ASPI-0412S-3R3N-T3 Equivalent & Substitute Parts

Part Overview

The ASPI-0412S-3R3N-T3 is a 3.3 µH shielded drum core, wirewound inductor manufactured by Abracon LLC, rated for 1.15 A continuous current with a maximum DC resistance of 147 mOhm. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -25°C to 100°C and is mounted as a surface mount device in a nonstandard 4.00mm x 4.00mm package footprint.

Substiute Parts

ASPI-0412S-3R3N-T3

Abracon LLCIn Stock: 835ASPI-0412S-3R3N-T3 Datasheet

Current PartRFQ

VLCF4018T-3R3N1R2-2

TDK CorporationIn Stock: 3726VLCF4018T-3R3N1R2-2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ASPI-0412S-3R3N-T3 is determined by strict alignment of the following electrical and mechanical parameters:

• Inductance Value: 3.3 µH with ±30% tolerance
• Current Rating: Minimum 1.15 A continuous current capability
• Saturation Current (Isat): Minimum 1.2 A
• DC Resistance: Lower or equal to 147 mOhm maximum
• Core Type: Ferrite drum core, wirewound construction
• Shielding: Shielded configuration required
• Mounting: Surface mount technology
• Footprint Compatibility: 4.00mm x 4.00mm package dimensions
• Compliance: ROHS3 compliant, MSL 1 rating

The VLCF4018T-3R3N1R2-2 manufactured by TDK Corporation meets all substitution criteria and is classified as an active product with improved electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The VLCF4018T-3R3N1R2-2 is the qualified substitute for the obsolete ASPI-0412S-3R3N-T3. Selection is based on the following engineering criteria:

Product Status: The VLCF4018T-3R3N1R2-2 maintains active product status with ongoing manufacturer support, whereas the ASPI-0412S-3R3N-T3 is obsolete and subject to supply discontinuation.

Compliance Alignment: Both components maintain ROHS3 compliance and MSL 1 moisture sensitivity ratings, ensuring regulatory and environmental compatibility in existing designs.

Electrical Performance: The substitute part demonstrates improved electrical characteristics with higher current rating (1.26 A vs. 1.15 A), higher saturation current (1.26 A vs. 1.2 A), and significantly lower DC resistance (79 mOhm vs. 147 mOhm maximum). These improvements provide enhanced thermal performance and reduced power dissipation.

Thermal Operating Range: The substitute extends the operating temperature range to -40°C to 105°C, providing broader environmental compatibility compared to the original -25°C to 100°C specification.

Mechanical Compatibility: Identical footprint dimensions (4.00mm x 4.00mm) and surface mount configuration ensure direct PCB layout compatibility without redesign requirements.

Frequently Asked Questions (FAQ)

Q: Can the VLCF4018T-3R3N1R2-2 be used as a direct replacement for the ASPI-0412S-3R3N-T3?

A: Yes. Both components share identical inductance values (3.3 µH), tolerance specifications (±30%), footprint dimensions (4.00mm x 4.00mm), and core construction (ferrite drum core, shielded). The substitute meets or exceeds all electrical specifications of the original part.

Q: What are the key differences between these two inductors?

A: The primary differences are product status (active vs. obsolete), current rating (1.26 A vs. 1.15 A), DC resistance (79 mOhm vs. 147 mOhm), and operating temperature range (-40°C to 105°C vs. -25°C to 100°C). The substitute provides improved electrical performance with lower losses and extended thermal operating range.

Q: Are there any package or mounting considerations when substituting?

A: No. Both components are surface mount devices with identical 4.00mm x 4.00mm footprints. No PCB layout modifications or reflow profile adjustments are required for substitution.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the ASPI-0412S-3R3N-T3 and VLCF4018T-3R3N1R2-2 are ROHS3 compliant with MSL 1 moisture sensitivity ratings. Regulatory and environmental compliance requirements are maintained across the substitution.

Q: What is the significance of the lower DC resistance in the substitute part?

A: The VLCF4018T-3R3N1R2-2 exhibits 79 mOhm maximum DC resistance compared to 147 mOhm in the original part. Lower DC resistance reduces I²R power dissipation, resulting in improved thermal performance and reduced heat generation during operation.

Q: Is the substitute part available in the same packaging format?

A: The VLCF4018T-3R3N1R2-2 is supplied in Tape & Reel (TR) packaging, whereas the original part packaging format is not specified. Verify packaging requirements for your procurement and assembly processes.