Huawei Unveils ‘Tau’s Scaling Law’ to Bypass US Chip Sanctions

Tingbo He, president of Huawei’s chip-design subsidiary HiSilicon, has announced a new semiconductor design strategy titled Tau’s Scaling Law. Presented at the IEEE International Symposium on Circuits and Systems in Shanghai, the approach marks a strategic pivot away from traditional transistor miniaturisation, known as Moore’s Law, towards optimising computations across entire computing systems and interconnects. He described the method as a "big leap ahead" rather than a continuation of existing industry trends, stating it has replaced Moore’s Law as HiSilicon’s guiding principle.

The announcement addresses the physical limits of geometric scaling, where quantum effects interfere with transistor functionality at nanometer scales. US export controls currently prohibit Huawei from accessing TSMC, the world’s leading chip foundry, forcing reliance on China’s SMIC, which utilises older lithography technology. Estimates suggest China’s chipmaking capabilities remain more than five years behind the leading edge, with sanctions specifically intended to restrict the development of frontier artificial intelligence using domestic silicon.

He highlighted specific technical advancements within the new framework, including LogicFolding, which reduces the time required for key logical operations within a circuit. The strategy also emphasises improving chip-to-chip communication through advanced interconnects. He noted that reducing the time data spends moving between chips is as critical as shortening compute time for both AI training and inference, suggesting the company is leveraging techniques such as hybrid bonding and 3D chip stacking to overcome manufacturing constraints.

Huawei intends to demonstrate the viability of this approach with a new chip before winter 2026. The company projects that Tau’s Scaling Law will enable components with performance equivalent to a 1.4-nanometer chipmaking process by 2031. This timeline would significantly narrow the gap with Western technology, particularly as TSMC is expected to introduce chips using the 1.4-nanometer process in 2028.

The move suggests that sanctions aimed at limiting China’s semiconductor industry may have spurred innovations allowing for a more advanced domestic chip ecosystem. While independent analysts note that the strategy reflects the limits of squeezing performance from shrinking chips alone, Huawei remains confident in the technology. He stated that these innovations are expected to enter mass production from 2027 onwards, potentially eroding America’s technological edge in the global AI race.