VLS4012ET-470M Equivalent & Substitute Parts

Part Overview

The VLS4012ET-470M is a 47 µH shielded drum core, wirewound inductor manufactured by TDK Corporation, rated for 410 mA with a maximum DC resistance of 1.02Ohm. This surface mount component operates across the temperature range of -40°C to 105°C and is classified as not for new designs. Due to its obsolescence status and limited availability relative to active alternatives, equivalent substitute parts with comparable electrical and mechanical characteristics are available from multiple manufacturers including Pulse Electronics and Bourns Inc.

Key Parameters

Parameter	VLS4012ET-470M
Inductance	47 µH
Inductance Tolerance	±20%
Current Rating	410 mA
DC Resistance (DCR)	1.02Ohm Max
Core Material	Ferrite
Shielding	Shielded
Operating Temperature	-40°C ~ 105°C
Mounting Type	Surface Mount
Package Size	4.00mm x 4.00mm x 1.20mm
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the VLS4012ET-470M is determined by the following critical parameters:

Primary Matching Criteria:

Inductance value: 47 µH (exact match required)
Inductance tolerance: ±20% or tighter
Core material: Ferrite
Shielding type: Shielded or semi-shielded
Mounting type: Surface Mount
RoHS3 compliance

Secondary Compatibility Factors:

Current rating: Minimum 410 mA (equal or higher acceptable)
DC resistance: Lower or equal values preferred for thermal performance
Operating temperature range: Must encompass -40°C to 105°C minimum
Package footprint: 4.00mm x 4.00mm base dimension (height variation acceptable within assembly constraints)

The substitute parts listed below meet these criteria with variations in current saturation ratings, DC resistance values, and package heights that do not compromise functional equivalence for standard circuit applications.

Parameter Comparison

Parameter	VLS4012ET-470M (TDK)	VLS3012CX-470M-1 (TDK)	BWVS00404012470M00 (Pulse)	BWVS00404012470T00 (Pulse)	SRN4018-470M (Bourns)
Manufacturer	TDK Corporation	TDK Corporation	Pulse Electronics	Pulse Electronics	Bourns Inc.
Inductance	47 µH	47 µH	47 µH	47 µH	47 µH
Inductance Tolerance	±20%	±20%	±20%	±30%	±20%
Current Rating (Amps)	410 mA	660 mA	450 mA	450 mA	600 mA
Current - Saturation (Isat)	410 mA	430 mA	310 mA	310 mA	620 mA
DC Resistance (DCR)	1.02Ohm Max	1.477Ohm Max	930mOhm	930mOhm	780mOhm Max
Shielding	Shielded	Shielded	Shielded	Shielded	Semi-Shielded
Core Type	Drum Core, Wirewound	Drum Core, Wirewound	Ferrite	Ferrite	Drum Core, Wirewound
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C
Package Size (L x W)	4.00mm x 4.00mm	3.00mm x 3.00mm	4.00mm x 4.00mm	4.00mm x 4.00mm	4.00mm x 4.00mm
Height - Seated (Max)	1.20mm	1.20mm	1.30mm	1.30mm	1.80mm
Product Status	Not For New Designs	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

VLS3012CX-470M-1 (TDK Corporation): This TDK alternative maintains the same inductance value, tolerance, and operating temperature range as the primary part. It offers improved current handling at 660 mA with comparable DC resistance characteristics. The smaller 3.00mm x 3.00mm footprint requires PCB layout verification but provides space optimization. Active product status ensures long-term availability. Recommended for applications where TDK component continuity is required.

BWVS00404012470M00 and BWVS00404012470T00 (Pulse Electronics): Both Pulse variants maintain the 4.00mm x 4.00mm footprint matching the original part dimensions. These components feature lower DC resistance (930mOhm) compared to the VLS4012ET-470M, reducing thermal dissipation. The extended operating temperature range (-55°C to 125°C) provides broader environmental compatibility. The BWVS00404012470T00 variant carries ±30% inductance tolerance versus ±20% for the M00 version. Both are active products with established supply chains.

SRN4018-470M (Bourns Inc.): The Bourns inductor delivers the highest current rating at 600 mA with the lowest DC resistance at 780mOhm, optimizing thermal performance. Semi-shielded construction and higher self-resonant frequency (10MHz) support higher-frequency applications. The increased height (1.80mm) requires clearance verification in compact assemblies. Active product status and ROHS3 compliance ensure regulatory alignment.

All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), matching the regulatory profile of the original component.

Frequently Asked Questions (FAQ)

Q: Can VLS3012CX-470M-1 be used as a direct replacement despite its smaller footprint?

A: The VLS3012CX-470M-1 maintains electrical equivalence with identical inductance, tolerance, and temperature range. However, the 3.00mm x 3.00mm footprint differs from the original 4.00mm x 4.00mm package. PCB layout and land pattern compatibility must be verified before substitution. If the original PCB is designed for the 4.00mm footprint, adapter considerations or layout redesign may be necessary.

Q: What is the difference between BWVS00404012470M00 and BWVS00404012470T00?

A: Both parts share identical electrical characteristics and physical dimensions. The primary distinction is inductance tolerance: BWVS00404012470M00 specifies ±20% tolerance, while BWVS00404012470T00 specifies ±30% tolerance. Selection depends on circuit tolerance requirements. The M00 variant is preferred for tighter inductance specifications.

Q: Is the SRN4018-470M semi-shielded construction compatible with shielded applications?

A: Semi-shielded construction provides partial electromagnetic containment compared to fully shielded designs. For applications requiring complete shielding to prevent external field interference, fully shielded alternatives (VLS3012CX-470M-1, BWVS variants) are preferred. Semi-shielded performance is acceptable in applications where moderate shielding is sufficient.

Q: Which substitute offers the best thermal performance?

A: The SRN4018-470M features the lowest DC resistance at 780mOhm, resulting in minimal resistive heating. BWVS variants at 930mOhm provide intermediate thermal performance. The VLS3012CX-470M-1 at 1.477Ohm exhibits higher resistive losses. Thermal performance ranking: SRN4018-470M > BWVS variants > VLS3012CX-470M-1.

Q: Are all substitutes rated for the same current as the original VLS4012ET-470M?

A: The VLS4012ET-470M is rated for 410 mA. All substitutes exceed this rating: VLS3012CX-470M-1 (660 mA), BWVS variants (450 mA), and SRN4018-470M (600 mA). Higher current ratings provide design margin and do not compromise performance in applications requiring 410 mA or less.

Q: What are the compliance and regulatory considerations for substitution?

A: All substitute parts maintain ROHS3 compliance, matching the original component's regulatory status. All parts are REACH unaffected and carry EAR99 ECCN classification. Moisture sensitivity level remains MSL 1 (unlimited) across all options, ensuring consistent handling and storage requirements.

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