This part is a kind of semiconductor called P123.

Function of this product has PASSIVATED ASSEMBLED CIRCUIT ELEMENTS.

Manufacturers : International Rectifier

Image and pinout :

Some of the text within the PDF file :

Bulletin I27125 rev. A 04/99 P100 SERIES PASSIVATED ASSEMBLED CIRCUIT ELEMENTS Features Glass passivated junctions for greater reliability Electrically isolated base plate Available up to 1200 V RRM, V DRM High dynamic characteristics Wide choice of circuit configurations Simplified mechanical design and assembly UL E78996 approved 25A Description The P100 series of Integrated Power Circuits consists of power thyristors and power diodes configured in a single package. With its isolating base plate, mechanical designs are greatly simplified giving advantages of cost reduction and reduced size. Applications include power supplies, control circuits and battery chargers. Major Ratings and Characteristics Parameters ID @ TC IFSM @ 50Hz @ 60Hz It 2 P100 25 85 357 375 637 580 6365 400 to 1 [ ... ]

P123 PDF Datasheet Download