VLS3012ET-4R7M Equivalent & Substitute Parts

Part Overview

The VLS3012ET-4R7M is a 4.7 µH shielded drum core wirewound inductor manufactured by TDK Corporation, rated for 950 mA with a maximum DC resistance of 156 mOhm. This surface mount component operates across the temperature range of -40°C to 105°C and is ROHS3 compliant. The part is classified as "Not For New Designs," making identification of suitable substitute components essential for ongoing production and design continuity.

Key Parameters

Parameter	Value
Inductance	4.7 µH
Inductance Tolerance	±20%
Current Rating	950 mA
DC Resistance (DCR)	156 mOhm Max
Shielding	Shielded
Core Material	Ferrite
Mounting Type	Surface Mount
Package Size	3.00mm x 3.00mm x 1.20mm (Max Height)
Operating Temperature	-40°C to 105°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the VLS3012ET-4R7M is determined by the following critical parameters:

Inductance Value: Must be 4.7 µH with tolerance of ±20% or tighter
Current Rating: Must meet or exceed 950 mA
DC Resistance: Must not exceed 156 mOhm to maintain circuit performance
Shielding: Must be shielded to prevent electromagnetic interference
Core Material: Must be ferrite-based
Package Footprint: Must accommodate 3.00mm x 3.00mm surface mount placement
Operating Temperature Range: Must cover the minimum -40°C to 105°C specification
Compliance: Must maintain ROHS3 compliance

Substitute parts are grouped into two categories: direct TDK series alternatives and cross-manufacturer equivalents from Pulse Electronics, Taiyo Yuden, and Bourns Inc. All candidates maintain the core electrical specifications while offering varying levels of performance enhancement or alternative availability.

Parameter Comparison

Part Number	Manufacturer	Inductance	Tolerance	Current Rating	DCR (Max)	Isat	Operating Temp	Product Status	Package Size
VLS3012ET-4R7M	TDK Corporation	4.7 µH	±20%	950 mA	156 mOhm	950 mA	-40°C to 105°C	Not For New Designs	3.00mm x 3.00mm
VLS3012CX-4R7M-1	TDK Corporation	4.7 µH	±20%	1.75 A	166 mOhm	1.31 A	-40°C to 105°C	Active	3.00mm x 3.00mm
BWVF003030124R7M00	Pulse Electronics	4.7 µH	±20%	1.52 A	180 mOhm	1.56 A	-55°C to 125°C	Active	3.00mm x 3.00mm
BWVF003030124R7T00	Pulse Electronics	4.7 µH	±30%	1.36 A	180 mOhm	1.4 A	-55°C to 125°C	Active	3.00mm x 3.00mm
NR3012T4R7M	Taiyo Yuden	4.7 µH	±20%	980 mA	156 mOhm	770 mA	-25°C to 120°C	Not For New Designs	3.00mm x 3.00mm
SRU2016-4R7Y	Bourns Inc.	4.7 µH	±30%	1.15 A	215 mOhm	740 mA	-40°C to 125°C	Active	2.80mm x 2.80mm

Engineering Selection Recommendations

Primary Substitute: VLS3012CX-4R7M-1 (TDK Corporation)

This part maintains TDK series continuity with Active product status, ensuring long-term availability. It exceeds the original current rating specification (1.75 A vs. 950 mA) while maintaining identical inductance tolerance and operating temperature range. The DCR increase from 156 mOhm to 166 mOhm remains within acceptable circuit margins for most applications. ROHS3 compliance is maintained.

Secondary Substitute: BWVF003030124R7M00 (Pulse Electronics)

This cross-manufacturer option provides Active status with extended operating temperature range (-55°C to 125°C). Current rating of 1.52 A exceeds the original specification. The DCR of 180 mOhm represents a measurable increase; circuit thermal performance should be evaluated for applications sensitive to inductor losses. ROHS3 compliance is maintained.

Alternative Substitute: NR3012T4R7M (Taiyo Yuden)

This part provides near-identical electrical specifications to the original (980 mA vs. 950 mA current rating, 156 mOhm DCR match). However, it carries "Not For New Designs" status, limiting its suitability for long-term production. Operating temperature range is narrower (-25°C to 120°C). Use only when inventory continuity is critical and thermal environment permits.

Not Recommended: BWVF003030124R7T00 (Pulse Electronics)

While Active status is favorable, the ±30% inductance tolerance and 1.36 A current rating represent degraded specifications relative to the original. The 180 mOhm DCR also increases losses. This part should be considered only when thermal margin and inductance tolerance are non-critical.

Not Recommended: SRU2016-4R7Y (Bourns Inc.)

The 2.80mm x 2.80mm footprint differs from the original 3.00mm x 3.00mm specification, requiring PCB layout modification. The ±30% inductance tolerance and 215 mOhm DCR represent significant performance degradation. Current rating of 1.15 A is marginal relative to the 950 mA original specification.

Frequently Asked Questions (FAQ)

Q: Can VLS3012CX-4R7M-1 be used as a direct drop-in replacement?

A: Yes. The VLS3012CX-4R7M-1 maintains identical footprint (3.00mm x 3.00mm), inductance value (4.7 µH), and operating temperature range (-40°C to 105°C). The higher current rating (1.75 A) and marginally higher DCR (166 mOhm vs. 156 mOhm) are compatible with circuits designed for the original part.

Q: What is the impact of increased DC resistance in substitute parts?

A: DC resistance directly affects inductor power loss and thermal performance. The original VLS3012ET-4R7M specifies 156 mOhm maximum. Substitutes with higher DCR values (166 mOhm, 180 mOhm, 215 mOhm) will generate proportionally more heat. For applications with tight thermal budgets or high-frequency switching, measure actual temperature rise during circuit validation.

Q: Why is SRU2016-4R7Y not recommended despite Active status?

A: The SRU2016-4R7Y uses a different footprint (2.80mm x 2.80mm vs. 3.00mm x 3.00mm), requiring PCB redesign. Additionally, the ±30% inductance tolerance and 215 mOhm DCR represent significant performance degradation compared to the original specification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the original VLS3012ET-4R7M certification status.

Q: What is the difference between "Active" and "Not For New Designs" product status?

A: "Active" status indicates the manufacturer continues production and supports long-term availability. "Not For New Designs" indicates the part is in end-of-life phase with limited future availability. For new production designs, prioritize Active status parts (VLS3012CX-4R7M-1, BWVF003030124R7M00, SRU2016-4R7Y).

Q: Can inductance tolerance differences affect circuit performance?

A: Yes. The original VLS3012ET-4R7M specifies ±20% tolerance. Substitutes with ±30% tolerance (BWVF003030124R7T00, SRU2016-4R7Y) introduce wider inductance variation. For circuits with tight frequency response or impedance matching requirements, validate performance across the full tolerance range.

Q: What operating temperature range should I select?

A: The original part operates -40°C to 105°C. Substitutes offering extended ranges (-55°C to 125°C) provide additional margin for extreme environment applications. Select based on your actual operating environment; extended range is not necessary for standard industrial or consumer applications.

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