Quad Bilateral Switch - CD4066
CMOS Quad Bilateral Switch
The CD4066 device 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. In addition, the on-state resistance is relatively constant over the full signal-input range.
Description above from Texas Instruments, see product information for more details - http://www.ti.com/product/CD4066B