AISC-1812H-391K-T Equivalent & Substitute Parts

Part Overview

The AISC-1812H-391K-T is a 390 µH unshielded drum core wirewound inductor manufactured by Abracon LLC in 1812 (4532 Metric) surface mount package. This component is rated for 95 mA maximum current with 8.06Ohm DC resistance and operates across -25°C to 85°C. The part is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production continuity.

Substiute Parts

AISC-1812H-391K-T

Abracon LLCIn Stock: 887AISC-1812H-391K-T Datasheet

Current PartRFQ

744045391

Würth ElektronikIn Stock: 1335744045391 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AISC-1812H-391K-T is determined by the following critical parameters:

• Inductance Value: 390 µH with ±10% tolerance
• Package Footprint: 1812 (4532 Metric) surface mount
• Core Configuration: Ferrite, unshielded drum core wirewound
• Current Handling: Minimum 95 mA rating
• DC Resistance: Maximum 8.06Ohm for circuit performance
• Compliance: ROHS3 compliant, REACH unaffected

The Würth Elektronik 744045391 qualifies as a direct substitute based on matching inductance value, package footprint, core type, and compliance certifications. The substitute demonstrates enhanced electrical performance with higher current rating (110 mA) and improved frequency characteristics, making it suitable for the original application while providing additional design margin.

Parameter Comparison

Engineering Selection Recommendations

The 744045391 from Würth Elektronik is a qualified substitute for the obsolete AISC-1812H-391K-T. Both components maintain identical inductance specifications, package footprint, and core configuration. The substitute is currently in active production status, ensuring long-term availability and supply chain continuity.

Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements. The substitute demonstrates superior performance characteristics including higher current rating, extended operating temperature range, and improved self-resonant frequency, providing additional design margin for the application.

The 0.04" (1.0mm) increase in seated height of the substitute must be verified against PCB assembly clearance requirements and mechanical constraints in the target application.

Frequently Asked Questions (FAQ)

Q: Can the 744045391 be used as a direct replacement for AISC-1812H-391K-T?

A: Yes. Both components share identical inductance value (390 µH), tolerance (±10%), package footprint (1812 / 4532 Metric), and core configuration (ferrite, unshielded, drum core). The substitute meets or exceeds the original part's electrical specifications.

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

A: The 744045391 has 13Ohm maximum DCR compared to 8.06Ohm in the original. This difference affects power dissipation and circuit performance. Circuit analysis is required to determine if the increased resistance is acceptable for the specific application.

Q: Are there package compatibility concerns?

A: Both parts use the 1812 (4532 Metric) surface mount package with identical length and width (0.177" x 0.126"). The substitute has a maximum seated height of 0.114" versus 0.110" for the original. Verify clearance in your PCB assembly design.

Q: What compliance certifications apply to both parts?

A: Both the original and substitute are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and use.

Q: Why is the original part obsolete?

A: The AISC-1812H-391K-T is marked as obsolete by Abracon LLC. The Würth Elektronik 744045391 is an active production part with confirmed inventory availability.