RNF14FAD49K9 Equivalent & Substitute Parts

Part Overview

The RNF14FAD49K9 is a 49.9 kOhms ±1% metal film through-hole resistor rated at 0.25W (1/4W) in axial package configuration, manufactured by Stackpole Electronics Inc. This component is actively produced and widely used in general-purpose electronic applications requiring precision resistance values with flame retardant coating and safety features. Substitute parts are identified to address packaging availability, enhanced performance specifications, or inventory requirements while maintaining electrical compatibility within defined parameter tolerances.

Substiute Parts

RNF14FAD49K9

Stackpole Electronics IncIn Stock: 884RNF14FAD49K9 Datasheet

Current PartRFQ

RNF14FTD49K9

Stackpole Electronics IncIn Stock: 47308RNF14FTD49K9 Datasheet

DirectRFQ

CMF5549K900BEEB

Vishay DaleIn Stock: 1488CMF5549K900BEEB Datasheet

UpgradeRFQ

CMF5549K900FHEB

Vishay DaleIn Stock: 5001CMF5549K900FHEB Datasheet

UpgradeRFQ

CMF5549K900FHEK

Vishay DaleIn Stock: 907CMF5549K900FHEK Datasheet

UpgradeRFQ

CMF5549K900FKEB

Vishay DaleIn Stock: 3296CMF5549K900FKEB Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14FAD49K9 are categorized based on the following substitution criteria:

Direct Equivalent (Same Electrical Specifications):

• RNF14FTD49K9: Identical electrical parameters (49.9 kOhms ±1%, 0.25W, ±100ppm/°C, -55°C ~ 155°C). Differs only in packaging format (Cut Tape vs. Tape & Box).

Upgraded Alternatives (Enhanced Performance):

• CMF5549K900BEEB: Improved tolerance (±0.1% vs. ±1%), higher power rating (0.5W vs. 0.25W), superior temperature coefficient (±25ppm/°C vs. ±100ppm/°C), extended operating range (-55°C ~ 175°C vs. -55°C ~ 155°C). Manufactured by Vishay Dale.
• CMF5549K900FHEB, CMF5549K900FHEK, CMF5549K900FKEB: Maintained tolerance (±1%), higher power rating (0.5W vs. 0.25W), improved temperature coefficient (±50ppm/°C or ±100ppm/°C), extended operating range (-55°C ~ 175°C). Manufactured by Vishay Dale. Differ in packaging (Cut Tape or Bulk).

All substitutes maintain 49.9 kOhms resistance value, metal film composition, axial package configuration, and ROHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): RNF14FTD49K9 provides identical electrical performance to RNF14FAD49K9 with the same tolerance, power rating, and temperature characteristics. Selection between these parts depends on packaging requirements: Tape & Box for RNF14FAD49K9 or Cut Tape for RNF14FTD49K9. Both are Active products with ROHS3 compliance.

For Enhanced Performance Applications: Vishay Dale CMF series parts (CMF5549K900BEEB, CMF5549K900FHEB, CMF5549K900FHEK, CMF5549K900FKEB) offer higher power dissipation (0.5W vs. 0.25W) and extended operating temperature range (-55°C ~ 175°C vs. -55°C ~ 155°C). CMF5549K900BEEB provides the tightest tolerance specification (±0.1%) and lowest temperature coefficient (±25ppm/°C) for precision applications. All Vishay Dale alternatives are Active products with ROHS3 compliance.

Packaging Considerations:

• Cut Tape packaging (RNF14FTD49K9, CMF5549K900BEEB, CMF5549K900FHEB, CMF5549K900FKEB) suits automated assembly processes.
• Bulk packaging (CMF5549K900FHEK) accommodates manual assembly or reel consolidation.
• Tape & Box packaging (RNF14FAD49K9) provides standard distribution format.

Frequently Asked Questions (FAQ)

Q: Can RNF14FTD49K9 directly replace RNF14FAD49K9 in my circuit? A: Yes. RNF14FTD49K9 is electrically identical to RNF14FAD49K9, with matching resistance (49.9 kOhms), tolerance (±1%), power rating (0.25W), temperature coefficient (±100ppm/°C), and operating range (-55°C ~ 155°C). The only difference is packaging format (Cut Tape vs. Tape & Box).

Q: What are the advantages of CMF5549K900BEEB over the original RNF14FAD49K9? A: CMF5549K900BEEB offers three performance enhancements: higher power rating (0.5W vs. 0.25W), tighter tolerance (±0.1% vs. ±1%), and superior temperature stability (±25ppm/°C vs. ±100ppm/°C). Operating temperature range extends to 175°C compared to 155°C. These upgrades benefit precision circuits and high-temperature environments.

Q: Are all substitute parts ROHS3 compliant? A: Yes. RNF14FAD49K9, RNF14FTD49K9, and all CMF series substitutes (CMF5549K900BEEB, CMF5549K900FHEB, CMF5549K900FHEK, CMF5549K900FKEB) are ROHS3 compliant.

Q: Which substitute part has the highest inventory availability? A: RNF14FTD49K9 has the highest inventory at 47,283 pieces. This direct equivalent offers both electrical compatibility and superior stock levels compared to the original RNF14FAD49K9 (864 pieces).

Q: Can I use a 0.5W rated resistor in place of a 0.25W rated resistor? A: Yes, from a power dissipation perspective. A higher power rating provides greater thermal margin. However, physical dimensions differ slightly between RNF14FAD49K9 (0.093" Dia x 0.250" L) and CMF series (0.090" Dia x 0.240" L). Verify PCB layout compatibility before substitution.

Q: What is the difference between CMF5549K900FHEB and CMF5549K900FKEB? A: Both parts share identical electrical specifications (49.9 kOhms ±1%, 0.5W, -55°C ~ 175°C). The difference is temperature coefficient: CMF5549K900FHEB has ±50ppm/°C while CMF5549K900FKEB has ±100ppm/°C. CMF5549K900FHEB provides superior temperature stability for precision applications.