This part is a kind of semiconductor called BUX48.

Function of this product has High voltage fast-switching NPN power transistors.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

BUX48 BUX48A High voltage fast-switching NPN power transistors Features ■ NPN transistors ■ High voltage capability ■ High current capability )■ Fast switching speed uct(sApplications rod■ Switching mode power supplies ■ Flyback and forward single transistor low power Pconverters leteDescription bsoThe BUX48 and BUX48A are multi epitaxial mesa ONPN transistors mounted in TO-3 metal can. -They are intended for switching and industrial Obsolete Product(s)applications for single and three-phase mains. 1 2 TO-3 Figure 1. Internal schematic diagram Table 1. Device summary Order code Marking Package Packaging BUX48 BUX48A BUX48 BUX48A TO-3 TO-3 tray November 2007 Rev 1 1/9 www.st.com 9 Absolute maximum ratings 1 Absolute maximum ratings BUX48 BUX48A Table 2. Abso [ ... ]

BUX48 PDF Datasheet Download