73F393AF-RC Equivalent & Substitute Parts

Part Overview

The 73F393AF-RC is a 3.9 mH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 125 mA maximum current with 18 Ohm DC resistance. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The part operates across the temperature range of -55°C to 105°C and meets ROHS3 compliance requirements.

Substiute Parts

73F393AF-RC

Bourns Inc.In Stock: 111673F393AF-RC Datasheet

Current PartRFQ

2474R-44J

API Delevan Inc.In Stock: 8912474R-44J Datasheet

SimilarRFQ

AIAP-02-392K

Abracon LLCIn Stock: 1123AIAP-02-392K Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the 73F393AF-RC is determined by the following critical parameters:

• Inductance Value: 3.9 mH (primary electrical requirement)
• Inductance Tolerance: ±5% or tighter
• Current Rating: Minimum 125 mA (must support or exceed the original specification)
• DC Resistance: Maximum 18 Ohm (electrical performance constraint)
• Shielding Configuration: Unshielded (electromagnetic compatibility requirement)
• Mounting Type: Through Hole Axial (mechanical compatibility)
• Operating Temperature Range: Must encompass or exceed -55°C to 105°C
• RoHS Compliance: ROHS3 Compliant (regulatory requirement)

Two active substitute parts meet these criteria with acceptable parameter variations within engineering tolerances.

Parameter Comparison

Engineering Selection Recommendations

2474R-44J (API Delevan Inc.) is the primary substitute for the 73F393AF-RC. This part maintains identical inductance and tolerance specifications while providing superior electrical performance with lower DC resistance (8.63 Ohm vs. 18 Ohm) and higher current rating (200 mA vs. 125 mA). The extended operating temperature range (-55°C to 125°C) exceeds the original specification. Active product status ensures long-term availability and supply chain continuity. ROHS3 compliance is maintained.

AIAP-02-392K (Abracon LLC) serves as a secondary substitute option. This wirewound inductor matches the core construction type of the original part and provides equivalent electrical performance with lower DC resistance and higher current rating. However, the inductance tolerance is wider (±10% vs. ±5%), and the operating temperature range (-40°C to 85°C) does not fully encompass the original specification's lower temperature limit. Active product status and ROHS3 compliance are confirmed.

Selection between these substitutes depends on application-specific requirements for temperature range and inductance tolerance. For applications requiring the full -55°C to 105°C operating range, 2474R-44J is the appropriate choice. For applications operating within -40°C to 85°C with tolerance for ±10% inductance variation, AIAP-02-392K is acceptable.

Frequently Asked Questions (FAQ)

Q: Can 2474R-44J directly replace 73F393AF-RC in all applications?

A: Yes, within the specified operating temperature range. The 2474R-44J meets or exceeds all critical electrical parameters: identical inductance value and tolerance, higher current rating, and lower DC resistance. The extended temperature range provides additional operational margin.

Q: What is the impact of lower DC resistance in the substitute parts?

A: Lower DC resistance (8.63 Ohm vs. 18 Ohm) reduces resistive losses in the inductor, resulting in improved efficiency and lower heat generation. This is a beneficial characteristic for circuit performance and does not create compatibility issues.

Q: Why does AIAP-02-392K have a wider inductance tolerance?

A: The ±10% tolerance specification reflects the manufacturing process and design approach of Abracon's wirewound inductor. For applications sensitive to inductance variation, verify that the ±10% tolerance remains within acceptable circuit performance margins. The 2474R-44J maintains the original ±5% tolerance.

Q: Are there physical size differences between these parts?

A: Yes. The 73F393AF-RC measures 0.510" diameter × 0.625" length. The 2474R-44J measures 0.240" diameter × 0.740" length. The AIAP-02-392K measures 0.252" diameter × 0.551" length. Verify PCB layout and mechanical clearances before substitution.

Q: What is the difference between drum core and molded construction?

A: The original 73F393AF-RC uses drum core wirewound construction. The 2474R-44J uses molded construction, which provides different mechanical robustness and thermal characteristics. Both are unshielded ferrite-based inductors suitable for the same electrical applications. The AIAP-02-392K maintains wirewound construction similar to the original.

Q: Are all substitute parts RoHS compliant?

A: Yes. Both 2474R-44J and AIAP-02-392K are ROHS3 compliant, matching the original part's regulatory status.