RNF14FTC140K Equivalent & Substitute Parts

Part Overview

The RNF14FTC140K is a 140 kOhm ±1% metal film axial resistor rated at 0.25W (1/4W) manufactured by Stackpole Electronics Inc. This component is designed for through-hole applications requiring precision resistance with flame retardant coating and safety features. The part maintains Active product status with 916 units in current inventory. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility allow direct replacement in circuit designs, particularly when enhanced thermal ratings or alternative packaging formats are required.

Substiute Parts

RNF14FTC140K

Stackpole Electronics IncIn Stock: 979RNF14FTC140K Datasheet

Current PartRFQ

CMF55140K00FHEB

Vishay DaleIn Stock: 1693CMF55140K00FHEB Datasheet

UpgradeRFQ

CMF50140K00FHEB

Vishay DaleIn Stock: 1098CMF50140K00FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14FTC140K are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Resistance value: 140 kOhms (exact match required)
• Tolerance: ±1% (exact match required)
• Composition: Metal Film (exact match required)
• Package: Axial through-hole (exact match required)
• Temperature Coefficient: ±50ppm/°C (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

Secondary Compatibility Parameters:

• 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 features (maintained or enhanced)

The identified substitutes CMF55140K00FHEB and CMF50140K00FHEB meet all primary criteria. CMF55140K00FHEB provides enhanced thermal capability at 0.5W (1/2W) with extended operating range to 175°C. CMF50140K00FHEB maintains identical electrical and thermal specifications to the original part while offering moisture-resistant features.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements equivalent to the original RNF14FTC140K.

CMF55140K00FHEB is suitable for applications requiring enhanced thermal dissipation capability. The 0.5W power rating provides margin above the original 0.25W specification, and the extended operating temperature range to 175°C accommodates higher ambient conditions. Moisture-resistant features provide additional environmental protection.

CMF50140K00FHEB is suitable for direct replacement in applications with identical thermal and power requirements. The 0.25W rating matches the original specification exactly, while moisture-resistant features and extended operating temperature range to 175°C offer improved reliability margins. Smaller physical dimensions (0.065" Dia x 0.150" L) may provide layout advantages in space-constrained designs.

Selection between substitutes depends on circuit thermal requirements and available board space. Both parts are Active products with current inventory availability.

Frequently Asked Questions (FAQ)

Q: Can CMF55140K00FHEB replace RNF14FTC140K in all applications?

A: CMF55140K00FHEB meets all electrical substitution criteria (140 kOhms, ±1%, metal film, ±50ppm/°C, ROHS3 compliant). The higher power rating (0.5W vs 0.25W) and extended temperature range (175°C vs 155°C) are compatible with applications designed for the original part. Physical dimensions are similar (0.090" Dia x 0.240" L vs 0.093" Dia x 0.250" L), allowing board-level compatibility.

Q: What are the key differences between CMF55140K00FHEB and CMF50140K00FHEB?

A: Both parts share identical electrical specifications (140 kOhms, ±1%, ±50ppm/°C) and extended operating temperature to 175°C. The primary difference is power rating: CMF55140K00FHEB is rated 0.5W (1/2W) with larger physical dimensions (0.090" Dia x 0.240" L), while CMF50140K00FHEB is rated 0.25W (1/4W) with smaller dimensions (0.065" Dia x 0.150" L). Both include moisture-resistant features.

Q: Are physical dimensions critical for substitution?

A: Physical dimensions must be verified against circuit board layout constraints. CMF50140K00FHEB offers the smallest footprint (0.065" Dia x 0.150" L), while CMF55140K00FHEB and RNF14FTC140K are similar in size. All three maintain axial through-hole package compatibility.

Q: Do substitute parts maintain the same compliance certifications?

A: All three parts are ROHS3 compliant and REACH unaffected. Both substitute parts maintain equivalent regulatory status to the original RNF14FTC140K.

Q: Which substitute should be selected for high-temperature applications?

A: Both CMF55140K00FHEB and CMF50140K00FHEB support operating temperatures to 175°C, exceeding the original part's 155°C maximum. Selection between them depends on power dissipation requirements: CMF55140K00FHEB for applications requiring 0.5W capability, CMF50140K00FHEB for 0.25W applications.