The 74HC4066, 74HCT4066 is a quad single pole, single throw analog switch. Each switch features two input/output terminals (nY and nZ) and an active HIGH enable input (nE). When nE is LOW, the analog switch is turned off. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.

Reduced signal attenuation results in low switching losses
Reduced total harmonic distortion for high quality audio switching
Enable multiplexing of analog sensor signals - reduce number of ADC
Integrated level shifting of control signals interface to lower voltage controllers
Low ON resistance and ON resistance flatness
Low switch leakage
Wide supply voltage
Low input threshold input options
Over-voltage tolerant options
High ESD protection
Key applications
Audio/video source selection
Analog sensor multiplexing
GPIO expansion
Bus Isolation