This part is a kind of semiconductor called YG901C2.

Function of this product has LOW LOSS SUPER HIGH SPEED RECTIRIER.

Manufacturers : Fuji Electric

Image and pinout :

Some of the text within the PDF file :

For more information, contact: Collmer Semiconductor, Inc. P.O. Box 702708 Dallas, TX 75370 972-733-1700 972-381-9991 Fax http://www.collmer.com [ ... ]

YG901C2 PDF Datasheet Download