Taiwan Semiconductor Manufacturing Co has begun producing advanced four-nanometer chips for U.S. customers in Arizona, Commerce Secretary Gina Raimondo told Reuters, a milestone in the Biden administration's semiconductor efforts.

TSMC's Arizona plant has apparently started making Apple Watch chips. Here's everything we know about Apple US production.

TSMC Arizona has just picked up its second contract from Apple: fab will make SiPs (Systems-in-Package) for Apple Watch, as well as A16 chips for iPhones.

Moreover, AMD Ryzen 9000 CPUs are chiplet designs. While it seems AMD is now having some 8-core CPU dies made in Arizona, the package also contain a 6nm I/O die housing the memory controller and other functionality.

TSMC's chip foundry in Arizona is not just making one Apple chip, as a second Apple design is reportedly now in production at the facility.

TSMC agreed to expand its planned investment by US$25 billion to US$65 billion and to add a third Arizona fab by 2030.

The bulk of TSMC’s production remains in Taiwan, but its efforts to build foundries abroad—notably Germany and the U.S.—seem to be attracting big-name chip customers. (The Germany fab is expected to come online by 2027.