This part is a kind of semiconductor called BD243C.

Function of this product has Complementary power transistors.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

BD243C BD244C Complementary power transistors Features ■ Complementary NPN-PNP devices Applications ■ Power linear and switching Description The device is manufactured in Planar technology with “Base Island” layout. The resulting transistor shows exceptional high gain performance coupled with very low saturation voltage. The PNP type is BD244C. . 3 2 1 TO-220 Figure 1. Internal schematic diagram Table 1. Device summary Order code BD243C BD244C Marking BD243C BD244C Package TO-220 Packaging Tube July 2007 Rev 5 1/10 www.st.com 10 Absolute maximum ratings 1 Absolute maximum ratings BD243C BD244C Note: Table 2. Symbol Absolute maximum ratings Parameter VCBO VCEO VEBO IC ICM IB PTOT Tstg TJ Collector-base voltage (IE = 0) Collector-emitter voltage (IB = 0) Emitte-base [ ... ]

BD243C PDF Datasheet Download