Japanese chipmaker Renesas Electronics said on Monday it was on track to restore full capacity by May after a plant fire, as manufacturers around the world battle to secure semiconductor supplies.

By the end of this week, the company hopes to bring production at the blaze-hit factory near Tokyo to 30 per cent of previous capacity, before fully restoring it in May, Renesas chief Hidetoshi Shibata told reporters in an online briefing.

“We remain committed to our plan to achieve 100 per cent in May,” he said. “We have received help not just domestically but from foreign suppliers. And they have been extremely generous. With help from all sorts of outside groups, we miraculously have been able to come this far.”

The news came as car makers battle semiconductor supply problems in part because of increased demand for chips from manufacturers of laptops, tablets and gaming devices. Renesas is a key supplier of automotive semiconductors.

The news came as car makers battle semiconductor supply problems in part because of increased demand for chips from manufacturers of laptops, tablets and gaming devices

It is not yet clear exactly what caused the March fire, which burnt 600 square metres of factory floor.

Japan’s government and some of Renesas’s own customers, including car giant Toyota, have offered help. Shibata did not discuss which firms assisted in restoring the damaged factory and kept mum about which customers would get early supplies of semiconductors.

During a summit on Friday in Washington, Prime Minister Yoshihide Suga and President Joe Biden agreed to “partner on sensitive supply chains, including on semiconductors, promoting and protecting the critical technologies that are essential to our security and prosperity”, according to a joint statement.