VLS4012ET-2R2M Equivalent & Substitute Parts

Part Overview

The VLS4012ET-2R2M is a 2.2 µH shielded drum core wirewound inductor manufactured by TDK Corporation, rated for 1.7 A with a maximum DC resistance of 81 mOhm. This component is designed for surface mount applications in compact form factors (4.00mm x 4.00mm x 1.20mm). The part carries a "Not For New Designs" status, making equivalent substitutes necessary for ongoing production and new design implementations. Substitute parts must maintain the core electrical specifications: 2.2 µH inductance at ±20% tolerance, shielded ferrite core construction, and compatible surface mount packaging.

Substiute Parts

VLS4012ET-2R2M

TDK CorporationIn Stock: 30179VLS4012ET-2R2M Datasheet

Current PartRFQ

VLS3012CX-2R2M-1

TDK CorporationIn Stock: 19953VLS3012CX-2R2M-1 Datasheet

MFR RecommendedRFQ

BWVS004040122R2T00

Pulse ElectronicsIn Stock: 1018BWVS004040122R2T00 Datasheet

MFR RecommendedRFQ

NRS4012T2R2MDGJV

Taiyo YudenIn Stock: 6786NRS4012T2R2MDGJV Datasheet

MFR RecommendedRFQ

SRN4018-2R2M

Bourns Inc.In Stock: 12335SRN4018-2R2M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Electrical Requirements:

• Inductance value: 2.2 µH (±20% tolerance acceptable)
• Core material: Ferrite
• Shielding: Shielded or semi-shielded construction
• Mounting type: Surface Mount

Current and Resistance Considerations:

• Current rating must meet or exceed 1.7 A minimum
• DC resistance should not significantly exceed 81 mOhm to maintain thermal performance
• Saturation current (Isat) must support the application's peak current demands

Physical and Environmental Compatibility:

• Package footprint: 4.00mm x 4.00mm base dimension (height variation acceptable within assembly constraints)
• Operating temperature: -40°C to 105°C minimum range
• RoHS3 compliance required

Substitute Parts Identified:

1. VLS3012CX-2R2M-1 (TDK Corporation) — Active status, improved current rating (2.83 A), reduced DCR (74 mOhm), smaller footprint (3.00mm x 3.00mm)
2. BWVS004040122R2T00 (Pulse Electronics) — Active status, extended temperature range (-55°C to 125°C), standard 1616 package, lower current rating (1.35 A)
3. NRS4012T2R2MDGJV (Taiyo Yuden) — Not for new designs, improved current rating (1.9 A), reduced DCR (72 mOhm), AEC-Q200 rated
4. SRN4018-2R2M (Bourns Inc.) — Active status, highest current rating (2.9 A), lowest DCR (44 mOhm), semi-shielded construction

Parameter Comparison

Engineering Selection Recommendations

For New Designs: Select from active-status parts: VLS3012CX-2R2M-1, BWVS004040122R2T00, or SRN4018-2R2M. The VLS3012CX-2R2M-1 offers the best balance of improved electrical performance (higher current rating, lower DCR) while maintaining TDK supply continuity and identical temperature range. The SRN4018-2R2M provides superior current handling (2.9 A) and lowest DCR (44 mOhm) for high-efficiency applications, though semi-shielded construction may require EMI assessment. The BWVS004040122R2T00 is suitable only if extended temperature operation (-55°C to 125°C) is required and lower current demands (1.35 A) are acceptable.

For Existing Production Transition: The NRS4012T2R2MDGJV provides a direct mechanical and electrical substitute with AEC-Q200 automotive qualification, though it carries "Not For New Designs" status. For long-term supply security, transition to VLS3012CX-2R2M-1 or SRN4018-2R2M.

Compliance Verification: All substitute parts maintain ROHS3 compliance and are suitable for equivalent applications. Verify thermal performance requirements, as DC resistance variations (44–81 mOhm) directly impact power dissipation in high-current circuits.

Frequently Asked Questions (FAQ)

Q: Can VLS3012CX-2R2M-1 replace VLS4012ET-2R2M directly? A: Yes. Both parts share identical inductance (2.2 µH), tolerance (±20%), core material (ferrite), shielding (shielded), and operating temperature range (-40°C to 105°C). The VLS3012CX-2R2M-1 offers improved specifications: higher current rating (2.83 A vs. 1.7 A) and lower DC resistance (74 mOhm vs. 81 mOhm). The smaller footprint (3.00mm vs. 4.00mm) requires PCB layout verification.

Q: What is the difference between shielded and semi-shielded inductors? A: Shielded inductors (VLS4012ET-2R2M, VLS3012CX-2R2M-1, BWVS004040122R2T00, NRS4012T2R2MDGJV) provide complete magnetic field containment, minimizing EMI coupling to adjacent components. Semi-shielded inductors (SRN4018-2R2M) offer partial shielding with lower DC resistance but increased radiated EMI. Selection depends on circuit layout and EMI sensitivity.

Q: Is BWVS004040122R2T00 suitable for applications requiring 1.7 A? A: No. The BWVS004040122R2T00 has a current rating of 1.35 A, below the VLS4012ET-2R2M requirement of 1.7 A. This part is suitable only for applications with lower current demands or where extended temperature operation (-55°C to 125°C) is critical.

Q: Why does SRN4018-2R2M have a taller profile (1.80mm vs. 1.20mm)? A: The increased height accommodates the semi-shielded drum core design and contributes to the superior current rating (2.9 A) and lowest DC resistance (44 mOhm). PCB assembly clearance must be verified before selection.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts (VLS3012CX-2R2M-1, BWVS004040122R2T00, NRS4012T2R2MDGJV, SRN4018-2R2M) are ROHS3 compliant and suitable for applications requiring environmental compliance.

Q: What does "Not For New Designs" status mean? A: This designation indicates the manufacturer is not recommending the part for new circuit designs due to potential supply discontinuation or availability constraints. VLS4012ET-2R2M and NRS4012T2R2MDGJV carry this status. For new designs, select from active-status alternatives: VLS3012CX-2R2M-1, BWVS004040122R2T00, or SRN4018-2R2M.