Huawei HiSilicon Unveils 'Tau Scaling Law' and LogicFolding Architecture at IEEE ISCAS Shanghai — 1.4nm-Equivalent Chips Targeted by 2031, Bypassing EUV Chokepoint

At the 2026 IEEE International Symposium on Circuits and Systems (ISCAS) in Shanghai on May 25, Huawei HiSilicon president He Tingbo publicly unveiled the 'Tau (τ) Scaling Law' — a new chip engineering principle that reframes the semiconductor scaling challenge away from transistor geometric shrinking and toward reducing signal-travel latency (tau = signal travel time). The Tau Scaling Law underpins Huawei's new 'LogicFolding' architecture, which shortens physical wiring paths inside chips to minimize time for electrons to traverse circuits, achieving a form of effective performance scaling without requiring the ASML EUV lithography equipment that US export controls have blocked from China since 2023. He Tingbo stated that Huawei targets transistor density equivalent to 1.4nm processes by 2031 — near the projected global frontier — and confirmed that Huawei has already mass-produced 381 distinct chips over six years using Tau scaling principles. Kirin smartphone chips launching in Fall 2026 will be the first commercial products to incorporate LogicFolding. The announcement represents the most architecturally significant public disclosure of Huawei's post-sanction chip roadmap since the Kirin 9000S (2023) demonstrated 7nm-equivalent production without EUV. The strategic significance is direct: Huawei's Tau Scaling Law does not attempt to match TSMC's process node roadmap, but rather pursues a distinct engineering path to equivalent practical performance using China's domestically constrained manufacturing environment. This is a direct architectural bypass of the ASML EUV chokepoint rather than a race to close it. Context: Huawei is now projected to reach approximately $12B in AI chip revenue in 2026 (FT/Reuters), up +60% YoY, with its Ascend 950PR holding approximately 60% of China's domestic AI accelerator market after Nvidia CEO Jensen Huang acknowledged on May 21 that Nvidia has 'largely conceded' China's AI chip market to Huawei. DeepSeek V4 (launched April 24, 2026) is the first frontier AI model running natively on Huawei Ascend chips. The Tau Scaling Law announcement reinforces that China's domestic chip roadmap now has a disclosed engineering architecture intended to sustain performance improvement independent of Western semiconductor supply chains at the most advanced fabrication nodes.