RNF14FTC40K2 Equivalent & Substitute Parts

Part Overview

The RNF14FTC40K2 is a 40.2 kOhms ±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-grade construction, designed for applications requiring precision resistance values with reliable performance across industrial temperature ranges. The part is currently active in production with 1043 units in stock. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility within specified parameter tolerances.

Key Parameters

Parameter	Value
Resistance	40.2 kOhms
Tolerance	±1%
Power Rating	0.25W (1/4W)
Composition	Metal Film
Package Type	Axial
Temperature Coefficient	±50ppm/°C
Operating Temperature Range	-55°C ~ 155°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the RNF14FTC40K2 are qualified based on the following electrical and mechanical parameters:

Critical Parameters (Must Match):

Resistance value: 40.2 kOhms
Tolerance: ±1%
Composition: Metal Film
Package type: Axial through-hole
Temperature coefficient: ±50ppm/°C
RoHS compliance: ROHS3 Compliant

Allowable Variations:

Power rating: May be equal or higher than 0.25W
Operating temperature range: May be equal or extended
Physical dimensions: May vary within axial package constraints
Packaging format: Cut Tape (CT) or Tape & Reel (TR) acceptable
Manufacturer: Alternative qualified manufacturers permitted

Two substitute parts meet these criteria: CMF5040K200FHEB (manufacturer-recommended direct equivalent) and CMF5540K200FHEB (upgraded power rating variant).

Parameter Comparison

Parameter	RNF14FTC40K2	CMF5040K200FHEB	CMF5540K200FHEB
Manufacturer	Stackpole Electronics Inc	Vishay Dale	Vishay Dale
Resistance	40.2 kOhms	40.2 kOhms	40.2 kOhms
Tolerance	±1%	±1%	±1%
Power Rating	0.25W (1/4W)	0.25W (1/4W)	0.5W (1/2W)
Composition	Metal Film	Metal Film	Metal Film
Temperature Coefficient	±50ppm/°C	±50ppm/°C	±50ppm/°C
Operating Temperature	-55°C ~ 155°C	-55°C ~ 175°C	-55°C ~ 175°C
Package Type	Axial	Axial	Axial
Size / Dimension	0.093" Dia x 0.250" L (2.35mm x 6.35mm)	0.065" Dia x 0.150" L (1.65mm x 3.81mm)	0.090" Dia x 0.240" L (2.29mm x 6.10mm)
Features	Flame Retardant Coating, Safety	Flame Retardant Coating, Moisture Resistant, Safety	Flame Retardant Coating, Moisture Resistant, Safety
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

CMF5040K200FHEB (Manufacturer-Recommended): This part is the direct electrical equivalent to the RNF14FTC40K2, matching the 0.25W power rating and maintaining identical resistance, tolerance, and temperature coefficient specifications. The extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 155°C) provides additional thermal margin. Both parts are ROHS3 compliant and active in production. The CMF5040K200FHEB includes moisture-resistant features and is available with higher inventory (2270 units). Physical dimensions are smaller, which may affect board layout compatibility.

CMF5540K200FHEB (Upgrade Option): This part provides an upgraded power rating of 0.5W (1/2W) while maintaining all other electrical parameters. Selection of this part is appropriate when circuit design permits higher power dissipation capability or when thermal margin enhancement is beneficial. The extended operating temperature range and moisture-resistant construction provide additional environmental protection. Physical dimensions are comparable to the original part. This option is suitable for applications where power derating or thermal stress reduction is desired.

Frequently Asked Questions (FAQ)

Q: Can CMF5040K200FHEB be used as a direct drop-in replacement for RNF14FTC40K2?

A: Yes. Both parts share identical electrical specifications: 40.2 kOhms ±1%, 0.25W power rating, ±50ppm/°C temperature coefficient, and ROHS3 compliance. The primary difference is physical size; CMF5040K200FHEB dimensions are smaller (0.065" Dia x 0.150" L versus 0.093" Dia x 0.250" L). Verify board layout compatibility before substitution.

Q: What is the difference between CMF5040K200FHEB and CMF5540K200FHEB?

A: The primary difference is power rating. CMF5040K200FHEB is rated at 0.25W (1/4W), matching the original part. CMF5540K200FHEB is rated at 0.5W (1/2W), providing double the power dissipation capability. All other electrical parameters are identical. Physical dimensions differ slightly between the two models.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The RNF14FTC40K2 and both substitute parts (CMF5040K200FHEB and CMF5540K200FHEB) are ROHS3 compliant and REACH unaffected.

Q: Can I use CMF5540K200FHEB in place of RNF14FTC40K2 if my circuit only requires 0.25W?

A: Yes. A higher power-rated component can be used in applications requiring lower power dissipation. The CMF5540K200FHEB will operate within specification and provides additional thermal margin. Verify physical dimensions are compatible with board layout.

Q: What packaging formats are available for these substitute parts?

A: RNF14FTC40K2 is supplied in Tape & Reel (TR) format. CMF5040K200FHEB and CMF5540K200FHEB are supplied in Cut Tape (CT) format. Both formats are suitable for automated assembly processes.

Q: Do the substitute parts have the same temperature coefficient as the original?

A: Yes. All three parts share an identical temperature coefficient of ±50ppm/°C, ensuring consistent frequency stability and resistance drift characteristics across the operating temperature range.

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