On 1 October 2026, Infineon inaugurated a backend manufacturing site in Samut Prakan, with Thailand's Prime Minister Anutin Charnvirakul and the company's chief operations officer, Alexander Gorski, present.

Infineon is a major semiconductor manufacturer from Germany focused on automotive, industrial and power applications. Its chips are used in areas such as electric vehicles, charging infrastructure, renewable energy systems and industrial equipment. The Thailand site is part of the supply chain for hardware that manages and converts electrical power.

What happened

The site handles backend manufacturing, including wafer testing and the assembly and testing of power modules and integrated circuits for automotive, industrial and energy applications. Infineon says it complements the expansion of its frontend plants, where the wafers are manufactured.

The Module A site can eventually expand to five modules. Gorski said that scale could make the Samut Prakan facility one of Infineon's largest backend locations. About 350 people work there today, with the company expecting about 1,000 as Module A ramps up.

The Bangkok Post, reporting from the opening briefing, said Infineon put the initial investment above EUR 100 million, or about THB 3.8 billion. Gorski told the paper that the site opens with up to 30,000 square metres of cleanroom space and can expand to 150,000 square metres.

Thailand's Board of Investment, in press release 171/2569, says it expects more than 5,000 skilled local jobs across Modules A to E, about 1,000 in each phase. The board also describes the site as Infineon's third power-module hub, alongside Germany and China, and says that if all five modules are built, it is expected to become the company's largest backend assembly and test centre.

Infineon was already manufacturing in Thailand. On 4 February 2026, it completed the sale of its older backend site in Bangkok and Nonthaburi to Malaysian Pacific Industries, while keeping a long-term supply agreement with the buyer. Through subsidiaries that trade as Carsem, Malaysian Pacific Industries has packaged and tested chips for outside customers for more than 50 years, including power-management devices and silicon carbide and gallium nitride parts. It also took on the production staff at the older site.

Infineon said the two decisions complement each other. The older production line stays with a supplier the company already uses, while the new facility gives Infineon its own backend capacity in Thailand and room to expand it.

The wafer is still fabricated in a frontend plant. At Samut Prakan, the wafer is tested, then power modules and integrated circuits are assembled and tested. This is the stage at which the semiconductor becomes a packaged component for a vehicle, an industrial machine or an energy system. The board also says Module A includes a prototype research and development centre, and describes a highly automated factory with robotics and automated material handling.

What it means

At the inauguration, Gorski pointed to Thailand's location and room to grow. He described the site as a hub in the heart of Southeast Asia, with access to logistics and a fast-growing industrial ecosystem, allowing Infineon to spread production across regions and keep capacity flexible. In the board's account, Gorski cited Thailand's automotive and electronics base and its established semiconductor cluster.

The Bangkok Post reported Gorski citing proximity to markets such as China. In February, when explaining why Infineon would retain a presence in Thailand after selling its older site, the company also pointed to the semiconductor ecosystem and the supplier and partner network it had already built there.

That network extends beyond Thailand. Infineon dates a backend site in Melaka to 1973 and a wafer plant in Kulim to 2006, where it has been adding silicon-carbide wafer capacity. Samut Prakan adds a separate backend site for automotive, industrial and energy demand in Asia.

The facility is also notable for bringing several backend processes together. The board says it is the first Infineon plant to combine wafer testing, power-module assembly and integrated-circuit testing in one location.

If all five modules are built, the site would expand from today's Module A into a much larger in-house backend operation. The board says the completed cleanroom would be about twice the footprint of Infineon's current largest backend plant and could become its largest centre for backend assembly and testing.

For Thailand, the significance therefore goes beyond the jobs inside the facility. Backend manufacturing requires engineers, technicians, equipment suppliers, logistics providers and other specialist services. An operating facility can also give semiconductor companies a reason to develop adjacent capabilities in the country.

What to watch

• Whether Thailand can build a deeper semiconductor ecosystem around backend manufacturing. Infineon's site brings wafer testing, power-module assembly and integrated-circuit testing into one operation. The value for Thailand will extend beyond the jobs inside the plant if local suppliers, engineering talent, logistics providers and other semiconductor companies build around that capacity.

• Whether more of the semiconductor value chain follows. Investment in advanced testing, packaging, semiconductor design and related engineering would show Thailand adding capabilities around Module A. A frontend plant would be a larger step.

• Whether Southeast Asia becomes more integrated across different stages of chip production. Infineon already has wafer fabrication and backend operations in Malaysia, while the new Thai facility adds another node closer to Asian automotive and electronics markets. If other semiconductor companies build complementary capabilities across Thailand, Malaysia and neighbouring markets, the region could become more deeply connected across the semiconductor value chain.