RNF14FAD37R4 Equivalent & Substitute Parts

Part Overview

The RNF14FAD37R4 is a 37.4 Ohms ±1% 0.25W (1/4W) through-hole resistor manufactured by Stackpole Electronics Inc. This axial metal film resistor features flame retardant coating and safety design, suitable for general-purpose electronic applications requiring precision resistance values. The part is currently in active production status with 1051 pieces available in inventory. Substitute parts may be required due to supply constraints, design upgrades, or application-specific performance requirements such as increased power dissipation or improved temperature stability.

Substiute Parts

RNF14FAD37R4

Stackpole Electronics IncIn Stock: 1159RNF14FAD37R4 Datasheet

Current PartRFQ

CMF5537R400FHEB

Vishay DaleIn Stock: 1207CMF5537R400FHEB Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

The CMF5537R400FHEB from Vishay Dale qualifies as a direct substitute based on the following critical parameters:

• Resistance value: 37.4 Ohms (identical)
• Tolerance: ±1% (identical)
• Composition: Metal Film (identical)
• Package: Axial (identical)
• Compliance: ROHS3 Compliant (identical)

The substitute part provides enhanced specifications in power rating (0.5W vs. 0.25W), temperature coefficient (±50ppm/°C vs. ±100ppm/°C), and maximum operating temperature (175°C vs. 155°C). These upgrades maintain backward compatibility while offering improved performance margins for thermal and power dissipation scenarios.

Parameter Comparison

Engineering Selection Recommendations

Both the RNF14FAD37R4 and CMF5537R400FHEB meet ROHS3 compliance and REACH unaffected status, making them suitable for regulated applications. The CMF5537R400FHEB offers superior thermal performance with a lower temperature coefficient (±50ppm/°C) and extended operating range to 175°C, compared to the main part's ±100ppm/°C and 155°C maximum. The doubled power rating (0.5W vs. 0.25W) provides additional thermal margin in applications with higher current demands. Both parts maintain identical resistance value and tolerance specifications, ensuring functional equivalence in circuit design. Selection between these parts depends on application thermal requirements and power dissipation constraints.

Frequently Asked Questions (FAQ)

Q: Can CMF5537R400FHEB replace RNF14FAD37R4 in existing designs?

A: Yes. Both parts share identical resistance (37.4 Ohms), tolerance (±1%), composition (metal film), and axial package configuration. The substitute part's enhanced power rating and temperature coefficient provide improved performance margins without affecting circuit functionality.

Q: What are the physical dimension differences?

A: RNF14FAD37R4 measures 0.093" diameter × 0.250" length (2.35mm × 6.35mm). CMF5537R400FHEB measures 0.090" diameter × 0.240" length (2.29mm × 6.10mm). Both dimensions are within typical axial resistor tolerances and compatible with standard PCB layouts.

Q: Are there compliance differences between these parts?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS code 8533.21.0090.

Q: Which part should be selected for high-temperature applications?

A: The CMF5537R400FHEB supports operation to 175°C with a superior temperature coefficient of ±50ppm/°C, compared to the RNF14FAD37R4's 155°C maximum and ±100ppm/°C coefficient. For applications approaching or exceeding 155°C, the substitute part is the appropriate selection.

Q: What is the impact of the different packaging formats?

A: RNF14FAD37R4 is supplied in Tape & Box (TB) format, while CMF5537R400FHEB is supplied in Cut Tape (CT) format. Both are standard packaging methods for through-hole resistors and do not affect component performance or PCB assembly compatibility.