What is the significance of the different power ratings (0.25W vs 0.5W)?

A: The power rating indicates the maximum power dissipation capability. The CMF55191R00FHEB's 0.5W rating provides double the thermal capacity of the RNF14FTD191R's 0.25W rating. This allows the substitute to operate safely in applications with higher power dissipation requirements or elevated ambient temperatures without thermal stress.

Q: Are the physical dimensions compatible with existing PCB layouts?

A: Yes. Both components use axial through-hole packaging with comparable dimensions. The CMF55191R00FHEB exhibits slightly smaller dimensions (0.090" Dia x 0.240" L vs 0.093" Dia x 0.250" L), which presents no interference or mounting constraints for standard circuit board designs.

Q: What does the temperature coefficient difference mean for circuit performance?

A: The temperature coefficient (±100ppm/°C vs ±50ppm/°C) indicates resistance value drift over temperature changes. The CMF55191R00FHEB's lower coefficient provides improved stability, meaning the resistance value remains closer to the nominal 191 Ohms across the operating temperature range. This is advantageous for precision applications.

Q: Are both parts RoHS compliant?

A: Yes. Both the RNF14FTD191R and CMF55191R00FHEB are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic component manufacturing and use.

Q: What packaging formats are available for these parts?

A: The RNF14FTD191R is supplied in Tape & Reel (TR) format, while the CMF55191R00FHEB is available in Cut Tape (CT) format. Both formats are standard for through-hole component distribution and are compatible with typical component handling and assembly processes.