TSMC Arizona Fab Produces First 4nm Chips — Reshoring Milestone as Apple and AMD Confirmed as Initial Customers

TSMC's Arizona fabrication facility has achieved a landmark milestone by producing its first 4nm chips on American soil, marking the most advanced semiconductor node ever manufactured in the United States. Apple and AMD have been confirmed as the initial customers for the fab's N4P process output, with Apple expected to use the chips in future iPhone and Mac products while AMD targets its next-generation EPYC server processors. The Arizona fab, located in north Phoenix, employs over 2,200 engineers and technicians, a mix of TSMC veterans relocated from Taiwan and locally hired American workers trained through an intensive 18-month program developed in partnership with Arizona State University.

Yield rates at the Arizona facility are approaching 90%, significantly ahead of the company's internal schedule and narrowing the gap with TSMC's mature Taiwan fabs faster than analysts anticipated. TSMC chairman Mark Liu stated that the Arizona facility's yield performance "exceeded our most optimistic projections" and credited the success to a hybrid management approach that combines Taiwanese process expertise with American engineering talent. The fab is currently running at approximately 20,000 wafers per month, with plans to scale to 50,000 wafers per month by year-end as additional equipment is installed and qualified.

The success has accelerated plans for a 3nm expansion at the same site, with the administration approving $6.6 billion in CHIPS Act funding to support the next phase of construction. A third fab on the Arizona campus, targeting TSMC's 2nm N2 technology, has also been greenlit for construction starting in late 2026, with production expected in 2029. The total TSMC investment in Arizona is projected to exceed $65 billion, making it one of the largest foreign direct investments in U.S. history. The milestone represents a pivotal moment for the U.S. semiconductor reshoring effort, demonstrating that cutting-edge chip manufacturing can be successfully established outside of East Asia — a proposition that many industry skeptics had questioned given the challenges of replicating Taiwan's semiconductor ecosystem in a new geography.