This part is a kind of semiconductor called 2SC4728.

Function of this product has 50V/5A Switching Applications.

Manufacturers : Sanyo Semicon Device

Image and pinout :

Some of the text within the PDF file :

Ordering number:EN3872 PNP/NPN Epitaxial Planar Silicon Transistors 2SA1824/2SC4728 50V/5A Switching Applications Applications · Relay drivers, high-speed inverters, converters, and other general high-current switching applications. Package Dimensions unit:mm 2084 [2SA1824/2SC4728] Features · Low collector-to-emitter saturation voltage. · High Gain-Bandwidth Product. · Excellent linearity of DC Current Gain. · Fast switching speed. ( ) : 2SA1824 E : Emitter C : Collector B : Base SANYO : FLP Specifications Absolute Maximum Ratings at Ta = 25˚C Parameter Collector-to-Base Voltage Collector-to-Emitter Voltage Emitter-to-Base Voltage Collector Current Collector Current (Pulse) Base Current Collector Dissipation Junction Temperature Storage Temperature Symbol VCBO VCEO VEBO IC ICP [ ... ]

2SC4728 PDF Datasheet Download