[kurthr]

You need to redesign the entire circuit. If it is completely standard digital (e.g. no RAM, no Flash, no 3V IO, no ESD structure), then you can likely port it without too much pain. However, you still have to change the entire package/bond pattern, and completely requalify the part with a customer who sees no advantage. Minimum port/design cost $1M and expect mask fees of at least $2M.

So at 30% margins on a $0.33 part, you can expect to break even 30M sales later!