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Power Inductor VLS Series – TDK Electronics Factories Inc.

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The VLS series power inductors are magnetic shield (resin) type wound inductors that have been developed taking full advantage of the material technology and manufacturing processes that TDK have accumulated so far.

This type of inductors can largely be classified into three categories: VLS-HBX/HBU series, VLS-CX/CX-H series, and VLS-EX/AF/EX-H/EX-D series; and they show respective excellent features. This article introduces the structure, features, and application purposes of these products, and other information that helps you in an easy-to-understand way.

Product Overview

The VLS-HBX/HBU wire-wound type inductors, use metallic magnetic materials for the core, while the VLS-CX/CX-H series and VLS-EX/AF/EX-H/EX-D series utilize ferrite materials.
In all series, leakage flux is reduced by covering the winding portion with resin containing magnetic material.

Series VLS-HBX VLS-HBU VLS-CX VLS-CX-H VLS-EX VLS-AF VLS-EX-H VLS-EX-D
Product Overview Wire-wound and Magnetic Shield Type Inductor using Metallic Magnetic Materials
Use metallic materials to achieve high current and low RDC
Winding covered with resin containing magnetic material to reduce leakage flux		 Wire-wound and Magnetic Shield Type Inductor Using Ferrite Materials
Optimized core shape from previous models for improved electrical characteristics
Winding covered with resin containing magnetic material to reduce leakage flux		 Wire-wound and Magnetic Shield Type Inductor using Ferrite Materials
Uses optimal structural design to achieve high current and low RDC
Winding area covered with resin containing magnetic material to reduce leakage flux
Features Supports high current due to metallic core
Compact and low-profile, featuring silver electrodes on the terminals.
The HBU series has a high-voltage specification suitable for boost circuits		 Uses ferrite materials to achieve high withstand voltage
Compact and low-profile, featuring silver electrodes on the terminals.
The CX-H series is guaranteed up to 125°C, suitable for automotive applications		 Utilizes metallic terminals, medium-sized around 5-6mm square
The AF series is aimed at applications for sound quality improvement
The EX-H series is guaranteed up to 125°C, and the EX-D series is guaranteed up to 150°C, suitable for automotive applications
Applications VLS-HBX series VLS-HBU series VLS-CX series VLS-CX-H series VLS-EX series VLS-AF series VLS-EX-H series VLS-EX-D series

Smartphones
Tablet devices
Other portable devices

Boost circuits in displays, etc.
Smartphones
Tablet devices
Other portable devices

Smartphones
Tablet devices
Other portable devices

Automotive equipment (up to 125°C)
PoC filters

TVs, STBs, game consoles
Other AV equipment

TVs, STBs, game consoles
Other AV equipment

Automotive equipment (up to 125°C)
PoC filters

Automotive equipment (up to 150°C)
Engine rooms
PoC filters

Product Structure

The structure of the VLS series can be largely divided into two. The VLS-HBX/HBU series and the VLS-CX/CX-H series is smaller and thinner due to the terminal electrode structure.
The VLS-EX/AF/EX-H/EX-D series has metal terminals, and classified as medium-sized products of 5mm and 6mm square.

Figure 2: Product Structure

Series VLS-HBX VLS-HBU VLS-CX VLS-CX-H VLS-EX VLS-AF VLS-EX-H VLS-EX-D
Product Structure

Product Features

Figure 3 shows the features of each VLS series. The VLS-HBU series achieves high withstanding voltage by coating the metal core.
The VLS-CX-H/EX-H series and VLS-EX-D series are automotive products with an operating temperature range of 125°C and 150°C, respectively.

