harleydk:
Riddle me this, is the pitch-sizes fixed for the various package types?
The answer to this is no. There are some really common types and then a whole bunch of less common types and while I would call a lot of them common (e.g. 100-TQFP 0.5mm is very much the same over many manufacturers) I wouldn't call any standard. This is very different than the DIP days because with surface mount you don't use standard sockets, you are pretty much forced to make a PCB which means the manufacturers can say "do it our way because you have to get a PCB anyway and your PCB software has the flexibility to handle it." So there are some really weird things out there. I found these in my software:
But beyond that, there are various pin pitch sizes even within one type of package as you found out.
