Popular transistors.

BC184L transistor.
Pinout. Datasheet.

Type Designator: BC184L.
Package: TO-92B, 1-emitter, 2-collector, 3-base.
Material of transistor: Si
Polarity: NPN
Total Devise power dissipation |PD|: 0.35 W(at ambient temperature + 25 )
Collector-base breakdown voltage |VCBO|: 45V
Collector-emitter breakdown voltage |VCEO|: 30V
Emitter-base breakdown voltage |VEBO|: 5V
Maximum collector current |Ic max|: 0.5A
Maximum junction temperature |Tj|: +150 C
Transition frequency (ft) : 150MHz(min.),240MHz(typ.)
Collector-Base Capacitance|Ccbo|:5pF(max.)
Collector-emitter saturation voltage|VCE|:0,6V(IC=10 mA,IB= 0,5mA)
Base-emitter saturation voltage|VBE|:1,2V(IC=100mA,IB= 5mA)
Forward current transfer ratio |hFE| : 450-900(IC=2mA,VCE=5V).
Noise Figure, (NF): 4dB(max.)