Power Inductor SPM Series – TDK Electronics Factories Inc.
The SPM series power inductors are the metal composite type wire-wound inductors that have the coils integrally molded with metallic magnetic powder.
Compared to ferrite-base wire-wound inductors, the SPM series inductors realize larger current, lower Rdc, smaller size and superior DC bias characteristic. In addition, they ensure low magnetic flux leakage and are effective as a means to suppress acoustic noise of the coil. This article introduces the structure, features, and application of these products, and other information that helps you in an easy-to-understand way.
Product summary
The SPM series are the inductors that have the coils integrally molded with metallic magnetic powder. TDK offers a large selection of the SPM series inductors, including the low-profile SPM-LR series, the SPM-HZ and SPM-V series for automotive applications, and others.
Figure 1: Product summary
| Commercial Grade | Automotive Grade | ||||||
|---|---|---|---|---|---|---|---|
| Series | SPM series Standard specifications | SPM-CT series For high frequency use | SPM-LR series Low-profile model | SPM-XT series Large model | SPM-HZ series | SPM-DZ series | SPM-V series |
| Product summary | The inductors that have the coils integrally molded with magnetic powder. These inductors use Fe-base alloy powder to have high saturation characteristics, i.e. allowing for large current. |
The inductors that have the coils integrally molded with magnetic powder. These inductors use Fe-base alloy powder to have high saturation characteristics, i.e. allowing for large current. A wider operating temperature range than commercial grade products (DZ,V Series) |
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Product structures
Figure 2 shows the structure of each SPM series. The integral mold structure and the welding method for connecting the wire and terminals achieves high reliability.
Figure 2: Product structures
| Commercial Grade | Automotive Grade | ||||||
|---|---|---|---|---|---|---|---|
| Series | SPM | SPM-CT | SPM-LR | SPM-XT | SPM-HZ | SPM-DZ | SPM-V |
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Product features
Figure 3 shows the features of each SPM series.
Figure 3: List of product features
| Series | SPM | SPM-CT | SPM-LR | SPM-XT | SPM-HZ | SPM-DZ | SPM-V |
|---|---|---|---|---|---|---|---|
| Appearance |  |
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| Operating temperature range | -40 to 125°C (including self-temperature rise) |
-55 to 155°C (including self-temperature rise) |
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| Magnetic material | Metallic magnetic material | ||||||
| Terminal electrode specifications | Metal terminal + plating | No joint terminal + plating | Metal terminal + plating | ||||
| Features | Commercial Grade |
Automotive Grade |
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| Standard specifications | High frequency & High Q specifications | Low-profile specifications | Large current specifications | Supports use up to 125°C | Compact, low profile | High inductance High DC superimposition characteristics |
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One of the remarkable features of the SPM series is that they are made with metallic magnetic core. Compared to ferrite cores, metallic magnetic cores have higher magnetic saturation density and better DC bias characteristic. In addition, since their Curie temperature is high, they show only a small change in characteristics with ambient temperature.
Figure 4: Comparison of DC bias characteristic (Metallic magnetic core vs. ferrite core)
Core material characteristics of high magnetic saturation
Superior DC bias characteristic
Figure 5: Change in DC bias characteristic with ambient temperature
Core material characteristics of high Curie temperature
Change in characteristics with ambient temperature is small.
Since the SPM series inductors are made with wire-wound cores integrally molded with metallic magnetic powder, they do not have a core gap and the acoustic noise is reduced. Also, they have good shielding qualities and the magnetic flux leakage is small.
Figure 6: Integral molding for suppressing acoustic noise
Core gapless (integral molding) for suppressing acoustic noise
Contributes to improve the set quality
Figure 7: Comparison of magnetic flux leakage
Shielding structure for low magnetic flux leakage
Effective for reducing EMI
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 SPM-LR series SPM3010-LR type
TDK Electronics Factories, Inc.
Vendor Information
- Store Name: TDK Electronics Factories, Inc.
- Vendor: TDK Electronics Factories, Inc.
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Address:
018-0011
Akita Yurihonjo 1-8, Manganji
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