SPM4012T-3R3M Equivalent & Substitute Parts

Part Overview

The SPM4012T-3R3M is a 3.3 µH shielded drum core wirewound inductor manufactured by TDK Corporation, rated for 2.4 A continuous current with a maximum DC resistance of 145mOhm. This component is designed for surface mount applications in compact form factors measuring 4.40mm × 4.10mm × 1.20mm (max height). The part is currently classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity.

Substiute Parts

SPM4012T-3R3M

TDK CorporationIn Stock: 2119SPM4012T-3R3M Datasheet

Current PartRFQ

SPM4012T-3R3M-LR

TDK CorporationIn Stock: 26345SPM4012T-3R3M-LR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPM4012T-3R3M is determined by strict equivalence across the following critical parameters:

Inductance value must remain 3.3 µH with ±20% tolerance to maintain circuit performance and frequency response characteristics. The shielded drum core construction with metal core material must be preserved to ensure electromagnetic compatibility and thermal performance. Surface mount packaging with identical physical dimensions (4.40mm × 4.10mm × 1.20mm max height) is required for mechanical fit in existing PCB layouts. Operating temperature range of -40°C to 125°C must be maintained. Current rating and saturation current specifications may vary within acceptable design margins provided the substitute part meets or exceeds the original part's electrical performance envelope. DC resistance may be lower in substitute parts, which is acceptable as it represents improved efficiency. RoHS3 compliance and MSL 1 rating must be maintained for regulatory and manufacturing process compatibility.

Parameter Comparison

Engineering Selection Recommendations

The SPM4012T-3R3M-LR is the manufacturer-recommended substitute for the obsolete SPM4012T-3R3M. Both components are manufactured by TDK Corporation and maintain identical electrical specifications for inductance, tolerance, and operating temperature range. The substitute part demonstrates improved electrical performance with higher current rating (2.6 A vs. 2.4 A), higher saturation current (4.6 A vs. 2.8 A), and lower DC resistance (126.5mOhm vs. 145mOhm). Physical dimensions and mounting characteristics are identical, ensuring direct PCB compatibility. Both parts maintain ROHS3 compliance and MSL 1 rating, satisfying regulatory and manufacturing requirements. The SPM4012T-3R3M-LR is currently in active production status with substantial inventory availability, providing supply chain continuity and long-term procurement reliability.

Frequently Asked Questions (FAQ)

Q: Can the SPM4012T-3R3M-LR be used as a direct replacement for the SPM4012T-3R3M?

A: Yes. Both parts share identical inductance (3.3 µH), tolerance (±20%), physical dimensions (4.40mm × 4.10mm × 1.20mm), operating temperature range (-40°C to 125°C), and core construction (shielded drum core, metal material). The substitute part meets or exceeds all electrical performance parameters of the original part.

Q: What are the differences between these two parts?

A: The SPM4012T-3R3M-LR provides improved electrical performance with higher current rating (2.6 A vs. 2.4 A), higher saturation current (4.6 A vs. 2.8 A), and lower DC resistance (126.5mOhm vs. 145mOhm). Packaging differs: the original uses Cut Tape & Digi-Reel, while the substitute uses Tape & Reel format. The substitute is in active production status.

Q: Are there any compatibility concerns with PCB layout or assembly?

A: No. Identical physical dimensions and surface mount package specifications ensure direct compatibility with existing PCB designs and assembly processes. No layout modifications are required.

Q: Why is the original part classified as obsolete?

A: The SPM4012T-3R3M has been superseded by the SPM4012T-3R3M-LR in TDK Corporation's product portfolio. The substitute part offers improved performance characteristics and is maintained in active production.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating. Regulatory and manufacturing process requirements are identical.