TMUX111x SPST 4-Channel Precision Switches Texas Instruments TMUX111x SPST 4-Channel Precision Switches are precision complementary metal-oxide semiconductor (CMOS) devices with four independently selectable 1:1, single-pole, single-throw (SPST) switches. A wide operating supply of 1.08V to 5.5V allows for use in a broad array of applications, from medical equipment to industrial systems. The device supports bidirectional analog and digital signals on the source (Sx) and drain (Dx) pins ranging from GND to VDD.