74F476AP-RC Equivalent & Substitute Parts

Part Overview

The 74F476AP-RC is a 4.7 µH unshielded wirewound inductor manufactured by Bourns Inc., rated for 400 mA continuous current with a maximum DC resistance of 1 Ohm. Designed for through-hole axial mounting, this component operates across the industrial temperature range of -55°C to 125°C and maintains RoHS3 compliance.

The 74F476AP-RC is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this inductor.

Substiute Parts

74F476AP-RC

Bourns Inc.In Stock: 170774F476AP-RC Datasheet

Current PartRFQ

1945R-04K

API Delevan Inc.In Stock: 9701945R-04K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74F476AP-RC is determined by the following critical parameters:

Mandatory Matching Criteria:

• Inductance value: 4.7 µH (±10% tolerance acceptable)
• Inductance tolerance: ±10%
• Mounting type: Through hole axial configuration
• Shielding classification: Unshielded
• Operating temperature range: -55°C to 125°C minimum

Current Rating Consideration: The 74F476AP-RC is rated for 400 mA. Substitute parts must maintain a current rating equal to or greater than 400 mA to ensure equivalent or superior performance in the original application circuit.

DC Resistance: The maximum DC resistance specification of 1 Ohm for the 74F476AP-RC establishes the upper limit for acceptable substitutes. Lower DCR values in substitute parts indicate improved efficiency and reduced power dissipation.

The 1945R-04K meets all mandatory matching criteria and exceeds the current rating requirement, qualifying it as a direct substitute for the obsolete 74F476AP-RC.

Parameter Comparison

Engineering Selection Recommendations

The 1945R-04K from API Delevan Inc. is qualified as a direct substitute for the obsolete 74F476AP-RC based on the following engineering criteria:

Electrical Equivalence: Both components share identical inductance values (4.7 µH) and tolerance specifications (±10%), ensuring functional compatibility in circuit applications.

Current Capacity: The 1945R-04K provides 1 A current rating, exceeding the 400 mA requirement of the original 74F476AP-RC. This superior current handling capability ensures the substitute operates within safe margins in the original application.

Thermal Compatibility: Both inductors maintain the same operating temperature range (-55°C to 125°C), confirming thermal envelope compatibility.

Compliance Status: The 1945R-04K maintains active product status with current RoHS3 compliance certification, ensuring ongoing availability and regulatory alignment. The 74F476AP-RC, classified as obsolete, presents supply chain risk.

Physical Form Factor: Both components utilize through-hole axial mounting with comparable dimensional specifications, supporting direct mechanical integration into existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can the 1945R-04K replace the 74F476AP-RC in all applications?

A: Yes. The 1945R-04K meets all mandatory electrical and mechanical parameters required for substitution: identical inductance value, matching tolerance, equivalent operating temperature range, and through-hole axial mounting. The higher current rating (1 A vs. 400 mA) and lower DC resistance (280 mOhm vs. 1 Ohm Max) represent performance improvements.

Q: What is the significance of the lower DC resistance in the 1945R-04K?

A: The 1945R-04K exhibits 280 mOhm DC resistance compared to the 74F476AP-RC maximum of 1 Ohm. Lower DC resistance reduces resistive losses and power dissipation in the inductor, improving circuit efficiency without affecting the inductance value or functional behavior.

Q: Are there physical size differences between these components?

A: Both inductors are through-hole axial components with similar dimensional profiles. The 74F476AP-RC measures 0.200" diameter × 0.500" length (5.08mm × 12.70mm), while the 1945R-04K measures 0.193" diameter × 0.447" length (4.90mm × 11.35mm). These minor dimensional variations do not prevent direct mechanical substitution in standard PCB layouts.

Q: What is the difference between wirewound and molded inductor construction?

A: The 74F476AP-RC uses wirewound construction with a phenolic core, while the 1945R-04K employs molded construction with an iron core. Both construction methods achieve the specified 4.7 µH inductance value. The molded design of the 1945R-04K provides improved mechanical robustness and consistent performance characteristics.

Q: Does the packaging format affect substitution compatibility?

A: The 74F476AP-RC is supplied in standard through-hole format, while the 1945R-04K is available in Tape & Reel (TR) packaging. Packaging format does not affect electrical or mechanical compatibility; it reflects supply chain and manufacturing logistics. Both components are suitable for manual or automated PCB assembly processes.

Q: Are both components RoHS compliant?

A: Yes. Both the 74F476AP-RC and 1945R-04K maintain RoHS3 compliance certification, confirming adherence to hazardous substance restrictions and supporting regulatory requirements for electronic equipment manufacturing and distribution.