This part is a kind of semiconductor called 1N6642US.

Function of this product has SWITCHING DIODES.

Manufacturers : Microsemi

Image and pinout :

Some of the text within the PDF file :

1N6638US, 1N6642US, 1N6643US Available on commercial versions VOIDLESS HERMETICALLY SEALED SWITCHING DIODES Qualified per MIL-PRF-19500/578 DESCRIPTION This popular surface mount equivalent JEDEC registered switching/signal diodes are military qualified and available with internal metallurgical bonded construction. These small low capacitance diodes with very fast switching speeds are hermetically sealed and bonded into a “D-5B” package. They may be used in a variety of fast switching applications including computers and peripheral equipment such as magnetic cores, thin-film memories, plated-wire memories, as well as decoding or encoding applications, etc. Microsemi also offers a variety of other switching/signal diodes. Important: For the latest information, visit our website http [ ... ]

1N6642US PDF Datasheet Download