Yes 3.5kV is correct for the ADG5248F.
Apologies for the delayed response on this.
There is no dedicated ESD Protection on these devices. They have been tested and can withstand +/-300 V HBM ESD.
We have recently released a family of new over-voltage protection switches and multiplexers…
Q1. What are the key benefits of these fault protected switches?
A1. There are a number of key features on these parts