This part is a kind of semiconductor called C3405.

Function of this product has 2SC3405.

Manufacturers : Toshiba

Image and pinout :

Some of the text within the PDF file :

TOSHIBA Transistor Silicon NPN Triple Diffused Type 2SC3405 2SC3405 Switching Regulator and High Voltage Switching Applications High Speed DC-DC Converter Applications Industrial Applications Unit: mm • Excellent switching times: tr = 1.0 μs (max) tf = 1.0 μs (max), (IC = 0.3 A) • High collector breakdown voltage: VCEO = 800 V Absolute Maximum Ratings (Ta = 25°C) Characteristics Symbol Rating Unit Collector-base voltage VCBO 900 V Collector-emitter voltage VCEO 800 V Emitter-base voltage VEBO 8 V Collector current DC Pulse IC 0.8 A ICP 1.5 Base current IB 0.2 A Collector power dissipation Ta = 25°C Tc = 25°C PC 1.0 W 20 JEDEC JEITA ― ― Junction temperature Storage temperature range Tj 150 °C Tstg −55 to 150 °C TOSHIBA 2-7J1A Weight: 0.36 [ ... ]

C3405 PDF Datasheet Download