This part is a kind of semiconductor called 2N3903.

Function of this product has General Purpose Transistors(NPN Silicon).

Manufacturers : ON Semiconductor

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Some of the text within the PDF file :

2N3903, 2N3904 General Purpose Transistors NPN Silicon Features • Pb−Free Packages are Available* MAXIMUM RATINGS Rating Symbol Value Unit Collector −Emitter Voltage Collector −Base Voltage Emitter −Base Voltage Collector Current − Continuous Total Device Dissipation @ TA = 25°C Derate above 25°C VCEO VCBO VEBO IC PD 40 Vdc 60 Vdc 6.0 Vdc 200 mAdc 625 mW 5.0 mW/°C Total Device Dissipation @ TC = 25°C Derate above 25°C PD 1.5 W 12 mW/°C Operating and Storage Junction Temperature Range TJ, Tstg −55 to +150 °C THERMAL CHARACTERISTICS (Note 1) Characteristic Symbol Max Unit Thermal Resistance, Junction−to−Ambient RqJA 200 °C/W Thermal Resistance, Junction−to−Case RqJC 83.3 °C/W Stresses exceeding Maximum Ratings may damage the device. Maxim [ ... ]

2N3903 PDF Datasheet Download