VLS4012ET-4R7M Equivalent & Substitute Parts

Part Overview

The VLS4012ET-4R7M is a 4.7 µH shielded drum core wirewound inductor manufactured by TDK Corporation, rated for 1.2 A maximum current with 118mOhm DC resistance. This surface mount component operates across -40°C to 105°C and is ROHS3 compliant. The part is designated as "Not For New Designs," making identification of suitable alternatives essential for ongoing production and new applications requiring equivalent electrical performance.

Substiute Parts

VLS4012ET-4R7M

TDK CorporationIn Stock: 85745VLS4012ET-4R7M Datasheet

Current PartRFQ

VLS3012CX-4R7M-1

TDK CorporationIn Stock: 12177VLS3012CX-4R7M-1 Datasheet

MFR RecommendedRFQ

BWVS004040124R7T00

Pulse ElectronicsIn Stock: 1120BWVS004040124R7T00 Datasheet

MFR RecommendedRFQ

NRS4012T4R7MDGJV

Taiyo YudenIn Stock: 17602NRS4012T4R7MDGJV Datasheet

MFR RecommendedRFQ

SRN4018-4R7M

Bourns Inc.In Stock: 27227SRN4018-4R7M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the VLS4012ET-4R7M is determined by the following critical parameters:

• Inductance Value: Must be 4.7 µH (±20% tolerance acceptable)
• Current Rating: Minimum 1.2 A; higher ratings provide design margin
• DC Resistance: Maximum 118mOhm; lower values reduce power dissipation
• Shielding: Shielded or semi-shielded configuration required
• Core Material: Ferrite drum core wirewound construction
• Mounting: Surface mount, nonstandard package footprint (4.00mm x 4.00mm)
• Temperature Range: Minimum -40°C to 105°C coverage required

All four substitute parts meet these core electrical and mechanical criteria. Variations in current saturation ratings, DC resistance values, and package height are acceptable within the functional envelope of this inductor category.

Parameter Comparison

Engineering Selection Recommendations

VLS3012CX-4R7M-1 (TDK): Recommended as the primary substitute. Active product status ensures long-term availability. Higher current rating (1.75 A) and saturation current (1.31 A) provide design margin above the original 1.2 A specification. Identical operating temperature range and ROHS3 compliance. Smaller footprint (3.00mm x 3.00mm) requires PCB layout verification. Identical height (1.20mm) maintains assembly compatibility.

SRN4018-4R7M (Bourns Inc.): Active product with superior electrical performance. Lowest DC resistance (84mOhm Max) reduces power dissipation. Highest current rating (1.9 A) and saturation current (2.0 A) offer maximum design margin. Extended temperature range (-40°C to 125°C) exceeds original specification. Semi-shielded configuration acceptable for most applications. Increased height (1.80mm) requires clearance verification on PCB.

NRS4012T4R7MDGJV (Taiyo Yuden): Designated "Not For New Designs" status limits suitability for new applications. Current rating (1.5 A) and DC resistance (114mOhm Max) closely match original specifications. AEC-Q200 rating provides automotive-grade qualification. Identical package dimensions and height to original part. Extended temperature range (-40°C to 125°C) provides operational margin.

BWVS004040124R7T00 (Pulse Electronics): Current rating (1.08 A) falls below original 1.2 A specification and requires application review. Lowest DC resistance (110mOhm) among all options. Wider tolerance (±30%) compared to original (±20%) may impact circuit performance. Extended temperature range (-55°C to 125°C) exceeds requirements. Identical footprint (4.00mm x 4.00mm) and minimal height increase (1.30mm) support direct substitution.

Frequently Asked Questions (FAQ)

Q: Can VLS3012CX-4R7M-1 be used as a direct replacement despite the smaller footprint?

A: The VLS3012CX-4R7M-1 has a 3.00mm x 3.00mm footprint compared to the original 4.00mm x 4.00mm. PCB layout verification is required to confirm pad spacing compatibility. Identical height (1.20mm) supports assembly without modification.

Q: Why does BWVS004040124R7T00 have a lower current rating than the original part?

A: The BWVS004040124R7T00 is rated for 1.08 A maximum current, below the VLS4012ET-4R7M specification of 1.2 A. Application current requirements must be reviewed to determine if this part is suitable for your circuit.

Q: What is the significance of "Not For New Designs" status?

A: Parts marked "Not For New Designs" are in mature or end-of-life phases. VLS4012ET-4R7M and NRS4012T4R7MDGJV carry this designation. Active alternatives (VLS3012CX-4R7M-1 and SRN4018-4R7M) are recommended for new product development to ensure long-term supply continuity.

Q: How do DC resistance differences affect circuit performance?

A: DC resistance directly impacts power dissipation and voltage drop across the inductor. Lower DCR values (SRN4018-4R7M at 84mOhm) reduce heat generation. Higher values (VLS3012CX-4R7M-1 at 166mOhm) increase dissipation. Selection depends on thermal budget and efficiency requirements.

Q: Are all substitutes compatible with the same PCB assembly process?

A: All parts are surface mount with identical or compatible package heights (1.20mm to 1.80mm). Footprint differences (3.00mm vs 4.00mm) require pad layout verification. Reflow temperature profiles remain consistent across all ferrite drum core wirewound inductors.

Q: What does the ±30% tolerance on BWVS004040124R7T00 mean for circuit design?

A: The ±30% tolerance allows inductance variation from 3.29 µH to 6.11 µH. This wider tolerance compared to ±20% on other parts may affect filter response, impedance matching, or resonant frequency calculations. Circuit simulation should verify performance across the tolerance band.

Q: Why do some parts list different inductance test frequencies?

A: VLS4012ET-4R7M and VLS3012CX-4R7M-1 use 1 MHz test frequency, while others use 100 kHz. Inductance values are frequency-dependent. Comparison at identical test frequency is recommended for precise circuit analysis, though the 4.7 µH nominal value remains consistent across all parts.