RNF14FTD37R4 Equivalent & Substitute Parts

Part Overview

The RNF14FTD37R4 is a 37.4 Ohms ±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 in compact form factors. The part is currently active in production with 735 units in stock. Substitute parts are identified to address inventory availability, enhanced performance specifications, or specific application requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

RNF14FTD37R4

Stackpole Electronics IncIn Stock: 762RNF14FTD37R4 Datasheet

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CMF5537R400FHEB

Vishay DaleIn Stock: 1207CMF5537R400FHEB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The CMF5537R400FHEB qualifies as a substitute for the RNF14FTD37R4 based on the following critical parameters:

• Resistance Value: Both parts provide 37.4 Ohms ±1% tolerance, ensuring electrical equivalence
• Composition: Both are metal film resistors with identical tolerance specifications
• Package Configuration: Both use axial through-hole packaging with 2 terminations
• Compliance: Both are ROHS3 compliant and REACH unaffected
• Safety Features: Both include flame retardant coating and safety-grade construction

The CMF5537R400FHEB represents an upgrade path with enhanced specifications: higher power rating (0.5W vs 0.25W), improved temperature coefficient (±50ppm/°C vs ±100ppm/°C), extended operating temperature range (-55°C to 175°C vs -55°C to 155°C), and moisture-resistant construction.

Parameter Comparison

Engineering Selection Recommendations

Both the RNF14FTD37R4 and CMF5537R400FHEB are active production components with full ROHS3 compliance and REACH unaffected status. Selection between these parts depends on application thermal and power dissipation requirements:

• RNF14FTD37R4: Select for standard 1/4W applications with operating temperatures not exceeding 155°C and where tape & reel packaging is required
• CMF5537R400FHEB: Select for applications requiring higher power dissipation capability (0.5W), superior temperature stability (±50ppm/°C), extended temperature operation to 175°C, or moisture-resistant construction in humid environments

Both parts maintain identical electrical characteristics (37.4 Ohms ±1%) and are mechanically compatible in axial through-hole PCB layouts. The CMF5537R400FHEB offers enhanced performance margins suitable for demanding industrial and automotive applications.

Frequently Asked Questions (FAQ)

Q: Can CMF5537R400FHEB directly replace RNF14FTD37R4 in existing designs?

A: Yes. Both resistors provide identical resistance values (37.4 Ohms ±1%), tolerance specifications, and axial through-hole package configurations. PCB footprints are compatible. The CMF5537R400FHEB's slightly smaller physical dimensions (0.090" Dia x 0.240" L vs 0.093" Dia x 0.250" L) do not affect mounting compatibility.

Q: What are the key differences between these parts?

A: The primary differences are power rating (0.5W vs 0.25W), temperature coefficient (±50ppm/°C vs ±100ppm/°C), maximum operating temperature (175°C vs 155°C), and moisture resistance. The CMF5537R400FHEB provides enhanced performance specifications across all parameters.

Q: Are both parts suitable for high-temperature applications?

A: The RNF14FTD37R4 operates to 155°C maximum. The CMF5537R400FHEB extends to 175°C, making it suitable for higher-temperature environments. Selection depends on specific application temperature requirements.

Q: What packaging formats are available?

A: RNF14FTD37R4 is supplied in Tape & Reel (TR) format. CMF5537R400FHEB is supplied in Cut Tape (CT) format. Packaging selection depends on assembly process requirements and order quantities.

Q: Do both parts meet automotive and industrial compliance standards?

A: Both parts are ROHS3 compliant and REACH unaffected. Both include flame retardant coating and safety-grade construction suitable for regulated applications. Verify specific application certifications with component datasheets.