The TMUX7462F conducts equally well from source (Sx) to drain (Dx) or from drain (Dx) to source (Sx). Each signal path has very similar characteristics in both directions; however, it is noted that the overvoltage protection is implemented only on the source (Sx) side. The voltage on the drain is only allowed to swing between V_FP and V_FN and no overvoltage protection is available on the drain side.

The primary supplies (V_DD and V_SS) define the on-resistance profile of the switch channel, whereas the fault voltage supplies (V_FP and V_FN) define the signal range that can be passed through from source to drain of the device. It is good practice to use voltages on V_FP and V_FN that are lower than V_DD and V_SS to take advantage of the flat on-resistance region of the device for better input-to-output linearity. The flattest on-resistance region extends from V_SS to roughly 3 V below V_DD. Once the signal is within 3 V of V_DD the on-resistance will exponentially increase and may impact desired signal transmission.