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By Sarah Wu

TAIPEI (Reuters) -Taiwanese chipmaker TSMC is planning to produce chips with advanced 3-nanometre technology at its new factory in the U.S. state of Arizona but the plans are not co*pletely finalised yet, the co*pany’s founder Morris Chang said on Monday.

Taiwan Semiconductor Manufacturing Co Ltd (TSMC), a major Apple Inc supplier and the world’s largest contract chipmaker, is constructing a $12 billion plant in Arizona.

Last year, Reuters reported TSMC’s plans to build more chipmaking factories in Arizona, including discussions about whether its next plant should be more advanced which could make chips with 3-nanometer technology co*pared to the slower, less-efficient 5-nanometer chips that will be churned out when the facility begins production.

Chang, speaking to reporters in Taipei after returning from the APEC summit in Thailand, said the 3-nanometre plant would be located at the same Arizona site as the 5-nanometre plant.

“Three-nanometre, TSMC right now has a plan, but it has not been co*pletely finalised,” said Chang, who has retired from TSMC but remains influential in the co*pany and the broader chip industry.

“It has almost been finalised – in the same Arizona site, phase two. Five-nanometre is phase one, 3-nanometre is phase two.”

TSMC, Asia’s most valuable listed co*pany, declined to co*ment.

The co*pany is holding a “tool-in” ceremony in Arizona on Dec. 6.

Chang said he would be attending, along with TSMC customers and suppliers and U.S. co*merce Secretary Gina Raimondo.

Chang added that U.S. President Joe Biden has also been invited, but that he didn’t know if he would be going.

(Reporting by Sarah Wu and Ben Blanchard; Editing by Edmund Klamann and Muralikumar Anantharaman)