This part is a kind of semiconductor called BC517.

Function of this product has NPN Silicon Darlington Transistor (High current gain High collector current).

Manufacturers : Siemens Semiconductor Group

Image and pinout :

Some of the text within the PDF file :

NPN Silicon Darlington Transistor q High current gain q High collector current q Complementary type: BC 516 (PNP) BC 517 BC 517 2 3 11 Type BC 517 Marking – Ordering Code Q62702-C825 Pin Configuration 123 CBE Package1) TO-92 Maximum Ratings Parameter Collector-emitter voltage Collector-base voltage Emitter-base voltage Collector current Peak collector current Base current Peak base current Total power dissipation, TC = 66 ˚C Junction temperature Storage temperature range Thermal Resistance Junction - ambient Junction - case2) Symbol VCE0 VCB0 VEB0 IC ICM IB IBM Ptot Tj Tstg Values Unit 30 V 40 10 500 mA 800 100 200 625 mW 150 ˚C – 65 … + 150 Rth JA Rth JC ≤ 200 ≤ 135 K/W 1) For detailed information see chapter Package Outlines. 2) Mounted on Al heat sink [ ... ]

BC517 PDF Datasheet Download