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Diodes, transistors claim smallest SMP sol'n

Posted: 11 Oct 2011     Print Version  Bookmark and Share

Keywords:power transistor  diode  surface mount packaging 

Microsemi Corp. launches what is claimed as the industry's smallest hermetic surface mount U4 package for power transistors and diodes. The U4 package is said to have achieved Defence Logistics Agency (DLA) qualification for a range of products.

The new industry-standard U4 package pioneered by Microsemi currently qualifies medium power NPN and PNP bipolar transistors. Microsemi says it will also pursue qualifications for additional device types to support customer-specific requirements.

The compact U4 is 70 per cent smaller than its U3 predecessor and available now exclusively from Microsemi. The package is constructed with aluminium nitride ceramic, which provides excellent heat dissipation. This is particularly important for small products such as power supplies, converters and regulators which operate at high current rates that can cause overheating issues.

"Microsemi created the hermetic U4 package to provide defence contractors with a rugged surface mount packaging solution for space-constrained products used in military environments," said Simon Wainwright, VP of marketing and business development for Microsemi's HiRel Group. "We have been serving the defence sector for more than 50 years, and will continue to build on our track record of innovating solutions for applications where exceptional performance and reliability are vital."

The U4 has a typical power rating of 5W-15W (@ Tc=25C) and is the smallest, hermetic surface mount package in its power category. Packaged parts are compatible with current pick-and-place assembly processes and are offered in tape-and-reel format.

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