RNF14FTC2K21 Equivalent & Substitute Parts

Part Overview

The RNF14FTC2K21 is a 2.21 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 with an operating temperature range of -55°C to 155°C. The part is currently active in production with 657 units in stock and carries ROHS3 compliance certification.

Substitute parts are identified when equivalent resistance values, tolerance specifications, and axial package configurations are maintained while allowing for variations in power rating, physical dimensions, and manufacturer compliance certifications.

Substiute Parts

RNF14FTC2K21

Stackpole Electronics IncIn Stock: 741RNF14FTC2K21 Datasheet

Current PartRFQ

CMF552K2100DHR6

Vishay DaleIn Stock: 1886CMF552K2100DHR6 Datasheet

UpgradeRFQ

CMF552K2100FHEB

Vishay DaleIn Stock: 15758CMF552K2100FHEB Datasheet

UpgradeRFQ

CMF502K2100FHEB

Vishay DaleIn Stock: 3629CMF502K2100FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Core Electrical Parameters (Non-Negotiable):

• Resistance value: 2.21 kOhms
• Tolerance: ±1% or better (lower tolerance values are acceptable)
• Composition: Metal Film
• Temperature Coefficient: ±50ppm/°C
• Package: Axial through-hole

Allowable Variations:

• Power rating: Equal to or greater than 0.25W
• Physical dimensions: May vary within axial package constraints
• Operating temperature range: May extend beyond -55°C to 155°C
• Manufacturer: Different manufacturers acceptable
• Packaging format: Tape & Reel or Cut Tape acceptable
• Compliance certifications: ROHS3 or equivalent standards

The three identified substitute parts (CMF552K2100DHR6, CMF552K2100FHEB, CMF502K2100FHEB) maintain all core electrical parameters while offering enhanced power ratings, improved tolerance specifications, or extended temperature ranges.

Parameter Comparison

Engineering Selection Recommendations

CMF502K2100FHEB (Manufacturer Recommended): This part is designated as the manufacturer-recommended substitute. It maintains identical power rating (0.25W) and tolerance (±1%) to the RNF14FTC2K21 while offering extended operating temperature range (-55°C to 175°C), improved moisture resistance, and ROHS3 compliance. Physical dimensions are reduced (0.065" Dia x 0.150" L versus 0.093" Dia x 0.250" L), which may provide layout advantages in space-constrained applications. This option is preferred for direct replacement in new designs or production runs requiring ROHS3 certification.

CMF552K2100FHEB (Upgrade Option): This substitute provides doubled power rating (0.5W versus 0.25W) while maintaining ±1% tolerance and ROHS3 compliance. Extended operating temperature range and moisture resistance are included. Larger physical dimensions (0.090" Dia x 0.240" L) require verification of PCB layout compatibility. This option is suitable for applications requiring thermal margin or higher dissipation capacity. Highest inventory availability (15742 units) supports production continuity.

CMF552K2100DHR6 (Enhanced Tolerance Option): This substitute offers superior tolerance specification (±0.5% versus ±1%), doubled power rating (0.5W), and extended temperature range (-55°C to 175°C). However, RoHS non-compliance status requires evaluation against project regulatory requirements. This option is applicable only in applications where RoHS3 certification is not mandated. Physical dimensions are comparable to CMF552K2100FHEB.

Frequently Asked Questions (FAQ)

Q: Can CMF502K2100FHEB be used as a direct replacement for RNF14FTC2K21?

A: Yes. CMF502K2100FHEB maintains identical resistance value (2.21 kOhms), tolerance (±1%), power rating (0.25W), and axial package configuration. It is designated as the manufacturer-recommended substitute. Physical dimensions are smaller, which may require PCB layout verification but does not affect electrical compatibility.

Q: What is the difference between the two Vishay Dale 1/2W options (CMF552K2100DHR6 and CMF552K2100FHEB)?

A: Both parts share identical resistance, power rating (0.5W), and temperature range. The primary difference is tolerance specification: CMF552K2100DHR6 offers ±0.5% tolerance versus ±1% for CMF552K2100FHEB. Additionally, CMF552K2100DHR6 is RoHS non-compliant while CMF552K2100FHEB carries ROHS3 certification. Selection depends on tolerance requirements and regulatory compliance mandates.

Q: Are there physical dimension constraints when substituting with higher power-rated parts?

A: Yes. The 1/2W options (CMF552K2100DHR6 and CMF552K2100FHEB) have slightly different dimensions (0.090" Dia x 0.240" L) compared to the original 1/4W part (0.093" Dia x 0.250" L). While differences are minimal, PCB layout and component spacing must be verified to ensure mechanical fit, particularly in high-density assemblies.

Q: Does the RNF14FTC2K21 require ROHS3 compliance for my application?

A: Compliance requirements depend on your application and market regulations. The RNF14FTC2K21 is ROHS3 compliant. If ROHS3 certification is required, CMF502K2100FHEB and CMF552K2100FHEB are compliant substitutes. CMF552K2100DHR6 is RoHS non-compliant and should not be used in applications with mandatory ROHS3 requirements.

Q: What is the advantage of the moisture-resistant feature in Vishay Dale substitutes?

A: All three Vishay Dale substitutes include moisture-resistant construction in addition to flame retardant coating. This feature provides enhanced reliability in humid or high-moisture environments. The RNF14FTC2K21 does not specify moisture resistance. If your application involves moisture exposure, the Vishay Dale options offer improved environmental protection.

Q: Can I use CMF552K2100DHR6 if my design only requires 1/4W power dissipation?

A: Yes. The 0.5W power rating of CMF552K2100DHR6 exceeds the 0.25W requirement, providing thermal margin and improved reliability. However, RoHS compliance status must be verified against project requirements before selection.