RNF14BTC49R9 Equivalent & Substitute Parts

Part Overview

The RNF14BTC49R9 is a 49.9 Ohm ±0.1% metal film axial through-hole resistor rated at 0.25W (1/4W) manufactured by Stackpole Electronics Inc. This component is designed for precision applications requiring tight tolerance and stable performance across industrial temperature ranges. The part is currently active in production with 910 units in stock. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility within specified parameter ranges.

Substiute Parts

RNF14BTC49R9

Stackpole Electronics IncIn Stock: 990RNF14BTC49R9 Datasheet

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CMF5549R900BEEB

Vishay DaleIn Stock: 2122CMF5549R900BEEB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14BTC49R9 are qualified based on the following electrical and mechanical parameters:

Critical Parameters (Must Match):

• Resistance value: 49.9 Ohms
• Tolerance: ±0.1%
• Composition: Metal Film
• Package type: Axial through-hole
• RoHS compliance: ROHS3 Compliant

Allowable Variations:

• Power rating: Equal to or greater than 0.25W
• Temperature coefficient: Equal to or lower absolute value
• Operating temperature range: Equal to or exceeding the original range
• Physical dimensions: Minor variations acceptable within axial package standards
• Packaging format: Tape & Reel or Cut Tape acceptable

The CMF5549R900BEEB qualifies as a substitute based on these criteria, offering enhanced specifications in power rating (0.5W vs 0.25W) and improved temperature coefficient (±25ppm/°C vs ±50ppm/°C).

Parameter Comparison

Engineering Selection Recommendations

Both the RNF14BTC49R9 and CMF5549R900BEEB are active production components with ROHS3 compliance and REACH unaffected status. The CMF5549R900BEEB provides upgraded performance characteristics including doubled power dissipation capacity (0.5W vs 0.25W) and superior temperature stability (±25ppm/°C vs ±50ppm/°C). The extended operating temperature range to 175°C offers additional margin for high-temperature applications. Both components maintain identical resistance and tolerance specifications, ensuring electrical equivalence in circuit applications. Physical dimensions are comparable within standard axial package tolerances.

Frequently Asked Questions (FAQ)

Q: Can CMF5549R900BEEB be used as a direct replacement for RNF14BTC49R9?

A: Yes. Both components share identical resistance (49.9 Ohms) and tolerance (±0.1%) specifications. The CMF5549R900BEEB offers enhanced power rating and temperature coefficient performance, making it suitable for direct substitution in applications where the original part is specified.

Q: What are the physical dimension differences between these parts?

A: The CMF5549R900BEEB is slightly smaller (0.090" Dia x 0.240" L) compared to the RNF14BTC49R9 (0.093" Dia x 0.250" L). Both are standard axial package configurations with two terminations, and the dimensional variation falls within acceptable tolerances for through-hole PCB mounting.

Q: Are there any compliance or certification differences?

A: Both parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. No compliance or certification differences exist between the two components.

Q: Why does the substitute have a higher power rating?

A: The CMF5549R900BEEB is rated at 0.5W (1/2W) versus the original 0.25W (1/4W). This represents an upgrade in thermal dissipation capability and does not affect electrical compatibility. The higher power rating provides additional design margin for thermal management in the application circuit.

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

A: The RNF14BTC49R9 has a temperature coefficient of ±50ppm/°C, while the CMF5549R900BEEB has ±25ppm/°C. The lower absolute value in the substitute indicates superior frequency stability and reduced resistance drift across temperature variations, beneficial for precision measurement and signal conditioning circuits.