Automotive grade, high power inductors

May 29, 2015 // By Graham Prophet
Eaton’s Coiltronics HCMA Series of high current power inductors meet and exceed the Automotive Electronics Council’s (AEC) Q200 Grade 3 standard with a maximum total temperature operation range from -55 to 125C.

The inductors are designed to withstand temperature and shock stresses found in automotive applications to support greater reliability in electronics for Advanced Drive Assistance Systems (ADAS), vehicle control, body control, lighting, infotainment, cluster controls, heating and air conditioning, chassis and safety systems.

Eaton designed, manufactured and tested the entire inductor series that includes HCMA0503, HCMA0703, HCMA1104, HCMA1305, and HCMA1707 to ensure compliance with AEC-Q200 Grade 3 standard. The AEC Component Technical Committee’s definition of common electrical qualifications in automotive environments requires inductors to operate reliably in temperatures ranging from minus 40 degrees to 85 degrees (C).

AEC-Q200 testing stresses devices beyond typical commercial reliability tests for temperature cycling duration and thermal shock. This reliability is required for DC-to-DC converters, voltage regulation modules, battery powered systems, multi-phase regulators and point-of-load modules used in vehicle electronic systems.

Each inductor in the series is made of powder iron core material, and is magnetically shielded for low EMI. The HCMA0503 has a frequency range up to 1 MHz and the HCMA0703, HCMA1104, HCMA1305 and HCMA1707 operate up to 5 MHz. Each component also features high current carrying capacity and low core losses.

The HCMA Series is provided in surface mount packaging with a range of compact heights from 3 mm to 7 mm, in inductance values from 0.10 µH to 68.0 µH. Current ranges for the series start at 1.8A and extend up to 118A.

The Coiltronics Automotive Products design kit offers samples of all Eaton’s AEC-Q200-tested inductors including all the inductors in the HCMA series. Designers can order the kit free-of-charge by going to and by entering part number DK01-19360-R.

Individual samples of the HCMA are also available at

free of charge. The HCMA Series can be purchased from Mouser or DigiKey at prices starting at $1.31 (1,000).