South Korean suppliers ramp up hybrid bonding R&D beyond HBM5

South Korean suppliers' aggressive push into hybrid bonding stems from the physical bottlenecks of interconnect density and thermal dissipation beyond HBM5. This pressures upstream equipment makers like EVG and Tokyo Electron to achieve sub-micron alignment accuracy and accelerates the shift from organic interposers to silicon photonics. Tightening U.S. export controls on advanced packaging will compel Korean firms to build non-U.S. toolchains, raising capex by 15–20% in the short term. TSMC and its Taiwan, China-based ecosystem, leveraging CoWoS leadership, are poised to lock in NVIDIA and AMD orders, creating a self-reinforcing tech-capacity loop. If hybrid bonding yields fail to exceed 90% within 18 months, HBM cost curves will spike, forcing AI chip designers toward Chiplet-based heterogeneous integration and fundamentally reshaping the advanced packaging landscape.