RNF14FAD221R Equivalent & Substitute Parts

Part Overview

The RNF14FAD221R is a 221 Ohm ±1% metal film axial through-hole resistor rated at 0.25W (1/4W) manufactured by Stackpole Electronics Inc. This component is actively produced and widely used in general-purpose electronic circuits requiring precision resistive elements with flame retardant coating and safety features. Substitute parts are identified to address inventory availability, packaging format requirements, or enhanced performance specifications while maintaining core electrical compatibility.

Key Parameters

Parameter	Value
Resistance	221 Ohms
Tolerance	±1%
Power Rating	0.25W (1/4W)
Composition	Metal Film
Package Type	Axial
Operating Temperature Range	-55°C ~ 155°C
Temperature Coefficient	±100ppm/°C
Features	Flame Retardant Coating, Safety
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the RNF14FAD221R are classified into two categories based on allowed parameter variations:

Direct Substitute (Same Electrical Specifications):

RNF14FTD221R: Identical electrical specifications and performance characteristics. Difference limited to packaging format (Cut Tape vs. Tape & Box).

Upgrade Substitutes (Enhanced Specifications):

CMF55221R00DHR6: Higher power rating (0.5W vs. 0.25W), improved tolerance (±0.5% vs. ±1%), lower temperature coefficient (±50ppm/°C vs. ±100ppm/°C), extended operating temperature (-55°C ~ 175°C vs. -55°C ~ 155°C), moisture resistant feature added.
CMF55221R00FHEB: Higher power rating (0.5W vs. 0.25W), same tolerance (±1%), lower temperature coefficient (±50ppm/°C vs. ±100ppm/°C), extended operating temperature (-55°C ~ 175°C vs. -55°C ~ 155°C), moisture resistant feature added, ROHS3 compliant.
CMF55221R00FHEK: Identical specifications to CMF55221R00FHEB with packaging format variation (Bulk vs. Cut Tape).
CPF1221R00FKEE6: Significantly higher power rating (1W vs. 0.25W), same tolerance (±1%), same temperature coefficient (±100ppm/°C), extended operating temperature (-65°C ~ 230°C vs. -55°C ~ 155°C), flame proof feature (enhanced from flame retardant), moisture resistant feature added.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power Rating	Temp Coefficient	Operating Temp Range	RoHS Status	Packaging
RNF14FAD221R	Stackpole Electronics Inc	221 Ohms	±1%	0.25W	±100ppm/°C	-55°C ~ 155°C	ROHS3 Compliant	Tape & Box
RNF14FTD221R	Stackpole Electronics Inc	221 Ohms	±1%	0.25W	±100ppm/°C	-55°C ~ 155°C	ROHS3 Compliant	Cut Tape
CMF55221R00DHR6	Vishay Dale	221 Ohms	±0.5%	0.5W	±50ppm/°C	-55°C ~ 175°C	RoHS non-compliant	Cut Tape
CMF55221R00FHEB	Vishay Dale	221 Ohms	±1%	0.5W	±50ppm/°C	-55°C ~ 175°C	ROHS3 Compliant	Cut Tape
CMF55221R00FHEK	Vishay Dale	221 Ohms	±1%	0.5W	±50ppm/°C	-55°C ~ 175°C	ROHS3 Compliant	Bulk
CPF1221R00FKEE6	Vishay Dale	221 Ohms	±1%	1W	±100ppm/°C	-65°C ~ 230°C	ROHS3 Compliant	Cut Tape

Engineering Selection Recommendations

For Direct Replacement (Identical Performance): Select RNF14FTD221R when packaging format change from Tape & Box to Cut Tape is acceptable. Both parts maintain identical electrical specifications and ROHS3 compliance.

For Enhanced Thermal Performance: CMF55221R00FHEB or CMF55221R00FHEK provide improved temperature stability (±50ppm/°C vs. ±100ppm/°C) and extended operating temperature range (-55°C ~ 175°C). Both maintain ROHS3 compliance and ±1% tolerance matching the original specification. Select FHEB for Cut Tape packaging or FHEK for Bulk packaging.

For Higher Power Dissipation Applications: CPF1221R00FKEE6 offers 1W power rating with extended temperature range (-65°C ~ 230°C) and flame proof rating. ROHS3 compliant. Suitable for applications requiring higher thermal headroom.

For Precision Applications with RoHS Compliance: CMF55221R00DHR6 provides ±0.5% tolerance and ±50ppm/°C temperature coefficient. Note: This part is RoHS non-compliant and REACH affected, limiting use in regulated applications.

Frequently Asked Questions (FAQ)

Q: Can RNF14FTD221R directly replace RNF14FAD221R? A: Yes. Both parts are identical in electrical specifications, tolerance, power rating, and temperature range. The only difference is packaging format (Cut Tape vs. Tape & Box). Selection depends on assembly equipment compatibility and inventory management requirements.

Q: What are the advantages of CMF55 series substitutes over the RNF14FAD221R? A: CMF55 series resistors offer higher power ratings (0.5W vs. 0.25W), lower temperature coefficient (±50ppm/°C vs. ±100ppm/°C), extended operating temperature range (up to 175°C vs. 155°C), and moisture resistant coating. These enhancements provide improved stability and reliability in demanding thermal environments.

Q: Is CMF55221R00DHR6 suitable for RoHS-regulated applications? A: No. CMF55221R00DHR6 is RoHS non-compliant and REACH affected. Use CMF55221R00FHEB or CMF55221R00FHEK for applications requiring ROHS3 compliance.

Q: When should CPF1221R00FKEE6 be selected? A: Select CPF1221R00FKEE6 when circuit design requires 1W power dissipation capability or extended temperature operation to 230°C. This part provides flame proof rating and moisture resistance with ROHS3 compliance.

Q: Are all substitute parts available in the same axial package format? A: Yes. All listed substitute parts use axial through-hole package format compatible with standard PCB assembly processes. Packaging variations (Tape & Box, Cut Tape, Bulk) affect supply chain logistics but not electrical or mechanical compatibility.

Q: What is the impact of tolerance differences between substitute parts? A: RNF14FAD221R and most substitutes maintain ±1% tolerance. CMF55221R00DHR6 offers tighter ±0.5% tolerance for applications requiring higher precision. Tolerance selection depends on circuit design requirements and acceptable resistance value variation.

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