ASPI-0418S-150M-T3 Equivalent & Substitute Parts

Part Overview

The ASPI-0418S-150M-T3 is a 15 µH shielded drum core, wirewound inductor manufactured by Abracon LLC, rated for 850 mA continuous current with a maximum DC resistance of 276 mOhm. This component is designed for surface mount applications in nonstandard package configurations. The part is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing production support and design continuity.

Substiute Parts

ASPI-0418S-150M-T3

Abracon LLCIn Stock: 903ASPI-0418S-150M-T3 Datasheet

Current PartRFQ

SRN4018TA-150M

Bourns Inc.In Stock: 15863SRN4018TA-150M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ASPI-0418S-150M-T3 is determined by the following critical parameters:

• Inductance Value: Must be 15 µH with ±20% tolerance
• Current Rating: Minimum 850 mA continuous current capability
• Saturation Current: Minimum 700 mA
• DC Resistance: Maximum 276 mOhm to maintain thermal and efficiency characteristics
• Core Material: Ferrite drum core construction
• Mounting: Surface mount, nonstandard package
• Environmental Compliance: ROHS3 compliance required

The SRN4018TA-150M from Bourns Inc. meets these substitution criteria with equivalent inductance, superior current handling (1.1 A rating), and improved DC resistance (190 mOhm), while maintaining ferrite core construction and surface mount configuration.

Parameter Comparison

Engineering Selection Recommendations

The SRN4018TA-150M is the qualified substitute for the ASPI-0418S-150M-T3 based on the following engineering criteria:

• Inductance Equivalence: Both parts deliver 15 µH with identical ±20% tolerance, ensuring circuit performance parity.
• Current Capability: The SRN4018TA-150M provides 1.1 A rating and 1.1 A saturation current, exceeding the original 850 mA / 700 mA specification, providing design margin.
• DC Resistance Improvement: The substitute's 190 mOhm DCR is superior to the original 276 mOhm maximum, reducing power dissipation and thermal load.
• Compliance Status: Both parts are ROHS3 compliant and REACH unaffected, meeting regulatory requirements.
• Active Production: The SRN4018TA-150M is in active production status with substantial inventory availability (15,852 pcs), ensuring supply continuity.
• Temperature Range Extension: The substitute operates across -40°C ~ 125°C, exceeding the original -25°C ~ 100°C range.
• Shielding Consideration: The substitute features semi-shielded construction versus the original fully shielded design. Applications requiring full shielding performance must evaluate electromagnetic interference (EMI) characteristics for the specific circuit topology.

Frequently Asked Questions (FAQ)

Q: Can the SRN4018TA-150M directly replace the ASPI-0418S-150M-T3 in all applications?

A: The SRN4018TA-150M meets all critical electrical parameters (inductance, current rating, saturation current, and DC resistance) required for functional substitution. However, the shift from fully shielded to semi-shielded construction may affect EMI performance in noise-sensitive applications. Circuit-level evaluation is necessary for applications where shielding effectiveness is a primary design constraint.

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

A: The primary differences are: (1) Shielding type—ASPI-0418S-150M-T3 is fully shielded while SRN4018TA-150M is semi-shielded; (2) DC resistance—190 mOhm versus 276 mOhm, favoring the substitute; (3) Current ratings—1.1 A versus 850 mA, favoring the substitute; (4) Operating temperature range—-40°C ~ 125°C versus -25°C ~ 100°C, favoring the substitute; (5) Product status—active versus obsolete.

Q: Are the physical dimensions compatible?

A: Both inductors use nonstandard package configurations with similar footprints (4.20mm x 4.20mm for ASPI-0418S-150M-T3 and 4.00mm x 4.00mm for SRN4018TA-150M) and identical seated height (1.80mm maximum). PCB layout compatibility should be verified for the specific application.

Q: What certifications apply to the substitute part?

A: The SRN4018TA-150M carries ROHS3 compliance, REACH unaffected status, and AEC-Q200 automotive qualification. These certifications meet or exceed the original part's compliance profile.

Q: Why is the original part obsolete?

A: The ASPI-0418S-150M-T3 is listed as obsolete by the manufacturer. The SRN4018TA-150M from Bourns Inc. is the recommended manufacturer substitute with active production status and superior electrical performance characteristics.