This part is a kind of semiconductor called US30KB80R.

Function of this product has Silicon Bridge Diodes.

Manufacturers : Shindengen

Image and pinout :

Some of the text within the PDF file :

CAT.No.TJ 536 SILICON BRIDGE DIODES USKB SERIES Summary Bridge diodes are being required to take up less space accompanying the reduced size of electronic equipment. In order to respond to these needs, Shindengen has developed a new package in offering a complete lineup of bridge diodes that can be used in a wide range of power supply environments. Features Rectified forward current : 4A US4KB80R , 6A US6KB80R , 8A US8KB80R , with heat sink 10A US10KB80R , 15A US15KB80R , 30A US30KB80R Large current capacity of 30A with compact package High IFSM and High Voltage UL approved Bridge Rectifier Diodes, registered in file number E142422 High-density mounting for improved space efficiency through the use of SIP Single In-Line Package Application TV, Monitor, Switching power supply, PC, Aud [ ... ]

US30KB80R PDF Datasheet Download