Popular transistors.

2N4401 transistor.
Pinout. Datasheet.

Type Designator: 2N4401.
Package: TO-92, 1-emitter, 2-base, 3-collector.
Material of transistor: Si
Polarity: NPN
Total Devise power dissipation |PD|: 0.63 W(at ambient temperature ≤ + 25 )
Collector-base breakdown voltage |VCBO|: 60V
Collector-emitter breakdown voltage |VCEO|: 40V
Emitter-base breakdown voltage |VEBO|: 6V
Maximum collector current |Ic max|: 0.6A
Maximum junction temperature |Tj|: +150 C
Transition frequency (ft) : 250MHz
Emitter-Base Capacitance |Ceb|:30pF
Collector-Base Capacitance |Ccb|:6,5pF
Collector-emitter saturation voltage|VCE|:0,4V(IC=150mA,IB=15mA),
0,75V(IC=500mA,IB=50mA)
Base-emitter saturation voltage|VBE|:0,95V(IC=150mA,IB=15mA),
1,2V(IC=500mA,IB=50mA)
Forward current transfer ratio |hFE| : 100-300(IC=150mA)
Turn-on time|ton|:35ns
Turn-off time |toff |:250ns
Noise Figure, (NF): 4dB