TMUX1575 2:1 SPDT Powered-Off Protection Switch Texas Instruments TMUX1575 2:1 SPDT Powered-Off Protection Switch is a complementary metal-oxide semiconductor (CMOS) switch in a 2:1 (SPDT) configuration with 4-channels. The small size and operating supply voltage of 1.08V to 3.6V allow for use in a broad array of applications from servers and communication equipment to personal electronics applications. The device supports bidirectional analog and digital signals on the source (SxA, SxB) and drain (Dx) pins and can pass signals up to VDD x 2 with a maximum input/output voltage of 3.6V.