Complementary transistor output stage. 3.3.

The complementary transistors are small signal types; Others, like the BC547/BC557, can be used as well.

The complementary transistors TR1 and TR2 operate in the emitter follower mode.

Alternatively, inverters can be constructed using two complementary transistors in a CMOS configuration.

It used CTuL (Complementary Transistor MicroLogic) in integrated circuits from Fairchild Semiconductor.