PRNF14FTD549K Equivalent & Substitute Parts

Part Overview

The PRNF14FTD549K is a 549 kOhms ±1% 0.25W (1/4W) through-hole resistor manufactured by Stackpole Electronics Inc in the RNF series. This metal film axial resistor features flame retardant coating and safety characteristics, with an operating temperature range of -55°C to 155°C. The part is actively produced and ROHS3 compliant. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained within the allowed parameter tolerances for this resistor category.

Substiute Parts

PRNF14FTD549K

Stackpole Electronics IncIn Stock: 804PRNF14FTD549K Datasheet

Current PartRFQ

RNF14FTD549K

Stackpole Electronics IncIn Stock: 9208RNF14FTD549K Datasheet

DirectRFQ

CMF55549K00FHEB

Vishay DaleIn Stock: 1180CMF55549K00FHEB Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PRNF14FTD549K are classified based on the following substitution criteria:

Direct Equivalent (Same Packaging Format): RNF14FTD549K maintains identical electrical specifications and mechanical dimensions. The only difference is packaging format (Cut Tape vs. Tape & Reel), which does not affect component functionality or circuit performance.

Upgrade Substitute (Enhanced Specifications): CMF55549K00FHEB from Vishay Dale provides the same 549 kOhms ±1% resistance value with improved performance characteristics. This substitute offers higher power rating (0.5W vs. 0.25W), lower temperature coefficient (±50ppm/°C vs. ±100ppm/°C), extended operating temperature range (-55°C ~ 175°C vs. -55°C ~ 155°C), and additional moisture resistance feature. The axial package type and metal film composition remain compatible.

Parameter Comparison

Engineering Selection Recommendations

RNF14FTD549K is the direct equivalent substitute when packaging format change from Tape & Reel to Cut Tape is acceptable. Both parts are manufactured by Stackpole Electronics Inc with identical electrical and mechanical specifications. Selection is appropriate for applications where component sourcing flexibility is required without circuit redesign.

CMF55549K00FHEB is the upgrade substitute for applications requiring enhanced performance margins. The higher power rating (0.5W) provides additional thermal headroom in circuits operating near the 0.25W limit. The lower temperature coefficient (±50ppm/°C) improves frequency stability and precision in temperature-sensitive applications. The extended operating temperature range (-55°C ~ 175°C) accommodates high-temperature environments beyond the original specification. All three parts maintain ROHS3 compliance and active production status, ensuring long-term availability and regulatory consistency.

Frequently Asked Questions (FAQ)

Q: Can RNF14FTD549K replace PRNF14FTD549K in production? A: Yes. Both parts have identical electrical specifications (549 kOhms ±1%, 0.25W, ±100ppm/°C) and mechanical dimensions (0.093" Dia x 0.250" L). The difference is packaging format only (Cut Tape vs. Tape & Reel), which does not affect circuit performance or component functionality.

Q: Is CMF55549K00FHEB a direct replacement or an upgrade? A: CMF55549K00FHEB is an upgrade substitute. It maintains the same 549 kOhms ±1% resistance value and axial package type, but offers improved specifications: higher power rating (0.5W vs. 0.25W), lower temperature coefficient (±50ppm/°C vs. ±100ppm/°C), extended temperature range (-55°C ~ 175°C vs. -55°C ~ 155°C), and moisture resistance. Circuit redesign is not required for substitution.

Q: Are all substitute parts ROHS3 compliant? A: Yes. PRNF14FTD549K, RNF14FTD549K, and CMF55549K00FHEB are all ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.

Q: What is the physical size difference between PRNF14FTD549K and CMF55549K00FHEB? A: PRNF14FTD549K measures 0.093" Dia x 0.250" L (2.35mm x 6.35mm). CMF55549K00FHEB measures 0.090" Dia x 0.240" L (2.29mm x 6.10mm). Both are axial package resistors with compatible PCB footprints for through-hole mounting.

Q: Can CMF55549K00FHEB be used in applications with temperature extremes? A: Yes. CMF55549K00FHEB operates from -55°C to 175°C, extending 20°C beyond the PRNF14FTD549K specification (-55°C ~ 155°C). This makes it suitable for high-temperature industrial and automotive applications where the original part may reach thermal limits.