The CD4066 is a CMOS logic-based Quad Bilateral Switch IC belonging to a CD4000 family of integrated circuits. It has four analog/digital switches that can conduct in both directions. They have independent control inputs. 

Technical Specification:

• Operating Voltage: 3V to 18V
• Switching Voltage (max): 20V 
• On-state Resistance: 5Ω (at 15V Vcc and 10kΩ Load)
• Output current High: -0.4mA
• Low Level Control pin Voltage(max): 0.9V
• High Level Control pin Voltage: 11V (min @ 15V Vcc)

Features:

• High Linearity
• Very low off-state switch leakage
• Very high control i/p impedance
• Crosstalk is less in between four switches

Applications:

• 4-Input Multiplexer
• Sample and Hold circuits
• Network switching
• Dead band filter