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Power inductors deliver performance at elevated temps

Posted: 24 Aug 2005     Print Version  Bookmark and Share

Keywords:power inductor  inductor  bi technologies  hm70 

A new series of shielded SMT power inductors from TT electronics BI Technologies Magnetic Components Division is said to deliver stable electrical performance even at elevated temperatures. Suitable for high-temperature applications where PC-board space is at a premium, the new high current, low-profile inductors are rated for operation up to 180°C.

Designated the HM70 series, these power inductors feature typical inductance values from 0.70µH to 2.10µH (±20 percent, measured at 100kHz), with DC resistance values from 1.05 milliohms to 4.71 milliohms. The inductors are available in seven package with sizes ranging from 9-by-10.5mm to 13.5-by-12.9mm, with a board-mounted profile that ranges from 3.7-by-5.50mm.

These HM70 surface-mount devices are specified for a maximum temperature rise of 50°C with a minimal change in electrical performance, and are designed to operate under full load conditions up to 130°C without derating—a critical specification for design engineers whose circuits must perform under high temperatures, said the company. The maximum operating temperature range is -40°C to 180°C, with derating for temperatures above 130°C.

These devices may be used in under-the-hood automotive and server/router applications that must operate in high temperature environments as well as compact VRM and dc-dc converter modules.

Typical pricing for the HM70 Series is 67 cents each in quantities of 10,000.

- Gina Roos


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