This part is a kind of semiconductor called 2SC5172.

Function of this product has NPN TRIPLE DIFFUSED TYPE (SWITCHING REGULATOR AND HIGH VOLTAGE SWITCHING/ HIGH SPEED DC-DC CONVERTER APPLICATIONS).

Manufacturers : Toshiba Semiconductor

Image and pinout :

Some of the text within the PDF file :

2SC5172 TOSHIBA Transistor Silicon NPN Triple Diffused Type (PCT process) 2SC5172 Switching Regulator and High-Voltage Switching Applications High-Speed DC-DC Converter Applications Unit: mm • • Excellent switching times: tr = 0.5 µs (max), tf = 0.3 µs (max) at IC = 2 A High collector breakdown voltage: VCEO = 400 V Maximum Ratings (Tc = 25°C) Characteristics Sy Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Base current Collector power dissipation Junction temperature Storage temperature range Ta = 25°C Tc = 25°C DC I Pulse I mbol VCBO VCEO VEBO C CP 7 Rating 600 400 7 5 Unit V V V A IB PC Tj Tstg 2A 2.0 25 150 −55 to 150 W °C °C JEDEC JEITA TOSHIBA 2 Weight: 1.7 g (typ.) ― SC-67 -10R1A Electrical Characteristics (Tc = 25 [ ... ]

2SC5172 PDF Datasheet Download