BC547 Transistor Explained / Description:
BC547 is a general-purpose BJT NPN transistor mostly used in electronics hobbyists and educational electronics projects. Besides these uses, it can also be used in commercial circuits. It comes in TO-92 packaging and the maximum output current this transistor can handle is 100mA. The transistor is having very good DC current gain and low noise capabilities due to which is ideal to use in signal amplification stages. The typical saturation voltage is only 90 millivolts which is also a good sign to use it as a switch
 
Features / technical specifications:
Package Type: TO-92
Transistor Type: NPN
Max Collector Current(IC): 100mA
Max Collector-Emitter Voltage (VCE): 45V
Max Collector-Base Voltage (VCB): 50V
Max Emitter-Base Voltage (VEBO): 6V
Max Collector Dissipation (Pc): 500 miliWatt
Max Transition Frequency (fT): 300 MHz
Minimum & Maximum DC Current Gain (hFE): 110 – 800
Max Storage & Operating temperature Should Be: -65 to +150 Centigrade
 
Applications:
Sensor Circuits
Audio Preamp circuits
Audio Amplifier Stages
Switching Loads under 100mA
Transistor Darlington Pairs
Radio Frequency Circuits