RNF12FTC3K74 Equivalent & Substitute Parts

Part Overview

The RNF12FTC3K74 is a 3.74 kOhms ±1% metal film axial through-hole resistor rated at 0.5W (1/2W) manufactured by Stackpole Electronics Inc. This component features flame retardant coating and safety-rated construction, designed for applications requiring precision resistance values with high reliability. The part is currently active in production with 1,079 units in stock. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and regulatory compliance can be maintained across alternative manufacturers.

Substiute Parts

RNF12FTC3K74

Stackpole Electronics IncIn Stock: 1164RNF12FTC3K74 Datasheet

Current PartRFQ

CMF553K7400FHEB

Vishay DaleIn Stock: 5328CMF553K7400FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF12FTC3K74 is determined by the following critical parameters:

• Resistance value: 3.74 kOhms (exact match required)
• Tolerance: ±1% (equivalent or tighter tolerance acceptable)
• Power rating: 0.5W minimum (equal or higher acceptable)
• Composition: Metal film (maintains electrical performance characteristics)
• Package: Axial through-hole (mechanical and electrical compatibility)
• Temperature coefficient: ±50ppm/°C or better (stability requirement)
• Operating temperature range: Minimum -55°C to 155°C coverage
• Regulatory compliance: ROHS3 Compliant, REACH Unaffected

The CMF553K7400FHEB from Vishay Dale meets all substitution criteria with identical electrical specifications and enhanced operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

Both the RNF12FTC3K74 and CMF553K7400FHEB are active production components with full ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component manufacturing and use.

The CMF553K7400FHEB provides an extended operating temperature range to 175°C compared to the 155°C maximum of the RNF12FTC3K74, with the addition of moisture-resistant properties. Both components maintain identical electrical performance across the specified operating range of the primary part.

Physical dimensions differ between the two axial packages: the RNF12FTC3K74 measures 0.108" diameter × 0.344" length, while the CMF553K7400FHEB measures 0.090" diameter × 0.240" length. PCB layout and mechanical clearance requirements must be evaluated for board-level compatibility.

Frequently Asked Questions (FAQ)

Q: Can the CMF553K7400FHEB replace the RNF12FTC3K74 in all applications?

A: Electrical substitution is valid when the operating temperature range does not exceed 155°C and physical package dimensions are compatible with the PCB layout. The CMF553K7400FHEB's extended temperature rating to 175°C and moisture-resistant properties provide additional margin in demanding environments.

Q: What is the significance of the ±1% tolerance specification?

A: The ±1% tolerance ensures the actual resistance value remains within 3.7026 kOhms to 3.7774 kOhms. Both parts meet this specification, making them electrically interchangeable for precision circuit applications.

Q: Are there packaging differences that affect component selection?

A: The RNF12FTC3K74 is supplied in Tape & Reel (TR) format, while the CMF553K7400FHEB is supplied in Cut Tape (CT) format. This affects procurement and assembly processes but does not impact electrical or mechanical performance of the individual component.

Q: How do the physical dimensions affect PCB design?

A: The CMF553K7400FHEB is physically smaller (0.090" × 0.240") compared to the RNF12FTC3K74 (0.108" × 0.344"). Existing PCB layouts designed for the larger Stackpole component will accommodate the Vishay Dale part without modification, though the reverse may require design changes.

Q: What does the ±50ppm/°C temperature coefficient mean for circuit stability?

A: The temperature coefficient indicates the resistance value will change by approximately 50 parts per million for each degree Celsius change in operating temperature. Both parts share this specification, ensuring equivalent thermal stability characteristics.