Popular transistors.

BC558 transistor.
Pinout. Datasheet.

Marking: BC558.
Package: TO-92, 1-collector, 2-base, 3-emitter.
Material of transistor: Si
Polarity: PNP
Total Devise power dissipation |PD|: 0.5 W(at ambient temperature ≤ + 25 °)
Collector-base breakdown voltage |VCBO|: 30V
Collector-emitter breakdown voltage |VCEO|: 30V
Emitter-base breakdown voltage |VEBO|: 5V
Maximum collector current |Ic max|: 0.1A
Maximum junction temperature |Tj|: +150 °C
Transition frequency (ft) : 150MHz(typ.)
Output Capacitance |Cob|:6pF
Collector-emitter saturation voltage|VCE|:0,08V(IC=10mA,IB=0,5mA),
0,25V(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(BC558A), 220-475(BC558B), 420-800(BC558C).
Noise Figure, (NF): 2-10dB