TMUX1574 2:1 SPDT 4-Channel Switch Texas Instruments TMUX1574 2:1 SPDT 4-Channel Switch has a wide operating supply of 1.5V to 5.5V and allows for use in various applications. These applications range from servers and communication equipment to industrial applications. The device supports bidirectional analog and digital signals on the source (SxA, SxB) and drain (Dx) pins and can pass signals above supply up to VDD x 2, with a maximum input/output voltage of 5.5V.