Popular transistors.

BC847A transistor.
Pinout. Datasheet.

Type Designator: 1E,or 1E with an additional small letter denoting the manufacturer.For example - 1Ep(made in Hong Kong), 1Et(made in Malaysia),1EW(made in China).
Package: SOT-23, 1-collector, 2-emitter, 3-base.
Material of transistor: Si
Polarity: NPN
Total Devise power dissipation |PD|: 0.250 W(at ambient temperature ≤ + 25 )
Collector-base breakdown voltage |VCBO|: 50V
Collector-emitter breakdown voltage |VCEO|: 45V
Emitter-base breakdown voltage |VEBO|: 6V
Maximum collector current |Ic max|: 0.1A
Maximum junction temperature |Tj|: +150 C
Transition frequency (ft) : 100MHz(min)
Collector-outpute Capacitance|Cob|:1,5pF
Collector-emitter saturation voltage|VCE|:200mV(IC=100mA,IB= 5mA)
Base-emitter saturation voltage|VBE|:900mV(IC=100mA,IB=5mA)
Forward current transfer ratio |hFE| : 100-800,(IC= 2mA,VCE=5V),