RNF14FTC3K40 Equivalent & Substitute Parts

Part Overview

The RNF14FTC3K40 is a 3.4 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 construction, designed for applications requiring precision resistance values with reliable performance across industrial temperature ranges. The part is currently in active production status with 889 units available in stock.

Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained within the allowed parameter tolerances for this resistor category.

Substiute Parts

RNF14FTC3K40

Stackpole Electronics IncIn Stock: 967RNF14FTC3K40 Datasheet

Current PartRFQ

CMF553K4000FHEB

Vishay DaleIn Stock: 4197CMF553K4000FHEB Datasheet

UpgradeRFQ

CMF503K4000FHEB

Vishay DaleIn Stock: 2095CMF503K4000FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14FTC3K40 are qualified based on the following criteria:

Electrical Parameters (Must Match):

• Resistance value: 3.4 kOhms
• Tolerance: ±1%
• Temperature coefficient: ±50ppm/°C
• Composition: Metal Film

Mechanical Parameters (Must Match):

• Package type: Axial through-hole
• Number of terminations: 2

Allowable Variations:

• Power rating: Equal or greater than 0.25W
• Operating temperature range: Equal or greater than -55°C ~ 155°C
• Features: Flame retardant coating and safety construction required

Compliance Requirements:

• RoHS3 Compliant
• REACH Unaffected status

Two substitute parts meet these criteria with different power ratings and enhanced operating temperature ranges.

Parameter Comparison

Engineering Selection Recommendations

CMF553K4000FHEB (Upgrade Option): This substitute provides increased power dissipation capability at 0.5W (1/2W) while maintaining identical electrical specifications. The extended operating temperature range to 175°C and moisture-resistant construction offer enhanced environmental performance. This part is suitable for applications where thermal margin or moisture exposure is a consideration. RoHS3 compliance and REACH unaffected status are maintained.

CMF503K4000FHEB (Direct Equivalent): This substitute matches the 0.25W power rating of the original part while providing identical electrical performance. The extended operating temperature range to 175°C and moisture-resistant features provide additional design margin without requiring circuit re-evaluation. RoHS3 compliance and REACH unaffected status are maintained. This part is designated as manufacturer recommended.

Both substitutes maintain full electrical and mechanical compatibility with the RNF14FTC3K40 within the specified parameter tolerances.

Frequently Asked Questions (FAQ)

Q: Can CMF553K4000FHEB replace RNF14FTC3K40 in any application? A: Yes. The CMF553K4000FHEB maintains identical resistance, tolerance, and temperature coefficient specifications. The higher power rating (0.5W vs 0.25W) is a superset capability and does not create incompatibility. Physical dimensions are comparable for axial through-hole mounting.

Q: What is the difference between the two substitute parts? A: CMF553K4000FHEB is rated at 0.5W (1/2W) power dissipation, while CMF503K4000FHEB matches the original 0.25W (1/4W) rating. Both provide extended operating temperature to 175°C and moisture-resistant construction. Selection depends on thermal design requirements and available board space.

Q: Are there packaging differences between the main part and substitutes? A: The main part is supplied in Tape & Reel (TR) packaging, while both substitutes are supplied in Cut Tape (CT) packaging. Both formats are standard for through-hole resistor distribution and do not affect component performance or mounting compatibility.

Q: Do the substitute parts meet the same compliance standards? A: Yes. Both CMF553K4000FHEB and CMF503K4000FHEB are ROHS3 compliant and REACH unaffected, matching the compliance status of RNF14FTC3K40.

Q: Can I use these substitutes in high-temperature applications? A: Both substitute parts are rated to 175°C operating temperature, compared to 155°C for the original part. This provides additional thermal margin for applications operating near the upper temperature limit.