The CD4066BD part is a quad bilateral switch, which is a CMOS device manufactured by Texas Instruments. The switch is designed to be used when multiple analog signals need to be connected and disconnected in a circuit. It features two independent controlled electronic switches in the form of N-Channel MOSFETs. Each switch can be independently controlled by taking a logic high (5V) or logic low (0V) on the device’s input, which will open or close the respective switch. The switch can be used for many applications, such as analog multiplexers, change-over switches, logic gating, and level shifters. The device offers low power consumption, excellent ON/OFF channel leakage, and provides low noise up to 10MHz bandwidth.