70F393AI-RC Equivalent & Substitute Parts

Part Overview

The 70F393AI-RC is a 3.9 mH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 51 mA maximum current with 57.6Ohm DC resistance. This component is designed for through-hole axial mounting applications requiring fixed inductance in the millihenry range. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity.

Substiute Parts

70F393AI-RC

Bourns Inc.In Stock: 98970F393AI-RC Datasheet

Current PartRFQ

AIAP-01-392K-T

Abracon LLCIn Stock: 10772AIAP-01-392K-T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 70F393AI-RC is determined by the following critical parameters:

• Inductance Value: Must be 3.9 mH (primary functional requirement)
• Mounting Type: Must be through-hole axial configuration
• Core Configuration: Wirewound construction without shielding
• Current Rating: Must meet or exceed 51 mA minimum requirement
• DC Resistance: Lower DCR values are acceptable as they indicate improved efficiency
• Compliance: RoHS3 compliance required for modern procurement standards

The AIAP-01-392K-T from Abracon LLC meets these substitution criteria with matching inductance, through-hole axial mounting, wirewound construction, and superior current rating (77 mA vs. 51 mA). The lower DCR (34Ohm vs. 57.6Ohm) represents an improvement in electrical performance.

Parameter Comparison

Engineering Selection Recommendations

The AIAP-01-392K-T is a direct functional substitute for the 70F393AI-RC based on the following engineering criteria:

Compliance & Availability: The AIAP-01-392K-T maintains ROHS3 compliance and carries active product status with substantial inventory availability (10,748 pcs), ensuring long-term procurement viability compared to the obsolete 70F393AI-RC.

Electrical Performance: Both inductors provide identical 3.9 mH inductance at the specified test frequency. The AIAP-01-392K-T offers superior current handling (77 mA vs. 51 mA) and reduced DC resistance (34Ohm vs. 57.6Ohm), resulting in lower power dissipation and improved thermal performance in the application circuit.

Temperature Operating Range: The AIAP-01-392K-T operates across -40°C to 105°C, which covers the majority of industrial and commercial applications. Applications requiring the extended -55°C lower limit of the original part require specific thermal analysis.

Tolerance Consideration: The AIAP-01-392K-T specifies ±10% inductance tolerance versus ±5% for the original part. Circuit designs dependent on tighter tolerance specifications require component-level verification.

Frequently Asked Questions (FAQ)

Q: Can the AIAP-01-392K-T directly replace the 70F393AI-RC in existing PCB designs?

A: Yes, for applications operating within -40°C to 105°C. Both components feature identical axial through-hole mounting and 3.9 mH inductance. Physical dimensions differ slightly (AIAP-01-392K-T: 0.130" Dia x 0.360" L vs. 70F393AI-RC: 0.270" Dia x 0.380" L), requiring PCB footprint verification. The improved electrical characteristics (higher current rating, lower DCR) are compatible with existing circuit designs.

Q: What is the impact of the ±10% tolerance on the AIAP-01-392K-T versus ±5% on the original part?

A: The AIAP-01-392K-T tolerance is wider by 5 percentage points. For circuits with inductance-critical functions (resonant frequency tuning, filter cutoff specifications), tolerance stack analysis is required. Most general-purpose inductor applications tolerate ±10% variation without performance degradation.

Q: Is the lower DC resistance of the AIAP-01-392K-T (34Ohm vs. 57.6Ohm) a concern?

A: Lower DC resistance is an electrical improvement, not a concern. It reduces I²R power losses and heat generation. Applications designed for the original 57.6Ohm DCR will experience improved efficiency with the 34Ohm substitute.

Q: What is the significance of the different self-resonant frequencies?

A: The 70F393AI-RC exhibits 760 kHz self-resonant frequency versus 480 kHz for the AIAP-01-392K-T. This difference reflects physical construction variations. For applications operating below these frequencies (typical for 3.9 mH inductors), this parameter does not affect functional compatibility.

Q: Are both parts RoHS3 compliant?

A: Yes, both the 70F393AI-RC and AIAP-01-392K-T are ROHS3 compliant and REACH unaffected, meeting modern environmental and regulatory requirements.