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The U.S. has ordered Taiwan Semiconductor Manufacturing Co (TSMC) to halt shipments of advanced chips to Chinese customers that are often used in artificial intelligence (AI) applications starting this Monday, Reuters has reported.

The Department of Commerce sent a letter to TSMC imposing export restrictions on certain sophisticated chips, of 7 nanometer or more advanced designs, destined for China that power AI accelerator and graphics processing units (GPU), a person familiar with the said.

The U.S. order, which is being reported for the first time, comes just weeks after TSMC notified the Commerce Department that one of its chips had been found in a Huawei AI processor. Tech research firm Tech Insights had taken apart the product, revealing the TSMC chip and apparent violation of export controls.

Huawei, at the center of the U.S. action, is on a restricted trade list, which requires suppliers to obtain licenses to ship any goods or technology to the company. Any license that could aid Huawei's AI efforts would likely be denied.

TSMC suspended shipments to China-based chip designer Sophgo after its chip matched the one found on the Huawei AI processor, sources told Reuters last month.

The latest clampdown hits many more companies and will allow the U.S. to assess whether other companies are diverting chips to Huawei for its AI processor. As a result of the letter, TSMC notified affected clients that it was suspending shipments of chips starting Monday, the person said.

“TSMC has had regular discussions with the government on export control issues and has made it clear that it will comply with domestic and international regulations,” Taiwan's economy ministry said in a statement to Reuters, referring specific questions to TSMC.

The Commerce Department communication - known as an "is informed" letter - allows the U.S. to bypass lengthy rule-writing processes to quickly impose new licensing requirements on specific companies.

Ijiwei, a Chinese media site covering the semiconductor industry, reported on Friday that TSMC notified Chinese chip design companies it would suspend 7 nanometer or below chips for AI and GPU customers beginning Nov. 11.

The action comes as both Republican and Democratic lawmakers have raised concerns about the inadequacy of export controls on China and the Commerce Department's enforcement of them.

In 2022, the Commerce Department sent "is-informed" letters to Nvidia and AMD restricting their ability to export top AI-related chips to China, and to chip equipment makers like Lam Research, Applied Materials and KLA to restrict tools to make advanced chips to China. The restrictions in those letters were later turned into rules that apply to companies beyond them.

The U.S. has been delayed in updating rules on tech exports to China. As Reuters reported in July, the Biden administration drafted new rules on some foreign exports of chipmaking equipment and planned to add about 120 Chinese companies to the Commerce Department's restricted entity list, including chipmaking factories, toolmakers, and related companies.

But despite plans for an August release, and later tentative target dates for publication, the rules still have not been issued.

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