RNF14FTC634R Equivalent & Substitute Parts

Part Overview

The RNF14FTC634R is a 634 Ohm ±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 applications requiring precision resistance values with reliable performance across industrial temperature ranges. The part maintains Active product status with ROHS3 compliance and is currently in stock inventory. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility can be maintained while potentially offering enhanced performance characteristics or improved availability.

Substiute Parts

RNF14FTC634R

Stackpole Electronics IncIn Stock: 959RNF14FTC634R Datasheet

Current PartRFQ

CMF55634R00FHEB

Vishay DaleIn Stock: 1794CMF55634R00FHEB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF14FTC634R is determined by the following critical parameters:

Electrical Equivalence Requirements:

• Resistance value: 634 Ohms (exact match required)
• Tolerance: ±1% (maintains precision specifications)
• Temperature coefficient: ±50ppm/°C (ensures thermal stability)
• Composition: Metal Film (preserves electrical characteristics)

Mechanical Compatibility Requirements:

• Package type: Axial (physical form factor)
• Number of terminations: 2 (connection compatibility)
• Compliance certifications: ROHS3 Compliant, REACH Unaffected (regulatory alignment)

Performance Enhancement Allowances:

• Power rating may be equal or higher (0.25W or greater)
• Operating temperature range may be equal or extended
• Additional protective features (moisture resistance) are permissible

The CMF55634R00FHEB qualifies as a substitute based on matching all electrical equivalence requirements and mechanical compatibility criteria, while offering enhanced power rating (0.5W) and extended operating temperature range (-55°C ~ 175°C).

Parameter Comparison

Engineering Selection Recommendations

RNF14FTC634R Selection Criteria:

• Applications with strict space constraints requiring the original dimensional specifications
• Designs optimized for 0.25W power dissipation requirements
• Operating environments limited to -55°C ~ 155°C temperature range
• Preference for Stackpole Electronics Inc sourcing and supply chain

CMF55634R00FHEB Selection Criteria:

• Applications benefiting from higher power rating (0.5W) for thermal margin
• Designs requiring extended operating temperature capability (-55°C ~ 175°C)
• Environments where moisture resistance provides additional reliability
• Vishay Dale component availability and supply chain preference
• Compact form factor advantage (slightly smaller dimensions)

Both parts maintain identical electrical specifications (634 Ohms ±1%, ±50ppm/°C temperature coefficient) and regulatory compliance (ROHS3, REACH Unaffected). Selection between these components is based on application-specific thermal requirements, environmental conditions, and supply chain considerations rather than electrical performance differences.

Frequently Asked Questions (FAQ)

Q: Can CMF55634R00FHEB directly replace RNF14FTC634R in existing designs?

A: Yes, for applications where the 0.25W power rating is not a limiting constraint. The substitute part provides identical resistance, tolerance, and temperature coefficient specifications. Verify that the slightly smaller physical dimensions (0.090" Dia x 0.240" L versus 0.093" Dia x 0.250" L) do not create mechanical interference in your PCB layout or component mounting.

Q: What is the significance of the higher power rating in CMF55634R00FHEB?

A: The 0.5W rating provides additional thermal headroom compared to the 0.25W specification of the main part. This allows the substitute to dissipate more power without exceeding temperature limits, beneficial in high-current or high-ambient-temperature applications.

Q: Are there any compatibility concerns with the axial package format?

A: Both parts use identical axial through-hole package types with 2 terminations. Physical dimensions differ slightly, but both are compatible with standard axial component mounting and PCB hole spacing. Verify lead spacing compatibility with your specific PCB design.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both RNF14FTC634R and CMF55634R00FHEB are ROHS3 Compliant and REACH Unaffected, ensuring equivalent regulatory compliance for applications requiring these certifications.

Q: What is the practical difference between -55°C ~ 155°C and -55°C ~ 175°C operating ranges?

A: The extended range of CMF55634R00FHEB provides 20°C additional high-temperature capability. This is relevant for applications in high-temperature environments or where thermal margin is critical for long-term reliability.

Q: Is moisture resistance a critical factor for substitution?

A: Moisture resistance is an additional feature of CMF55634R00FHEB that does not affect substitution eligibility. It provides enhanced protection in humid or corrosive environments but is not required for basic electrical equivalence.