RNF14FTC4K42 Equivalent & Substitute Parts

Part Overview

The RNF14FTC4K42 is a 4.42 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 resistive elements in compact form factors. The part maintains Active product status with 629 units in current inventory. Substitute parts are identified to address supply chain continuity, inventory availability, or specific application requirements while maintaining electrical and mechanical compatibility within defined parameters.

Substiute Parts

RNF14FTC4K42

Stackpole Electronics IncIn Stock: 693RNF14FTC4K42 Datasheet

Current PartRFQ

CMF554K4200FHEB

Vishay DaleIn Stock: 1912CMF554K4200FHEB Datasheet

UpgradeRFQ

CMF504K4200FHEB

Vishay DaleIn Stock: 2836CMF504K4200FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14FTC4K42 are qualified based on the following electrical and mechanical parameters:

Mandatory Matching Parameters:

• Resistance value: 4.42 kOhms
• Tolerance: ±1%
• Composition: Metal Film
• Package type: Axial through-hole
• Temperature coefficient: ±50ppm/°C
• RoHS compliance: ROHS3 Compliant

Allowable Variation Parameters:

• 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

Two substitute parts meet these criteria: CMF504K4200FHEB (manufacturer-recommended, identical power rating) and CMF554K4200FHEB (upgraded power rating).

Parameter Comparison

Engineering Selection Recommendations

CMF504K4200FHEB (Manufacturer-Recommended Substitute): This part is the primary substitute option. It maintains identical electrical specifications (4.42 kOhms, ±1%, 0.25W) and temperature coefficient (±50ppm/°C) as the RNF14FTC4K42. The extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 155°C) provides additional thermal margin. Enhanced moisture resistance and ROHS3 compliance ensure regulatory alignment. Physical dimensions are smaller (0.065" Dia x 0.150" L), which may require PCB layout verification. This option is suitable for direct replacement in applications where the original power rating is sufficient.

CMF554K4200FHEB (Upgrade Substitute): This part provides identical electrical specifications with an upgraded power rating of 0.5W (1/2W), double the original 0.25W rating. The extended operating temperature range (-55°C ~ 175°C) and moisture-resistant construction offer enhanced performance margins. Larger physical dimensions (0.090" Dia x 0.240" L) require PCB footprint compatibility verification. This option is applicable when thermal headroom or power dissipation margins are design considerations, or when supply chain preference favors higher-rated components.

Both substitutes maintain ROHS3 compliance, identical resistance and tolerance specifications, and equivalent safety-grade construction. Selection between them depends on available PCB space and thermal design requirements.

Frequently Asked Questions (FAQ)

Q: Can CMF504K4200FHEB directly replace RNF14FTC4K42 without circuit modification? A: Yes. Both parts share identical electrical specifications (4.42 kOhms ±1%, 0.25W, ±50ppm/°C). PCB layout verification is required due to smaller physical dimensions (0.065" Dia x 0.150" L versus 0.093" Dia x 0.250" L). Axial lead spacing and hole positioning must be confirmed compatible.

Q: What is the difference between the two substitute parts? A: CMF504K4200FHEB maintains the original 0.25W power rating with smaller dimensions. CMF554K4200FHEB provides doubled power rating (0.5W) with slightly larger dimensions (0.090" Dia x 0.240" L). Both share identical resistance, tolerance, and temperature coefficient specifications.

Q: Are the substitute parts RoHS compliant? A: Yes. Both CMF504K4200FHEB and CMF554K4200FHEB are ROHS3 compliant, matching the RNF14FTC4K42 compliance status.

Q: What is the temperature coefficient significance? A: All three parts maintain ±50ppm/°C temperature coefficient, ensuring equivalent resistance stability across temperature variations. This parameter is critical for precision circuit applications.

Q: Can CMF554K4200FHEB be used in place of RNF14FTC4K42 in all applications? A: Electrical substitution is valid. The higher power rating (0.5W versus 0.25W) provides additional thermal margin and does not degrade circuit performance. Physical dimensions must be verified for PCB compatibility.

Q: What packaging formats are available? A: RNF14FTC4K42 is supplied in Tape & Reel (TR) format. Both substitutes (CMF504K4200FHEB and CMF554K4200FHEB) are supplied in Cut Tape (CT) format. Packaging selection depends on assembly process requirements.

Q: Are moisture-resistant features required for my application? A: Both Vishay Dale substitutes include moisture-resistant construction. The original Stackpole part specifies flame retardant coating and safety features without explicit moisture resistance. If moisture exposure is a design consideration, the substitute parts provide enhanced protection.