Infineon Technologies America Corp. is shutting down its semiconductor manufacturing plant at 550 West Juanita Avenue in Mesa, laying off 98 workers as the German chipmaker winds down operations by September 30. The company is shifting production of its 6/8-inch frontend epitaxy wafers out of Mesa, sending that work mainly to strategic foundry partners rather than keeping it in-house.
A company spokesperson confirmed the layoffs, as first reported by KTAR News 92.3 FM. Infineon filed a Worker Adjustment and Retraining Notification with the Arizona Department of Economic Security on August 3, notifying the state of the coming cuts. Workers in production, quality and facility management roles will bear the brunt of the layoffs, according to the filing.
A Plant With Nearly Three Decades of History
The Mesa facility first opened in 1997 and became part of Infineon's holdings in 2015, when the company acquired International Rectifier, according to Phoenix News Today. International Rectifier had owned legacy wafer facilities across North America that Infineon absorbed as part of that deal.
Infineon didn't walk away from the site right after taking it over. In December 2016, the company completed a multi-million-dollar expansion at the Mesa plant, adding an 11,500-square-foot facility with a Gallium Nitride cleanroom and warehouse space, per the City of Mesa. Gallium Nitride is a wide-bandgap compound semiconductor used in high-efficiency power electronics for automotive and industrial markets, making the investment a sign the company once saw a future for the site.
Part Of A Broader Retreat From Legacy Fabs
The Mesa closure isn't an isolated decision. It follows Infineon's June 2025 sale of its 200mm Fab 25 plant in Austin, Texas, to U.S. foundry SkyWater Technology under a long-term supply agreement, a move that signaled the company was systematically divesting legacy fab capacity in favor of outside partners. The Mesa site's 6/8-inch frontend epitaxy work reflects that same category of mature, smaller-node manufacturing that Infineon has been outsourcing.
The pattern extends beyond U.S. borders. In June 2026, Infineon announced plans to transfer back-end assembly and testing operations out of its Tijuana, Mexico plant, another legacy International Rectifier facility, to other global manufacturing sites, per Conevo. Taken together, the moves suggest a company rebalancing both front-end and back-end manufacturing across North America rather than retreating from any single market.
Infineon Isn't Leaving Arizona Entirely
Despite the Mesa shutdown, Infineon maintains a corporate footprint in Greater Phoenix through its research and development facility in neighboring Chandler, according to the Greater Phoenix Economic Council. Chandler has become a key hub for chip design and R&D among several global microelectronics firms, meaning Infineon's presence in the region continues even as its Mesa manufacturing floor goes dark.
Mesa's Chip Ecosystem Keeps Growing Around The Closure
The Mesa closure lands against a backdrop of continued investment in the city's semiconductor supply chain. Equipment services firm KoMiCo opened a $60 million, 125,000-square-foot facility in Mesa in January to support nearby chipmakers, as Hoodline reported. Transport giant DSV also broke ground this year on a 950,000-square-foot regional headquarters in Mesa designed to support logistics for technology and semiconductor manufacturers.
The broader East Valley chip corridor has also drawn massive federal backing. Up to $8.5 billion in proposed CHIPS Act direct funding is earmarked for Intel Corporation's manufacturing and modernization projects in Chandler, according to the National Institute of Standards and Technology. In north Phoenix, the U.S. Department of Commerce awarded up to $6.6 billion in direct CHIPS Act funding to support TSMC's $65 billion three-fab complex, a project expected to create 6,000 direct manufacturing jobs.
State Help For Displaced Workers
Arizona has also moved to build a pipeline for tech workers amid the industry's churn. Governor Katie Hobbs launched the ReadyTechGoAZ workforce training initiative across state community colleges in June, a program fast-tracking training for high-tech and semiconductor jobs. Whether any of the 98 workers losing their jobs in Mesa will make use of that program is not addressed in the available reporting.
The contrast is stark: a plant that once employed roughly 100 people is closing on the same stretch of the Valley where tens of billions of dollars are being poured into mega-scale, leading-edge fabrication hubs. For the workers affected by September 30, the region's booming chip economy offers little immediate comfort, even as it reshapes Mesa's industrial landscape around them.
