The BC856 3B is a transistors are designed for general purpose amplifier applications. They are housed in the SC−70/SOT−323 which is designed for low power surface mount applications.
The 2N5400 and 2N5401 are silicon PNP transistors designed for high voltage amplifier applications. Bipolar (BJT) Transistor PNP 150V 600mA 300MHz 350mW Surface Mount SOT-23.
The CD4066BM is a quad bilateral switch intended for the transmission or multiplexing of analog or digital signals. It is pin-for-pin compatible with the CD4016B device, but exhibits a much lower on-state resistance.