RNF14BTC249K Equivalent & Substitute Parts

Part Overview

The RNF14BTC249K is a 249 kOhm ±0.1% metal film axial resistor rated at 0.25W (1/4W) manufactured by Stackpole Electronics Inc. This component is designed for precision applications requiring tight tolerance specifications and flame retardant construction. The part is currently in active production status with 999 units available in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained while potentially offering enhanced operational characteristics or improved availability.

Substiute Parts

RNF14BTC249K

Stackpole Electronics IncIn Stock: 1039RNF14BTC249K Datasheet

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CMF55249K00BEEB

Vishay DaleIn Stock: 4614CMF55249K00BEEB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF14BTC249K is determined by the following critical parameters:

• Resistance Value: Must be 249 kOhms
• Tolerance: Must be ±0.1% or tighter
• Composition: Must be metal film
• Package Type: Must be axial through-hole
• Regulatory Compliance: Must maintain ROHS3 compliance and REACH unaffected status

The CMF55249K00BEEB from Vishay Dale meets all substitution criteria. While this part features a higher power rating (0.5W vs 0.25W) and improved temperature coefficient (±25ppm/°C vs ±50ppm/°C), these represent enhancements rather than deviations from the core electrical specification. The axial package geometry remains compatible with existing PCB layouts designed for the RNF14BTC249K.

Parameter Comparison

Engineering Selection Recommendations

Both the RNF14BTC249K and CMF55249K00BEEB maintain full ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for industrial and commercial applications. The RNF14BTC249K remains the primary specification when the 0.25W power rating is sufficient for the circuit design and the ±50ppm/°C temperature coefficient meets stability requirements.

The CMF55249K00BEEB serves as a direct substitute when higher power dissipation capability is beneficial or when the improved temperature coefficient (±25ppm/°C) enhances circuit performance. The slightly reduced physical dimensions of the CMF55249K00BEEB provide marginal space advantages in compact layouts. Both parts are axial through-hole components with identical termination configuration and compatible with standard PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the CMF55249K00BEEB replace the RNF14BTC249K in existing designs?

A: Yes. Both parts share identical resistance value (249 kOhms), tolerance (±0.1%), composition (metal film), and axial package configuration. The CMF55249K00BEEB features enhanced specifications including higher power rating and improved temperature coefficient, making it functionally compatible with designs specified for the RNF14BTC249K.

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

A: The RNF14BTC249K measures 0.093" diameter by 0.250" length (2.35mm x 6.35mm). The CMF55249K00BEEB measures 0.090" diameter by 0.240" length (2.29mm x 6.10mm). Both dimensions are within typical axial resistor tolerances and compatible with standard PCB hole spacing.

Q: Are both parts compliant with environmental regulations?

A: Yes. Both the RNF14BTC249K and CMF55249K00BEEB are ROHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance restrictions for electronic components.

Q: What is the significance of the temperature coefficient difference?

A: The RNF14BTC249K has a temperature coefficient of ±50ppm/°C while the CMF55249K00BEEB has ±25ppm/°C. This means the CMF55249K00BEEB exhibits half the resistance change per degree Celsius, providing superior stability across the operating temperature range. Applications requiring minimal resistance drift with temperature benefit from the lower coefficient.

Q: Can the RNF14BTC249K be used where the CMF55249K00BEEB is specified?

A: The RNF14BTC249K can be used as a substitute only when the circuit design accommodates the lower power rating (0.25W vs 0.5W) and the higher temperature coefficient (±50ppm/°C vs ±25ppm/°C) does not compromise performance requirements.