VLS4012T-470MR39 Equivalent & Substitute Parts

Part Overview

The VLS4012T-470MR39 is a 47 µH shielded wirewound inductor manufactured by TDK Corporation, rated for 390 mA with a maximum DC resistance of 1.02 Ohm. This surface mount component operates across the temperature range of -40°C to 105°C and is RoHS3 compliant with MSL 1 rating. The part is currently classified as obsolete, making identification of suitable equivalent components essential for ongoing production and design continuity.

Key Parameters

Parameter	Value
Inductance	47 µH
Tolerance	±20%
Current Rating	390 mA
DC Resistance (DCR)	1.02 Ohm Max
Saturation Current (Isat)	410 mA
Shielding	Shielded
Operating Temperature	-40°C ~ 105°C
Mounting Type	Surface Mount
Package Size	4.00mm x 4.00mm
Height (Seated Max)	1.20mm
RoHS Status	RoHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the VLS4012T-470MR39 is determined by the following critical parameters:

Inductance Value: 47 µH (fixed requirement)
Tolerance: ±20% (acceptable range)
Current Rating: Minimum 390 mA required
DC Resistance: Lower values preferred for thermal performance
Saturation Current: Must support operating conditions
Shielding: Shielded configuration required
Package Footprint: 4.00mm x 4.00mm base dimension
Operating Temperature Range: -40°C ~ 105°C minimum
Surface Mount Configuration: Required for PCB compatibility
Compliance: RoHS3 and MSL 1 ratings

The three substitute parts listed maintain the core inductance specification and shielded wirewound construction while offering variations in core material (ferrite drum core), DC resistance characteristics, and current handling capabilities.

Parameter Comparison

Parameter	VLS4012T-470MR39	VLCF4020T-470MR39	VLS4012CX-470M-1	NR4018T470M
Manufacturer	TDK Corporation	TDK Corporation	TDK Corporation	Taiyo Yuden
Inductance	47 µH	47 µH	47 µH	47 µH
Tolerance	±20%	±20%	±20%	±20%
Current Rating (Amps)	390 mA	390 mA	580 mA	420 mA
Saturation Current (Isat)	410 mA	390 mA	460 mA	570 mA
DC Resistance (DCR)	1.02 Ohm Max	934 mOhm Max	1.498 Ohm Max	780 mOhm Max
Shielding	Shielded	Shielded	Shielded	Shielded
Type	Wirewound	Drum Core, Wirewound	Drum Core, Wirewound	Drum Core, Wirewound
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-25°C ~ 120°C
Package Size (L x W)	4.00mm x 4.00mm	4.00mm x 4.00mm	4.00mm x 4.00mm	4.00mm x 4.00mm
Height (Seated Max)	1.20mm	2.00mm	1.20mm	1.80mm
Product Status	Obsolete	Active	Active	Not For New Designs
RoHS Status	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

VLCF4020T-470MR39 (TDK Corporation, Active Status)

This part is the manufacturer-recommended substitute with active product status. It maintains identical inductance, tolerance, and current rating specifications. The DC resistance is reduced to 934 mOhm, providing improved thermal performance. The primary design consideration is the increased seated height of 2.00mm compared to the original 1.20mm, which may require PCB layout verification for clearance constraints.

VLS4012CX-470M-1 (TDK Corporation, Active Status)

This alternative offers higher current rating capability at 580 mA with matching seated height of 1.20mm, maintaining the original form factor. The increased DC resistance of 1.498 Ohm should be evaluated against thermal budget requirements. This part is suitable for applications requiring higher current headroom within the same physical envelope.

NR4018T470M (Taiyo Yuden, Not For New Designs)

This part carries "Not For New Designs" status and should be used only for legacy system maintenance or repair applications. While it provides the lowest DC resistance at 780 mOhm and extended temperature range to 120°C, the product status classification restricts its use for new development initiatives.

Frequently Asked Questions (FAQ)

Q: Can VLCF4020T-470MR39 be used as a direct replacement for VLS4012T-470MR39?

A: VLCF4020T-470MR39 maintains the same inductance value, tolerance, current rating, and operating temperature range. The primary difference is increased seated height (2.00mm vs 1.20mm). PCB layout clearance must be verified before implementation.

Q: What is the significance of the DC resistance differences between substitute parts?

A: DC resistance directly affects power dissipation and thermal performance. Lower DCR values (VLCF4020T-470MR39 at 934 mOhm, NR4018T470M at 780 mOhm) generate less heat than the original 1.02 Ohm specification. VLS4012CX-470M-1 at 1.498 Ohm requires thermal evaluation for applications with continuous current operation.

Q: Why is NR4018T470M marked "Not For New Designs"?

A: This classification indicates the manufacturer has discontinued active support for new product development. While the part meets electrical specifications, it should be reserved for maintenance of existing systems only.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental certifications.

Q: What is the impact of different inductance test frequencies?

A: The original part is tested at 1 MHz, while VLCF4020T-470MR39 and NR4018T470M are tested at 100 kHz. VLS4012CX-470M-1 returns to 1 MHz testing. These frequencies are standard for their respective core material types and do not affect substitution validity.

Q: Can height differences affect circuit performance?

A: Height differences primarily impact PCB layout and clearance considerations. Electrically, the increased height of VLCF4020T-470MR39 (2.00mm) does not affect inductor performance but requires verification of available vertical space in the assembly.

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