PA? https://en.wikipedia.org/wiki/P.A._Semi ?
What is it that Fairchild and "PA" did that makes them foundational?
Does ON Semi have fabs in the US?
Yes, but no idea how important the US fabs are. They have more fabs in China, India, Japan, Europe...[1]
ON Semi is the successor of Motorola's semiconductor business.
What PA and Fairchild did. We haven’t had a new-entrant opening for fundamental semiconductor design for decades, a fact laid bare in their top engineers’ comp. (No clue if this is what they are actually doing.)