RNF14FAC221K Equivalent & Substitute Parts

Part Overview

The RNF14FAC221K is a 221 kOhms ±1% 0.25W axial through-hole resistor manufactured by Stackpole Electronics Inc. This metal film resistor features flame retardant coating and safety construction, designed for applications requiring precision resistance values with tight tolerance specifications. The part is currently active in production with 937 units in stock. Substitute parts are identified to address inventory availability, extended operating temperature ranges, or alternative packaging requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

RNF14FAC221K

Stackpole Electronics IncIn Stock: 993RNF14FAC221K Datasheet

Current PartRFQ

CMF55221K00FHEB

Vishay DaleIn Stock: 2295CMF55221K00FHEB Datasheet

UpgradeRFQ

CMF55221K00FHEK

Vishay DaleIn Stock: 931CMF55221K00FHEK Datasheet

UpgradeRFQ

CMF50221K00FHEB

Vishay DaleIn Stock: 1071CMF50221K00FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF14FAC221K is determined by the following criteria:

Mandatory Matching Parameters:

• Resistance value: 221 kOhms
• Tolerance: ±1%
• Composition: Metal Film
• Temperature Coefficient: ±50ppm/°C
• Package Type: Axial
• RoHS Compliance: ROHS3 Compliant

Allowable Variations:

• Power rating may be equal or higher (0.25W or greater)
• Operating temperature range may be equal or extended
• Physical dimensions may vary within axial package constraints
• Packaging format (Tape & Box, Cut Tape, Bulk) may differ
• Manufacturer may differ

All identified substitutes meet these criteria and are classified as either upgrade substitutes (higher power rating) or manufacturer-recommended alternatives (equivalent power rating with enhanced features).

Parameter Comparison

Engineering Selection Recommendations

CMF55221K00FHEB (Upgrade Substitute - Cut Tape Packaging)

This part provides a direct upgrade path with doubled power rating (0.5W vs 0.25W) and extended operating temperature range (-55°C ~ 175°C vs -55°C ~ 155°C). The CMF55221K00FHEB maintains all electrical specifications and adds moisture resistance. Physical dimensions are slightly reduced. All compliance certifications match the original part. This substitute is suitable for applications requiring higher thermal headroom or extended temperature operation.

CMF55221K00FHEK (Upgrade Substitute - Bulk Packaging)

Electrically and mechanically identical to CMF55221K00FHEB with identical power rating and operating temperature range. The distinction is packaging format (Bulk vs Cut Tape). Selection between these two CMF55 variants depends on procurement and assembly workflow requirements. Both are ROHS3 compliant and active products.

CMF50221K00FHEB (Manufacturer-Recommended Substitute - Cut Tape Packaging)

This part matches the original 0.25W power rating and provides equivalent electrical performance with extended operating temperature range (-55°C ~ 175°C). The CMF50221K00FHEB features moisture resistance and maintains ROHS3 compliance. Physical dimensions are significantly smaller (0.065" Dia x 0.150" L). This substitute is recommended for space-constrained applications where the original footprint is not required.

All substitutes are active products with confirmed inventory availability and full compliance documentation.

Frequently Asked Questions (FAQ)

Q: Can CMF55221K00FHEB or CMF55221K00FHEK be used as direct replacements for RNF14FAC221K?

A: Yes. Both CMF55 variants meet all mandatory electrical parameters (221 kOhms, ±1%, metal film, ±50ppm/°C, axial package, ROHS3 compliant). The higher power rating (0.5W vs 0.25W) is an allowable upgrade. Physical dimensions are slightly smaller but remain within axial package specifications. Mounting compatibility depends on PCB layout tolerances.

Q: What is the difference between CMF55221K00FHEB and CMF55221K00FHEK?

A: These parts are electrically and mechanically identical. The only difference is packaging format: CMF55221K00FHEB is supplied in Cut Tape (CT) format, while CMF55221K00FHEK is supplied in Bulk format. Selection depends on assembly process requirements and procurement preferences.

Q: Is CMF50221K00FHEB suitable for the same applications as RNF14FAC221K?

A: CMF50221K00FHEB is suitable for applications where the original 0.25W power rating is adequate and space constraints favor a smaller footprint. The part maintains all electrical specifications and extends the operating temperature range. Physical dimensions are significantly reduced (0.065" Dia x 0.150" L vs 0.093" Dia x 0.250" L), which may require PCB layout verification.

Q: Do all substitutes maintain the same tolerance and temperature coefficient?

A: Yes. All identified substitutes maintain ±1% tolerance and ±50ppm/°C temperature coefficient, matching the original RNF14FAC221K specifications.

Q: Are there any compliance or certification differences between the main part and substitutes?

A: No. All parts are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. All are active products with confirmed inventory.

Q: What is the advantage of moisture resistance in the Vishay Dale substitutes?

A: The CMF series substitutes include moisture-resistant construction as a standard feature. This provides enhanced reliability in humid environments or applications with condensation exposure, compared to the flame retardant coating alone in the original RNF14FAC221K.