74F566AP-RC Equivalent & Substitute Parts

Part Overview

The 74F566AP-RC is a 5.6 µH unshielded wirewound inductor manufactured by Bourns Inc., designed for through-hole axial mounting applications. This component is rated for 350 mA maximum current with a DC resistance of 1.8 Ohm and operates across a temperature range of -55°C to 125°C. The product is currently obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

74F566AP-RC

Bourns Inc.In Stock: 102774F566AP-RC Datasheet

Current PartRFQ

1945R-05K

API Delevan Inc.In Stock: 8391945R-05K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74F566AP-RC is determined by the following critical parameters:

• Inductance Value: Must be 5.6 µH with ±10% tolerance to maintain circuit performance
• Mounting Configuration: Through-hole axial package required for mechanical compatibility
• Shielding Type: Unshielded specification must be maintained
• Operating Temperature Range: Must support -55°C to 125°C minimum
• RoHS Compliance: ROHS3 compliance required for regulatory alignment

The 1945R-05K from API Delevan Inc. meets these core substitution criteria. While the substitute exhibits different construction (molded vs. wirewound), core material (iron vs. phenolic), and improved electrical characteristics (lower DCR, higher current rating), these differences represent enhancements rather than deviations from the specified functional requirements.

Parameter Comparison

Engineering Selection Recommendations

The 1945R-05K is a direct functional substitute for the obsolete 74F566AP-RC. Both components maintain identical inductance values, tolerance specifications, and operating temperature ranges. The substitute provides superior electrical performance through reduced DC resistance (340 mOhm vs. 1.8 Ohm) and increased current handling capability (900 mA vs. 350 mA), making it suitable for applications requiring the original component's specifications.

Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility. The substitute's active product status provides ongoing availability and supply chain stability compared to the obsolete original.

Frequently Asked Questions (FAQ)

Q: Can the 1945R-05K directly replace the 74F566AP-RC in existing designs?

A: Yes. Both components share identical inductance values (5.6 µH), tolerance (±10%), operating temperature range (-55°C to 125°C), and axial through-hole mounting configuration. The substitute's improved electrical characteristics do not create incompatibility.

Q: What are the physical dimension differences between these inductors?

A: The 74F566AP-RC measures 0.200" diameter × 0.500" length (5.08mm × 12.70mm). The 1945R-05K measures 0.193" diameter × 0.447" length (4.90mm × 11.35mm). Both are axial through-hole components with compatible mounting footprints for standard PCB applications.

Q: Why does the 1945R-05K have significantly lower DC resistance?

A: The difference in DC resistance (340 mOhm vs. 1.8 Ohm) results from different construction methods. The 1945R-05K uses molded construction with iron core material, while the 74F566AP-RC uses wirewound construction with phenolic core. Lower DCR reduces power dissipation and heat generation in the circuit.

Q: Are there compliance or certification differences between these parts?

A: No. Both components are ROHS3 compliant, REACH unaffected, and classified under the same HTSUS code (8504.50.8000). Regulatory requirements are equivalent.

Q: What is the significance of the different Q factors listed for each part?

A: The Q factor (quality factor) at specified frequencies indicates the ratio of reactive power to dissipated power. The 1945R-05K exhibits higher Q (65 @ 7.9 MHz) compared to the 74F566AP-RC (50 @ 7.96 MHz), reflecting improved efficiency characteristics of the molded construction.