TSMC Arizona Packaging

Chip packaging is the step that turns several pieces of silicon into one working processor, wiring compute chips and memory together on a single base. Taiwan Semiconductor Manufacturing Co. said on April 22 it plans to open an advanced packaging plant in Arizona by 2029. (thestar.com.my) TSMC executive Kevin Zhang told Reuters the Arizona site would package chips made for artificial intelligence systems, which now combine multiple dies instead of one monolithic chip. Reuters reported packaging has become a bottleneck for Nvidia and other AI chip designers. (money.usnews.com) The company’s main packaging method here is CoWoS, short for chip-on-wafer-on-substrate, which places several chips on an interposer and then onto a substrate so they can act like one larger processor. TSMC says CoWoS is used for artificial intelligence and supercomputing workloads that need very high bandwidth between chips. (tsmc.com) TSMC said this week it is already producing 5.5-reticle-size CoWoS packages and plans a 14-reticle version in 2028. Electronics Weekly reported that package size would be large enough to connect about 10 large compute dies and 20 high-bandwidth memory stacks. (electronicsweekly.com) That detail changes where the constraint sits in the AI chip supply chain. The hard part is no longer only etching smaller transistors on a wafer, but also assembling far larger multi-chip systems with enough memory and interconnect to feed them. (money.usnews.com) (electronicsweekly.com) Arizona is already TSMC’s main U.S. manufacturing hub. On March 4, 2025, TSMC said it would add $100 billion to its U.S. investment, bringing the total to $165 billion for six fabs, two advanced packaging facilities, and a research and development center in Phoenix. (pr.tsmc.com) TSMC’s Arizona site has already moved from plan to production on the wafer side. The company says high-volume production on its 4-nanometer process started in the first Arizona fab in the fourth quarter of 2024, with a second fab targeting volume production on 3-nanometer technology in the second half of 2027. (tsmc.com) For now, that means the United States is getting more of the chip stack in one place: wafer fabrication first, then packaging a few years later. If TSMC hits the 2029 target, Arizona would handle more of the work needed to turn AI silicon into finished systems instead of sending more of that final assembly back across the Pacific. (tsmc.com) (thestar.com.my)