RNF14BTC49K9 Equivalent & Substitute Parts

Part Overview

The RNF14BTC49K9 is a 49.9 kOhms ±0.1% 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-grade construction, designed for precision applications requiring tight tolerance specifications. The part is currently active in production with 698 units in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across alternative manufacturers.

Substiute Parts

RNF14BTC49K9

Stackpole Electronics IncIn Stock: 773RNF14BTC49K9 Datasheet

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CMF5549K900BEEB

Vishay DaleIn Stock: 1488CMF5549K900BEEB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14BTC49K9 are qualified based on the following criteria:

• Identical resistance value: 49.9 kOhms
• Identical tolerance: ±0.1%
• Identical composition: Metal Film
• Identical package type: Axial through-hole
• Identical termination count: 2
• Compliance with ROHS3 and REACH requirements
• Axial package mechanical compatibility

The CMF5549K900BEEB qualifies as a substitute despite higher power rating (0.5W vs 0.25W) and improved temperature coefficient (±25ppm/°C vs ±50ppm/°C), as these represent performance enhancements within the same electrical class. The extended operating temperature range (-55°C ~ 175°C vs -55°C ~ 155°C) provides additional operational margin.

Parameter Comparison

Engineering Selection Recommendations

Both the RNF14BTC49K9 and CMF5549K900BEEB meet ROHS3 compliance and REACH requirements, qualifying them for equivalent use in regulated applications. The CMF5549K900BEEB provides enhanced performance characteristics including superior temperature coefficient stability and extended operating temperature range, making it suitable for applications requiring tighter thermal performance margins. Selection between these parts should be based on circuit power dissipation requirements and thermal environment specifications. The CMF5549K900BEEB's higher power rating (0.5W) accommodates applications where the RNF14BTC49K9's 0.25W rating may approach thermal limits. Both parts maintain identical electrical specifications for resistance and tolerance, ensuring functional equivalence in precision measurement and signal conditioning circuits.

Frequently Asked Questions (FAQ)

Q: Can the CMF5549K900BEEB directly replace the RNF14BTC49K9 in existing designs?

A: Yes. Both parts share identical resistance (49.9 kOhms), tolerance (±0.1%), composition (metal film), and axial package configuration. The CMF5549K900BEEB's higher power rating and improved temperature coefficient represent performance enhancements that do not compromise compatibility.

Q: What is the significance of the different power ratings (0.25W vs 0.5W)?

A: Power rating indicates maximum continuous power dissipation. The CMF5549K900BEEB's 0.5W rating provides greater thermal headroom in circuits where the RNF14BTC49K9's 0.25W rating may be marginal. Selection depends on actual circuit power dissipation at the resistor.

Q: Are there packaging differences between these parts?

A: Yes. The RNF14BTC49K9 is supplied in Tape & Reel (TR) format, while the CMF5549K900BEEB is supplied in Cut Tape (CT) format. Both are axial through-hole components with identical mechanical dimensions for PCB mounting.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the RNF14BTC49K9 and CMF5549K900BEEB are ROHS3 compliant and REACH unaffected, meeting equivalent regulatory requirements for industrial and commercial applications.

Q: What is the difference in temperature coefficient between these parts?

A: The RNF14BTC49K9 has a temperature coefficient of ±50ppm/°C, while the CMF5549K900BEEB has ±25ppm/°C. Lower temperature coefficient indicates better resistance stability across temperature variations, providing improved accuracy in precision circuits.