I would recommend either the ADG712 or the ADG812 as an alternative to the FST3125MX. They are both 4 x SPST switches with the ADG812 having the lowest Ron and the ADG712 with a larger signal bandwidth.
We want to use these part in a deign with a single 3V3 rail. I cannot find any tolerance on the minimum voltage given in the datasheet which is 3V3. Bearing in mind tolerance on the supply this would mean our supply could be slightly
In the Absolute Maximum Ratings (Table 3) of the data sheet, it shows that the maximum continuous current that S or D can handle is 30mA at 25C. At 70C, the maximum continuous current would be less again.