The TIP122 is very popular Darlington pair NPN power transistor. It is rated at 100V 5Amp. It has gain over 1000 and has typical power dissipation of 50W.
The TIP127 is very popular Darlington pair PNP power transistor. It is rated at 100V 5Amp. It has gain over 1000 and has typical power dissipation of 50W.
The BD681 transistor is plastic, medium-power silicon NPN Darlingtontransistors can be used as output devices in complementary general-purpose amplifier applications.