Popular transistors.

BC558 transistor.
Pinout. Datasheet.

Type Designator: BC558.
Package: TO-92, 1-collector, 2-base, 3-emitter.
Material of transistor: Si
Polarity: PNP
Total Devise power dissipation |PD|: 0.5W
Collector-base breakdown voltage |VCBO|: 30V
Collector-emitter breakdown voltage |VCEO|: 30V
Emitter-base breakdown voltage |VEBO|: 6V
Maximum collector current |Ic max|: 0.1A
Maximum junction temperature |Tj|: +150 C
Transition frequency (ft) : 100MHz(min)
Output Capacitance |Cob|:6pF
Collector-emitter saturation voltage|VCE|:0,3V(IC=10mA,IB=0,5mA),
0,65V(IC=100mA,IB=5mA).
Base-emitter saturation voltage|VBE|:0,75V(IC=10mA,IB=0,5mA),
0,93V(IC=100mA,IB=5mA).
Forward current transfer ratio |hFE| : 125-800,(IC=2mA,VCE=5V), 125-250(BC548A), 220-475(BC548B), 420-800(BC548C).
Noise Figure, (NF): 2-10dB