I did a little research and found this on UMC's website:

300-mm Production Leadership

UMC consistently provides its customers with leading-edge technologies earlier than any other foundry, and this commitment applies to manufacturing technology as well. UMC's aggressive transition to 300-mm wafers enables its customers to realize reduced costs and maintain competitive advantages to stay ahead of the competition. UMC's Fab 12A in Tainan is in volume production for customer products with yields (DD) equal to or greater than 200mm equivalents. UMCi, UMC's joint venture 300mm fab with Infineon, in Singapore is scheduled for pilot production in the second quarter of 2003.

http://www.umc.com/english/about/q.asp



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