Figure 3: List of Product Features

Series VLS-HBX VLS-HBU VLS-CX VLS-CX-H VLS-EX VLS-AF VLS-EX-H VLS-EX-D
Appearance
Core: Metal Metal + coating Ferrite
Magnetic materials for outer resin Metal Ferrite Metal
Terminal electrode specification Silver electrode + plating Metal terminal + plating
Marking specification/method Polarity/Laser Polarity + L- value/Laser L-value/Laser Polarity + L-value + production serial number/Laser
Applications
Operating temperature range:
(Including self-temperature rise)		 -40°C to 105°C -40°C to 125°C -40°C to 105°C -40°C to 125°C -40°C to 150°C
Features Supports high current
due to metallic core
Low-profile up to 1.2mm height		 High withstand voltage due to metal core coating High withstand voltage due to ferrite core
Low RDC		 Compact, low profile due to silver electrode structure Wide lineup from 0.47 to 680uH Specifications for sound quality improvement Medium size 5-6mm using metal terminals Supports high current due to metallic exterior resin
Supports up to 150°C
Size 2016 to 4mm square 252010,252012 2016 to 4mm square 3 to 4mm square 5 to 6mm square 6mm square 5 to 6mm square 5mm square

For automotive specifications, we have added the VLS5030EX-D series to our lineup, the first of our resin-shielded inductors that can be used in high-temperature environments up to 150°C.
By adopting a resin shield structure that maximizes the core volume and using metallic magnetic materials for the resin shield function, we have achieved superior electrical characteristics compared to our ferrite shield coils of the same size.
Achieves excellent electrical characteristics.

Figure 4: VLS5030EX-D Series for Automotive Specifications

Applications

The optimal VLS series for each application circuit is shown in Figure 5.
The VLS-HBU series is suitable for boost-type DC-DC converters, and the VLS-AF series is suitable for the low-pass filter circuit of D amplifiers.
The automotive grade VLS-EX-D series can be used in high-temperature environments up to 150°C, including engine rooms.

Figure 5: Applications and Products

Applications DC-DC Converter (Buck Type) DC-DC Converter (Boost Type) D Amp Low Pass Filter
Product Series

VLS-HBX
VLS-CX
VLS-EX

VLS-HBU

VLS-AF

VLS-CX-H (～125℃)
VLS-EX-H (～125℃)
VLS-EX-D (～150℃)

In recent years, the use of Power over Coax (PoC), which overlays signals and power on a single coaxial cable between the camera and the ECU to reduce vehicle weight and material cost, has been increasing.
The VLS-CX-H/EX-H/EX-D series can also be used as a PoC filter to separate the necessary signals and power in PoC circuits.

Figure 6: Applications (PoC Filter) and Products

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TDK Electronics Factories, Inc.
TDK Electronics Factories, Inc.

Production of electronic components such as transformers and capacitors

TDK Corporation is a subsidiary of TDK Corporation based in Yurihonjo City, Akita Prefecture, Japan, and is engaged in the manufacture and assembly of electronic components. Specifically, the company manufactures ferrite-based magnetic components and other passive components such as transformers and capacitors.

Our Business

TDK is a comprehensive electronic components manufacturer leading the world in magnetic technology.
TDK began its trajectory by producing the world’s first ferrite cores using a magnetic material called ferrite, and the company is now a large manufacturer of components.
Ferrite is a material with many advantageous properties.
Modern TDK commands a wide range of technologies that make daily life more convenient and pleasant. Our products serve a myriad of applications—they provide critical functionality in smartphones, personal computers, electrical appliances, industrial equipment, and automobiles.
TDK components are vital for progress in many areas.
Meanwhile, the power of magnetics continues to inform our global leadership role.

The role played by TDK components —
Unseen enablers of functionality taken for granted.
Many products that surround our daily lives rely extensively on TDK’s wide palette of electronic components. But because these are used internally, they remain mostly unseen by consumers.
If your electronic devices operate as designed and make your day more enjoyable, that means that the components in them are functioning properly.
But without these electronic components, many things that we take for granted these days might never have come about.

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Inductors for power circuits Wound metal VLS-HBU series VLS252010HBU type

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