RNF14FAC49K9 Equivalent & Substitute Parts

Part Overview

The RNF14FAC49K9 is a 49.9 kOhms ±1% metal film axial through-hole resistor rated at 0.25W (1/4W) manufactured by Stackpole Electronics Inc. This component features flame retardant coating and safety construction, operating across -55°C to 155°C. The part is Active status and ROHS3 compliant. Substitute parts are identified when equivalent resistance values, tolerance grades, and power ratings meet or exceed the original specification while maintaining mechanical and electrical compatibility.

Substiute Parts

RNF14FAC49K9

Stackpole Electronics IncIn Stock: 918RNF14FAC49K9 Datasheet

Current PartRFQ

CMF5549K900BEEB

Vishay DaleIn Stock: 1488CMF5549K900BEEB Datasheet

UpgradeRFQ

CMF5549K900FHEB

Vishay DaleIn Stock: 5001CMF5549K900FHEB Datasheet

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CMF5549K900FHEK

Vishay DaleIn Stock: 907CMF5549K900FHEK Datasheet

UpgradeRFQ

CMF5049K900FHEB

Vishay DaleIn Stock: 1591CMF5049K900FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Mandatory Matching Parameters:

• Resistance value: 49.9 kOhms (exact match required)
• Package type: Axial (mechanical compatibility)
• Composition: Metal Film (electrical characteristics)
• RoHS compliance: ROHS3 Compliant

Allowable Upgrade Parameters:

• Tolerance: ±1% or better (±0.1% acceptable)
• Power rating: Equal or greater than 0.25W
• Temperature coefficient: Equal or lower absolute value
• Operating temperature range: Equal or wider range
• Features: Equal or enhanced (moisture resistance acceptable addition)

Substitute parts are grouped by power rating upgrade level. Parts with 0.5W (1/2W) rating represent performance upgrades. Parts maintaining 0.25W (1/4W) rating represent direct equivalents with enhanced specifications.

Parameter Comparison

Engineering Selection Recommendations

CMF5049K900FHEB (Direct Equivalent) This part maintains the 0.25W power rating of the original RNF14FAC49K9 while providing identical tolerance (±1%), resistance value (49.9 kOhms), and temperature coefficient (±50ppm/°C). Operating temperature range extends to 175°C. All parts are ROHS3 compliant and Active status. Packaging is Cut Tape (CT). Physical dimensions are smaller (0.065" Dia x 0.150" L vs. 0.093" Dia x 0.250" L), which may affect PCB layout compatibility.

CMF5549K900FHEB and CMF5549K900FHEK (Performance Upgrade) Both parts upgrade power rating to 0.5W while maintaining ±1% tolerance and 49.9 kOhms resistance. Operating temperature extends to 175°C. CMF5549K900FHEB is packaged in Cut Tape (CT); CMF5549K900FHEK is packaged in Bulk. Physical dimensions are slightly smaller (0.090" Dia x 0.240" L). All parts are ROHS3 compliant and Active status.

CMF5549K900BEEB (Enhanced Tolerance Upgrade) This part provides the highest tolerance grade (±0.1%) with 0.5W power rating and 49.9 kOhms resistance. Temperature coefficient improves to ±25ppm/°C. Operating temperature extends to 175°C. Packaged in Cut Tape (CT). ROHS3 compliant and Active status.

Frequently Asked Questions (FAQ)

Q: Can CMF5049K900FHEB replace RNF14FAC49K9 in all applications? A: CMF5049K900FHEB is electrically equivalent with identical power rating (0.25W), tolerance (±1%), and resistance (49.9 kOhms). Physical dimensions differ; verify PCB layout compatibility before substitution.

Q: What is the advantage of upgrading to CMF5549K900FHEB or CMF5549K900FHEK? A: Both parts double the power rating from 0.25W to 0.5W, extending thermal margin in the circuit. Operating temperature range increases to 175°C. Mechanical dimensions are slightly smaller. Electrical specifications (resistance, tolerance, temperature coefficient) remain compatible.

Q: Why does CMF5549K900BEEB have a different tolerance specification? A: CMF5549K900BEEB provides ±0.1% tolerance versus the original ±1%, offering tighter resistance accuracy. Temperature coefficient also improves to ±25ppm/°C. This part is suitable for precision applications requiring enhanced stability.

Q: Are all substitute parts ROHS3 compliant? A: All listed substitute parts (CMF5549K900BEEB, CMF5549K900FHEB, CMF5549K900FHEK, CMF5049K900FHEB) are ROHS3 compliant and Active status, matching the original RNF14FAC49K9 compliance profile.

Q: What is the difference between Cut Tape (CT) and Bulk packaging? A: Cut Tape (CT) packaging provides components on continuous tape suitable for automated pick-and-place assembly. Bulk packaging contains loose components. Selection depends on assembly process requirements. CMF5549K900FHEK is available in Bulk; CMF5549K900FHEB is available in Cut Tape (CT).

Q: Can I use CMF5549K900FHEB in place of RNF14FAC49K9 if space is not a constraint? A: Yes. CMF5549K900FHEB meets all mandatory parameters (49.9 kOhms resistance, axial package, metal film composition, ROHS3 compliance) and provides performance upgrades (0.5W power rating, extended temperature range to 175°C, moisture resistance). Electrical compatibility is confirmed.