TDK SPM Series Power Inductors

The SPM Series power inductors are metal composite wound inductors fabricated by integrally molding coils with metallic magnetic materials. Compared with ferrite wound inductors, they deliver high current capability, low DC resistance (Rdc) and compact dimensions, alongside excellent DC bias characteristics. Additionally, their low magnetic flux leakage effectively suppresses coil acoustic noise.

Product Overview

The SPM Series consists of integrally molded inductors with coils embedded in metallic magnetic materials. It features an extensive lineup including the low-profile SPM-LR Series, and automotive-grade variants such as the SPM-HZ, SPM-HZR, SPM-DZ and SPM-V Series.

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Product Summary

General Grade

The winding coils of the inductors are integrally molded with magnetic materials. Iron-based alloy magnetic materials are adopted to achieve high saturation current.

Automotive Grade

The winding coils of the inductors are integrally molded with magnetic materials. Iron-based alloy magnetic materials are adopted to achieve high saturation current and meet automotive application requirements.The DZ and V Series support a wider operating temperature range than general-grade models.

Key Features

General Grade

1. High Curie temperature; performance barely affected by ambient temperature fluctuations

2. Integrally molded coil with metallic magnetic material reduces acoustic noise and magnetic flux leakage

• SPM-CT (High-Frequency Type)Adopts proprietary alloy magnetic material for low loss under high-frequency operation

• SPM-LR (Low-Profile Type)L-shaped structure for ultra-low profile designCompact size ranging from 3 mm² to 5 mm²

• Standard SPMExtensive product lineup covering footprint sizes of 4 mm² to 10 mm²High mass production efficiency

Automotive Grade (SPM-HZ/HZR / DZ / V)

1. High Curie temperature; performance barely affected by ambient temperature fluctuations

2. Integrally molded coil with metallic magnetic material reduces acoustic noise and magnetic flux leakage

3. Compliant with AEC-Q200 automotive component standards

4. Extensive product lineup covering footprint sizes of 4 mm² to 10 mm²

5. High mass production efficiency

6. Compact low-profile form factor

7. Excellent vibration resistance: 30 G

8. High inductance values

9. Superior DC bias characteristics

10. Inductance range from 0.1 μH to 100 μH

Applications

General Grade

• LCD TVs & high-definition monitors

• Consumer entertainment devices

• Other audio & video equipment

• Wireless chargers

• IJP magnetic head drivers

• Notebook computers

• Tablet PCs

• Game consoles

Automotive Grade

• Car audio systems

• Vehicle navigation units

• ADAS (Advanced Driver Assistance Systems)

• Engine Start/Stop systems

• Engine ECUs (Electronic Control Units)

• Automotive LED lighting systems

Supplementary Technical Introduction

Power inductors, also known as power coils or power chokes, are inductors designed for power circuits such as DC-DC converters. Inductors store energy via self-induction. DC-DC converters and other chopper circuits rely on the combination of power inductors and switching devices to convert voltage levels. (See Figure 9)

Inductors are categorized by manufacturing process into multilayer, thin-film and wound types. Wound inductors dominate the power inductor market due to their high current handling capacity; various product variants are built with ferrite or soft metal magnetic cores. Meanwhile, multilayer and thin-film inductors, which support miniaturization and low-profile designs, have been continuously optimized for higher current ratings in recent years.