Thank you for your reply. Sigh. It's a mine field actually. Yes, I did notice that trying to find comparable products from the same mfg is akin to pulling teeth. Just when It looks like I may have found a good replacement, there is always one thing about it that breaks the euphoria. Voltage too low, or way way too much R(on) resistance compared to the original, et al.
I am to the point where I am thinking that it is just less painful to wack in my own level shifting, this component equiv search is proving itself as being exceedingly annoying, exceedingly time consuming and exceedingly unproductive. Thank you for your search query suggestion, I will definitely try that.
The DG303 is a rather expensive component (I use two of them) and the more I think about it, the more compelled I am to just do my own level shifting to make the existing chips happy. This has become so annoying that I am almost to the point of just dead bugging some switching transistors onto them, cutting some traces and just be done with it already. But to bodge such a beautiful laid out pcb that I spent a significant amount of time designing and am proud of seems to be such a shame.
So the search continues at least until I can't take it anymore. Just 4 sot-23's and a few resistors, but even laying out a new pcb with those still feels like a bodge to me.
Cheers,
Nikki