The AI infrastructure story has mostly been told through the lens of advanced chips and the foundries that produce them. But there is another layer of the supply chain, often overlooked, that determines whether any of these systems actually work. Signals must be transmitted. Power must be delivered across increasingly complex architectures. And the companies solving these high-density interconnect challenges are increasingly headquartered in Taiwan.
Taiwan’s printed circuit board (PCB) manufacturers are entering an unprecedented investment cycle, reversing three consecutive years of declining capital expenditure. The catalyst is artificial intelligence. Industry leaders describe the coming period as a “golden decade” for PCBs. By 2029, according to Unimicron Chairman Tzyy-Jang Tseng, boards serving AI applications will surpass smartphone circuit boards in global market value for the first time, confirming a fundamental shift from consumer electronics toward AI infrastructure.
The numbers tell the story. Zhen Ding Technology plans to invest over US$1.58 billion in 2026, a 60% increase from 2025, building 10 new factories across Taiwan, China, and Thailand. Unimicron Technology is spending over US$790 million, more than 20% above 2025 levels, with investment concentrated on high-end ABF substrate production for advanced packaging technologies such as CoWoS and EMIB. Compeq Manufacturing has committed more than US$3.16 billion over two years, prioritizing high-end capacity for ASIC server orders.
The supporting ecosystem is scaling alongside these leaders. Allied Circuit and First Hi-tec all posted record 2025 revenues on surging AI server shipments and are rolling out new capacity for 2026. Even automotive PCB specialist Dynamic Electronics has nearly doubled its AI-focused expansion budget and expects AI-related revenue to surpass 20% of sales by late 2026. Thailand has emerged as the preferred destination for overseas plants, as Western clients push for supply chain diversification.
Manufacturing complexity has kept pace. Over the past two decades, key component sizes have grown 20 times, layer counts have quadrupled, and connection points have increased 300-fold. A single high-end AI server motherboard now requires more than 130 manufacturing steps and over 100,000 precisely drilled holes. As Zhen Ding Chairman Charles Shen has observed, PCBs are no longer simple connectors. They have evolved into computing components that directly affect the performance and reliability of AI systems.
Chip designers and PCB makers are working together more closely than ever. At the Semiconductor and PCB Heterogeneous Integration Summit in late 2025, executives from TSMC, Intel, and ASE Group discussed how chips and boards must now be designed together from the earliest stages. ASE Vice President CP Hung noted that demand for PCBs and substrates is expected to exceed supply over the next three to five years. For the most advanced substrates used in AI servers, only Japan’s Ibiden and Taiwan’s Unimicron have the necessary capabilities, creating a quiet duopoly in this strategically important market.
Material shortages remain a significant challenge. Chairman Tseng has noted that expanding production of specialized fiberglass takes at least two years, from furnace modification to sample validation. Relief is not expected until late 2026. Structural imbalances between global demand and supplier capacity for low-dielectric-constant glass fiber cloth and advanced copper foil cannot be closed through existing capacity adjustments alone. Until new AI-grade material capacities come online in 2027, material suppliers will retain strong pricing power.
Taiwan’s PCB suppliers enter 2026 with unprecedented demand visibility. Nvidia’s platform transitions to GB300 and Rubin architectures will drive step-function increases in PCB complexity and volume. The proliferation of custom ASIC chips from AWS, Google, Meta, and Microsoft is encouraging manufacturers to invest heavily in substrate and high-density interconnect capacity.
Taiwan’s broader AI supply chain reinforces this momentum. Foxconn reported a 35% year-over-year revenue increase in January 2026 on AI server demand. Wistron posted a record January with AI servers now accounting for 70% of total revenue. TSMC has upgraded its five-year growth plan, forecasting nearly 30% annual revenue growth in 2026. ASE Technology expects advanced packaging and testing revenue to double to US$3.2 billion. This rising tide of AI infrastructure spending flows directly into demand for the boards and substrates that connect everything together.
Taiwan’s PCB ecosystem has achieved a position of structural importance that parallels TSMC’s dominance in semiconductor fabrication. Just as advanced chips cannot be produced without Taiwan’s foundry capabilities, AI infrastructure cannot be deployed without its PCB and substrate solutions. The companies that control these critical technologies determine whether hyperscaler AI ambitions can be physically realized. Their substrates carry the signals that enable AI computation. Their materials expertise enables the high-frequency, low-loss performance that next-generation systems demand. The golden decade for the Taiwan PCB industry has begun.
