SK Hynix moves cooling directly to D2D PHY to tackle rising HBM heat challenges

SK Hynix’s integration of cooling directly into the D2D PHY layer signals a strategic shift from system-level to chip-level thermal management for HBM. This move will force upgrades in TSV and micro-bump processes while pressuring advanced packaging material suppliers to deliver high-thermal-conductivity interface solutions. Amid tightening U.S.-EU export controls on AI accelerators, such an approach may trigger new compliance scrutiny on equipment and EDA tools, raising R&D barriers for non-U.S. players. Samsung will likely accelerate its CoWoS-L alternative, while Micron may pivot toward low-power HBM4 as a differentiation tactic. Within 18 months, thermal architecture will become the decisive bottleneck for HBM3E/HBM4 yield ramp, potentially spawning third-party thermal simulation IP licensing and reshaping memory-logic co-design ecosystems.