Popular transistors.

2N2907A transistor.
Pinout. Datasheet.

Type Designator: 2N2907A.
Package: TO-18, 1-emitter, 2-base, 3-collector.
Material of transistor: Si
Polarity:PNP
Total Devise power dissipation |PD|: 0,4W(at ambient temperature ≤ + 25 )
Collector-base breakdown voltage |VCBO|: 60V
Collector-emitter breakdown voltage |VCEO|: 60V
Emitter-base breakdown voltage |VEBO|: 5V
Maximum collector current-continuous |Ic max|: 0,6A
Maximum junction temperature |Tj|: 200 C
Transition frequency (ft) : 200MHz(min.)
Emitter Capacitance |Ce|:30pF
Collector Capacitance |Cc|:8pF
Collector-emitter saturation voltage|VCE|:0,4V(IC=150mA,IB=15mA),
1,6V(IC=500mA,IB=50mA)
Base-emitter saturation voltage|VBE|:1,3V(IC=150mA,IB=15mA),
2,6V(IC=500mA,IB=50mA)
Forward current transfer ratio |hFE| : 100-300(IC=150mA,VCE=10V)
Turn-on time|t on |:45ns
Turn-off time|t off |:300ns