RNF14BTE49R9 Equivalent & Substitute Parts

Part Overview

The RNF14BTE49R9 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 features flame retardant coating and safety-grade construction with an operating temperature range of -55°C to 155°C. The part is currently active in production 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

RNF14BTE49R9

Stackpole Electronics IncIn Stock: 763RNF14BTE49R9 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 RNF14BTE49R9 are qualified based on the following electrical and mechanical parameters:

• Resistance value: 49.9 Ohms (exact match required)
• Tolerance: ±0.1% (exact match required)
• Composition: Metal Film (exact match required)
• Package: Axial through-hole (exact match required)
• Temperature Coefficient: ±25ppm/°C (exact match required)
• Compliance: ROHS3 Compliant (minimum requirement)

The CMF5549R900BEEB qualifies as a substitute because it maintains all critical electrical parameters while offering an upgraded power rating (0.5W vs. 0.25W) and extended operating temperature range (-55°C to 175°C vs. -55°C to 155°C). The higher power rating and extended temperature range provide additional design margin without compromising the core electrical specifications required for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

Both the RNF14BTE49R9 and CMF5549R900BEEB are active production components with ROHS3 compliance and REACH unaffected status. Selection between these parts depends on application requirements:

The RNF14BTE49R9 is appropriate for applications where the 0.25W power rating is sufficient and the operating temperature range of -55°C to 155°C meets design specifications.

The CMF5549R900BEEB is suitable for applications requiring higher power dissipation capability (0.5W), extended operating temperature range to 175°C, or moisture-resistant construction. The upgraded specifications provide additional design margin in thermally demanding or high-humidity environments.

Both parts maintain identical electrical performance at the specified 49.9 Ohm resistance and ±0.1% tolerance, ensuring functional equivalence in circuits designed for either component.

Frequently Asked Questions (FAQ)

Q: Can CMF5549R900BEEB directly replace RNF14BTE49R9 in existing designs?

A: Yes. Both parts share identical resistance (49.9 Ohms), tolerance (±0.1%), temperature coefficient (±25ppm/°C), and axial package configuration. The CMF5549R900BEEB's higher power rating and extended temperature range do not create compatibility issues in circuits designed for the RNF14BTE49R9.

Q: What is the difference in physical dimensions between these parts?

A: RNF14BTE49R9 dimensions are 0.093" Dia x 0.250" L (2.35mm x 6.35mm). CMF5549R900BEEB dimensions are 0.090" Dia x 0.240" L (2.29mm x 6.10mm). Both are axial through-hole components with minor dimensional variation that does not affect PCB layout compatibility.

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

A: The CMF5549R900BEEB is rated at 0.5W (1/2W) compared to the RNF14BTE49R9 at 0.25W (1/4W). This upgrade reflects the substitute's enhanced thermal design and does not alter electrical performance at the specified resistance value. Higher power rating provides additional margin for thermal stress in demanding applications.

Q: Are there packaging differences between these parts?

A: The RNF14BTE49R9 is supplied in Tape & Reel (TR) format, while the CMF5549R900BEEB is supplied in Cut Tape (CT) format. Both packaging formats are standard for through-hole axial resistors and do not affect component performance or PCB assembly compatibility.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the RNF14BTE49R9 and CMF5549R900BEEB are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8533.21.0090.