TS3A24159: Is the very high current consumption normal???

When the control input voltage is too low, then current can indeed increase; see [FAQ] How does a slow or floating input affect a CMOS device?

But this should not happen for an input that is designed for 1.8 V, and where you are above V_IH.

Hi Mark,

Like Clemens said seeing a high supply current with this device when supply is 3.3V and Control logic high input signal is 1.8V is possible

 [FAQ] What is shoot-through current in an analog multiplexer and how to avoid it 

This Faq explains this in more detail.( But supply current increase is normal in with multiplexers when the control signal voltage is between the rails)

Have you seen this same supply current increase on other units of this device and is the supply current increase a significant issue in your application.

Or is using this device at 1.8V VDD a adequate solution to avoid the  supply current increase?

Regards,

Kameron