TMUX611x Quad SPST Switches Texas Instruments TMUX611x Quad SPST Switches are modern complementary metal-oxide semiconductor (CMOS) devices that have four independently selectable single-pole/single-throw (SPST) switches. The devices work well with dual supplies (±5V to ±16.5V), a single supply (10V to 16.5V), or asymmetric supplies. All digital inputs have transistor-transistor logic (TTL) compatible thresholds, ensuring TTL/CMOS logic compatibility.