maybe used in satellite if weight and capacity are not the constrain factors. It is possible to use common chips, which is cheaper, and easier to mount on the board. The only thing is that temperature regulator is needed. That takes space, weight, and energy which are the primary factors of consideration for payload design. Heavier the SV is, more fuel is required, and may end up in lower orbit. The SV size is fixed, and there isn't a lot of room to change. Energy, the SV requires energy which is not easy to obtain. Therefore, many SVs use special designed chips to do the job.

Radiation is not really a concern, since most of the SVs are quite well shielded from radiation anyway.