This part is a kind of semiconductor called C4423.

Function of this product has 2SC4423.

Manufacturers : Sanyo Semiconductor Corporation

Image and pinout :

Some of the text within the PDF file :

Ordering number:EN2854 NPN Triple Diffused Planar Silicon Transistor 2SC4423 400V/12A Switching Regulator Applications Features · High breakdown voltage, high reliability. · Fast switching speed (tf : 0.1µs typ). · Wide ASO. · Adoption of MBIT process. · Micaless package facilitating easy mounting. Package Dimensions unit:mm 2039D [2SC4423] 3.4 16.0 5.0 8.0 5.6 3.1 21.0 22.0 4.0 2.8 2.0 20.4 1.0 2.0 0.6 1 2 3 3.5 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 IB PC Tc=25˚C PW≤300µs, duty cycle≤10% 5.45 [ ... ]

C4423 PDF Datasheet Download