ASPI-0312FSSA-3R3M-T4 Equivalent & Substitute Parts

Part Overview

The ASPI-0312FSSA-3R3M-T4 is a 3.3 µH shielded drum core wirewound inductor manufactured by Abracon LLC, rated for 1.1 A continuous current with 100mOhm DC resistance. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing production and maintenance applications. The part is surface mount, nonstandard package, and compliant with ROHS3 and REACH requirements.

Substiute Parts

ASPI-0312FSSA-3R3M-T4

Abracon LLCIn Stock: 918ASPI-0312FSSA-3R3M-T4 Datasheet

Current PartRFQ

ASPI-0312FS-3R3M-T2

Abracon LLCIn Stock: 1036ASPI-0312FS-3R3M-T2 Datasheet

DirectRFQ

VLS3010ET-3R3M

TDK CorporationIn Stock: 3623VLS3010ET-3R3M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ASPI-0312FSSA-3R3M-T4 are qualified based on the following electrical and mechanical parameters:

Primary Matching Criteria:

• Inductance value: 3.3 µH (±20% tolerance)
• Inductance tolerance: ±20%
• Mounting type: Surface Mount
• Physical dimensions: 3.00mm x 3.00mm footprint
• Shielding: Shielded configuration
• RoHS3 compliance

Secondary Compatibility Parameters:

• Current rating within acceptable operating range (minimum 1.0 A)
• DC resistance comparable to original specification
• Operating temperature range overlap with application requirements
• Saturation current (Isat) sufficient for circuit protection margins

The identified substitutes maintain electrical equivalence through matching inductance, tolerance, and core shielding characteristics while accommodating minor variations in current ratings, DC resistance, and temperature ranges based on specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

ASPI-0312FS-3R3M-T2 (Abracon LLC - Primary Substitute)

This part is the preferred direct substitute. It maintains identical inductance (3.3 µH), tolerance (±20%), DC resistance (100 mOhm), and physical footprint (3.00mm x 3.00mm). The current rating of 1.05 A is marginally lower than the original 1.1 A specification, but remains within acceptable operating margins for most applications. The part is currently in active production status with extended temperature range (-25°C ~ 120°C), providing improved thermal performance. ROHS3 compliance and Tape & Reel packaging ensure compatibility with modern manufacturing processes.

VLS3010ET-3R3M (TDK Corporation - Secondary Substitute)

This TDK part provides electrical equivalence with identical inductance and tolerance specifications. The current rating of 1 A is lower than the original specification, and DC resistance is elevated to 156 mOhm maximum compared to the original 100 mOhm. The part features a reduced height profile (0.039" vs. 0.047"), which may be advantageous for space-constrained applications. However, the product status is classified as "Not For New Designs," limiting its suitability for new development. This part is appropriate for legacy system maintenance where inventory availability is prioritized.

Frequently Asked Questions (FAQ)

Q: Can ASPI-0312FS-3R3M-T2 be used as a direct replacement for ASPI-0312FSSA-3R3M-T4?

A: Yes. Both parts share identical inductance (3.3 µH), tolerance (±20%), DC resistance (100 mOhm), and physical dimensions (3.00mm x 3.00mm). The current rating difference (1.05 A vs. 1.1 A) is within acceptable operating margins for most circuit applications. The ASPI-0312FS-3R3M-T2 is the recommended substitute due to its active production status.

Q: What are the limitations of using VLS3010ET-3R3M as a substitute?

A: The VLS3010ET-3R3M has a lower current rating (1 A vs. 1.1 A) and higher DC resistance (156 mOhm max vs. 100 mOhm). These characteristics may impact circuit performance in applications with tight current or thermal budgets. Additionally, the product is classified as "Not For New Designs," making it unsuitable for new development projects. Use this part only for legacy system maintenance.

Q: Are all substitute parts surface mount compatible with the original PCB layout?

A: All three parts use identical 3.00mm x 3.00mm footprints and surface mount technology. However, the VLS3010ET-3R3M has a reduced height (0.039" vs. 0.047"), which may affect clearance in applications with tight vertical spacing constraints. Verify PCB layout clearances before substitution.

Q: Do all substitute parts meet the same compliance requirements?

A: Yes. All parts listed are ROHS3 compliant and REACH unaffected. Moisture Sensitivity Level (MSL) is rated as 1 (Unlimited) for the main part and VLS3010ET-3R3M, and Not Applicable for ASPI-0312FS-3R3M-T2, indicating no moisture sensitivity concerns for any substitute.

Q: What is the impact of DC resistance variation on circuit performance?

A: The ASPI-0312FS-3R3M-T2 maintains the original 100 mOhm specification. The VLS3010ET-3R3M has 156 mOhm maximum resistance, which increases power dissipation and may affect circuit efficiency. For applications sensitive to inductor losses, the Abracon substitute is preferred.

Q: Can these parts be used interchangeably in production?

A: ASPI-0312FS-3R3M-T2 is recommended for production use due to its active status and identical electrical specifications. VLS3010ET-3R3M should be reserved for legacy maintenance only, as its "Not For New Designs" status indicates limited long-term availability.