PRNF14FTD49K9 Equivalent & Substitute Parts

Part Overview

The PRNF14FTD49K9 is a 49.9 kOhms ±1% metal film through-hole resistor rated at 0.25W (1/4W) in axial configuration, manufactured by Stackpole Electronics Inc under the RNF series. This component is Active status and ROHS3 compliant. Substitute parts are identified to address packaging availability, enhanced performance specifications, or inventory requirements while maintaining electrical compatibility within the 49.9 kOhms resistance value and axial package class.

Key Parameters

Parameter	Value
Resistance	49.9 kOhms
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 are grouped into two categories based on allowed electrical and mechanical parameters:

Direct Equivalent (Same Specifications)

RNF14FTD49K9 (Stackpole Electronics Inc, Cut Tape packaging): Identical electrical specifications and axial package configuration. Differs only in packaging format (Cut Tape vs. Tape & Reel).

Upgrade Substitutes (Enhanced Performance)

CMF5549K900BEEB, CMF5549K900FHEB, CMF5549K900FHEK, CMF5549K900FKEB (Vishay Dale, CMF series): These parts maintain the 49.9 kOhms resistance value and axial package class. Upgrades include increased power rating (0.5W vs. 0.25W), improved tolerance (±0.1% for BEEB variant), lower temperature coefficient (±25ppm/°C to ±50ppm/°C), extended operating temperature range (-55°C ~ 175°C), and moisture-resistant features. Packaging varies between Cut Tape and Bulk formats.

Substitution is valid when the replacement part meets or exceeds the original specifications for resistance, tolerance, power rating, and operating temperature range within the axial through-hole resistor category.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power Rating	Temp Coeff	Operating Temp	Packaging	Features
PRNF14FTD49K9	Stackpole Electronics Inc	49.9 kOhms	±1%	0.25W	±100ppm/°C	-55°C ~ 155°C	Tape & Reel	Flame Retardant, Safety
RNF14FTD49K9	Stackpole Electronics Inc	49.9 kOhms	±1%	0.25W	±100ppm/°C	-55°C ~ 155°C	Cut Tape	Flame Retardant, Safety
CMF5549K900BEEB	Vishay Dale	49.9 kOhms	±0.1%	0.5W	±25ppm/°C	-55°C ~ 175°C	Cut Tape	Flame Retardant, Moisture Resistant, Safety
CMF5549K900FHEB	Vishay Dale	49.9 kOhms	±1%	0.5W	±50ppm/°C	-55°C ~ 175°C	Cut Tape	Flame Retardant, Moisture Resistant, Safety
CMF5549K900FHEK	Vishay Dale	49.9 kOhms	±1%	0.5W	±50ppm/°C	-55°C ~ 175°C	Bulk	Flame Retardant, Moisture Resistant, Safety
CMF5549K900FKEB	Vishay Dale	49.9 kOhms	±1%	0.5W	±100ppm/°C	-55°C ~ 175°C	Cut Tape	Flame Retardant, Moisture Resistant, Safety

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the original PRNF14FTD49K9.

RNF14FTD49K9 (Stackpole Electronics Inc, Cut Tape) is the direct functional equivalent and should be selected when packaging format change from Tape & Reel to Cut Tape is acceptable and inventory availability is the primary consideration.

CMF series parts (Vishay Dale) provide upgrade performance with higher power ratings (0.5W vs. 0.25W), lower temperature coefficients, extended operating temperature range to 175°C, and moisture-resistant properties. These are suitable for applications requiring enhanced thermal margin, tighter tolerance control (CMF5549K900BEEB at ±0.1%), or operation in moisture-prone environments. Packaging options include Cut Tape and Bulk formats.

Selection between CMF variants depends on tolerance requirements (±0.1% for BEEB, ±1% for others) and temperature coefficient specifications (±25ppm/°C for BEEB, ±50ppm/°C for FHEB/FHEK, ±100ppm/°C for FKEB).

Frequently Asked Questions (FAQ)

Q: Can CMF5549K900BEEB replace PRNF14FTD49K9 in all applications? A: CMF5549K900BEEB is electrically compatible as a substitute. It provides enhanced specifications including higher power rating (0.5W vs. 0.25W), tighter tolerance (±0.1% vs. ±1%), and lower temperature coefficient (±25ppm/°C vs. ±100ppm/°C). Physical dimensions differ slightly (0.090" Dia x 0.240" L vs. 0.093" Dia x 0.250" L), which may affect board layout in space-constrained designs.

Q: What is the difference between CMF5549K900FHEB and CMF5549K900FKEB? A: Both parts share identical resistance (49.9 kOhms), tolerance (±1%), power rating (0.5W), and operating temperature range (-55°C ~ 175°C). The difference is temperature coefficient: CMF5549K900FHEB has ±50ppm/°C while CMF5549K900FKEB has ±100ppm/°C. Select FHEB for applications requiring tighter temperature stability.

Q: Are packaging differences between Tape & Reel, Cut Tape, and Bulk significant for substitution? A: Packaging format affects handling, storage, and assembly processes but does not impact electrical performance. Tape & Reel and Cut Tape are suitable for automated assembly. Bulk packaging is appropriate for manual assembly or reel consolidation. Verify compatibility with your assembly equipment before substitution.

Q: Does the moisture-resistant feature of CMF series parts affect compatibility? A: Moisture-resistant properties are additive features that enhance reliability in humid or moisture-prone environments. They do not create incompatibility with the original PRNF14FTD49K9 specification and are beneficial for long-term performance.

Q: Can RNF14FTD49K9 be used as a direct drop-in replacement? A: Yes. RNF14FTD49K9 is electrically and mechanically identical to PRNF14FTD49K9, differing only in packaging format (Cut Tape vs. Tape & Reel). It is a direct equivalent suitable for immediate substitution.

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