This part is a kind of semiconductor called C3040.

Function of this product has 2SC3040.

Manufacturers : Sanyo

Image and pinout :

Some of the text within the PDF file :

Ordering number:EN997B NPN Triple Diffused Planar Silicon Transistor 2SC3040 400V/8A Switching Regulator Applications Features · High breakdown voltage (VCBO≥500V). · Fast switching speed. · Wide ASO. Package Dimensions unit:mm 2022A [2SC3040] Specifications 1 : Base 2 : Collector 3 : Emitter SANYO : TO-3PB Absolute Maximum Ratings at Ta = 25˚C Parameter Symbol Conditions Ratings Collector-to-Base Voltage Collector-to-Emitter Voltage Emitter-to-Base Voltage Collector Current Collector Current (Pulse) Base Current Collector Dissipation VCBO VCEO VEBO IC ICP IB PC PW≤300µs, Duty Cycle≤10% Tc=25˚C 500 400 7 8 16 3 2.5 80 Junction Temperature Tj 150 Storage Temperature Tstg –55 to +150 Electrical Characteristics at Ta = 25˚C Parameter Symbol Conditions R [ ... ]

C3040 PDF Datasheet Download