Popular transistors.

BFS20 transistor.
Pinout. Datasheet.

Marking code: :G1,G1W,G1t,G1p
Package: SOT-23, 1-collector, 2-emitter, 3-base.
Material of transistor: Si
Polarity: NPN
Total Devise power dissipation |PD|: 0.25 Watt
Collector-base breakdown voltage |VCBO|: 30V
Collector-emitter breakdown voltage |VCEO|: 20V
Emitter-base breakdown voltage |VEBO|: 4V
Maximum collector current |Ic max|: 25mA
Maximum junction temperature |Tj|: +150 C
Transition frequency (ft) : 275-450MHz
Collector Capacitance|Cc|:1pF(max.)
Base-emitter saturation voltage|VBE|:740mV(IC=7mA,VBC=10v)
Forward current transfer ratio |hFE| : 40-85,(IC=7mA,VCE=10V),
BFS20 Datasheet (PDF)