SMD and Semi-Shielded Inductors Bring High Reliability to Auto, Industrial Apps

The automotive-grade SDE0403AT and SRN5040TA-P Series offer higher current density and low-profile footprints for improved power efficiency and filtering performance.
Oct. 29, 2025
2 min read

What you'll learn:

  • The inductors' features that suit them for sophisticated automotive systems.
  • The magnetic-epoxy coating that ruggedizes the semi-shielded inductors.

Bourns Inc. recently unveiled its SDE0403AT Series of SMD Power Inductors and SRN5040TA-P Series of Semi-Shielded Power Inductors. These automotive-grade, AEC-Q200-compliant SMD power inductors deliver high current density in a low-profile form factor, suiting them for automotive designs requiring exceptional power efficiency and design flexibility. 

The SDE0403AT Series, which handles high currents without saturation and temperatures from −55 to +150°C, is optimized for use in a advanced automotive applications including noise filters and DC power lines. The inductors feature a unique drum ferrite structure with a compact, low form factor, giving designers greater layout flexibility and ease of system integration. 

They support a wide operating temperature range and deliver a high saturation current up to 4.8 A, helping maintain thermal stability in today’s sophisticated automotive systems.

SRN5040TA-P semi-shielded power inductors feature a specialized construction that minimizes magnetic-field radiation while delivering high heating current and saturation current capabilities. In addition, the series supports a wide operating temperature range of −55 to +125°C, making them well-suited for space-constrained automotive applications.

The semi-shielded design utilizes a magnetic-epoxy coating around the winding perimeter. It provides effective EMI suppression and lower magnetic-field radiation compared to non-shielded inductors.

The SDE0403AT and SRN5040TA-P Series are available now. Check here for more detailed product information

About the Author

Lee Goldberg

Contributing Editor

Lee Goldberg is a self-identified “Recovering Engineer,” Maker/Hacker, Green-Tech Maven, Aviator, Gadfly, and Geek Dad. He spent the first 18 years of his career helping design microprocessors, embedded systems, renewable energy applications, and the occasional interplanetary spacecraft. After trading his ‘scope and soldering iron for a keyboard and a second career as a tech journalist, he’s spent the next two decades at several print and online engineering publications.

Lee’s current focus is power electronics, especially the technologies involved with energy efficiency, energy management, and renewable energy. This dovetails with his coverage of sustainable technologies and various environmental and social issues within the engineering community that he began in 1996. Lee also covers 3D printers, open-source hardware, and other Maker/Hacker technologies.

Lee holds a BSEE in Electrical Engineering from Thomas Edison College, and participated in a colloquium on technology, society, and the environment at Goddard College’s Institute for Social Ecology. His book, “Green Electronics/Green Bottom Line - A Commonsense Guide To Environmentally Responsible Engineering and Management,” was published by Newnes Press.

Lee, his wife Catherine, and his daughter Anwyn currently reside in the outskirts of Princeton N.J., where they masquerade as a typical suburban family.

Lee also writes the regular PowerBites series

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