Infineon Technologies America Corp. has announced it will close its semiconductor manufacturing plant located at 550 West Juanita Avenue in Mesa and terminate 98 positions as it winds down operations at the site by Sept. 30. Company officials confirmed the layoffs, and a Worker Adjustment and Retraining Notification was filed with the Arizona Department of Economic Security on Aug. 3 to inform state authorities of the planned workforce reductions. The work affected includes production, quality control and facility management roles at the facility.
Infineon logo on the exterior of the Mesa semiconductor facility — the site the company closed, resulting in 98 job cuts.
The company said the decision ties to a move away from in-house production of 6/8-inch frontend epitaxy wafers. Those wafers will instead be manufactured primarily by strategic foundry partners under arrangements that shift some manufacturing outside the Mesa site. The closure marks the end of routine manufacturing activities at the Mesa plant, with the company setting a final wind-down date of Sept. 30.
Infineon formally notified state officials of the planned action in early August. The Worker Adjustment and Retraining Notification filing, submitted Aug. 3, identifies nearly 100 positions slated for elimination and specifies that employees engaged in production, quality assurance and facility management will be the most affected. The filing is a legal requirement intended to give workers and state agencies advance notice of significant employment changes so that affected employees may access available services.
Stack of printed 'LAYOFFS NOTICE' sheets — illustrative of the 98 employees affected by Infineon's closure of its Mesa plant.
The Mesa site has a long operational history. It first opened in 1997 and later came under Infineon's ownership in 2015, when the company acquired International Rectifier. That acquisition brought into Infineon's portfolio a set of legacy wafer facilities across North America, including the Mesa plant. Following the acquisition, Infineon continued to invest in the Mesa site rather than immediately abandoning it.
In December 2016, Infineon completed a multi-million-dollar expansion at the Mesa facility that included an 11,500-square-foot addition housing a Gallium Nitride cleanroom and associated warehouse space. City records reflect that investment, which positioned the site to handle work involving Gallium Nitride — a wide-bandgap compound semiconductor cited for its role in high-efficiency power electronics for automotive and industrial applications. The expansion at the time was presented as evidence of continued commitment to the plant and to certain lines of advanced semiconductor manufacturing.
The decision to shutter the Mesa plant follows other notable moves by the company in recent years to restructure its manufacturing footprint. In June 2025, the company sold its 200mm Fab 25 plant in Austin, Texas, to an external U.S. foundry under a long-term supply agreement. The Mesa closure is the latest change in a series of adjustments to how the company organizes production and partners with external manufacturers for certain wafer fabrication work.
Officials at the Mesa site and company representatives have provided the scheduled wind-down date of Sept. 30 for operations there. The Worker Adjustment and Retraining Notification filed with the state lays out the scope of the layoffs and identifies the categories of positions that will be eliminated. No further operational details beyond the shift of 6/8-inch frontend epitaxy wafer production to strategic foundry partners and the timeline for closure were disclosed in the filing.
The plant’s address, 550 West Juanita Avenue, will mark the end of active semiconductor production under the company’s name when the wind-down concludes. The company’s filings and prior municipal records documenting the 2016 expansion remain the public record elements that document the plant’s decades-long presence in Mesa and the investments that were made there over time. The company has confirmed the number of positions affected and the schedule for ceasing manufacturing activities at the site.
For now, state authorities have been formally notified and the company has set the closure timeline and outlined the categories of roles impacted. The administrative paperwork and confirmation by company representatives provide the framework for the transition out of Mesa and the reallocation of certain wafer-production responsibilities to partners outside the plant.
On May 6, 2026 Infineon publicly raised its full‑year guidance, saying adjusted gross margin would be in the low‑to‑mid forties percent range and that adjusted free cash flow was expected to be around €1.65 billion, reflecting stronger than previously forecasted financial performance.
Corporate certification documents list the Mesa site at 550 W. Juanita Ave as holding ISO 9001:2015 and IATF 16949 management‑system certificates that were recorded as valid through February 2025 (ISO certificate valid until Feb. 6, 2025; IATF expiry recorded as Feb. 16, 2025).
City of Mesa industrial pretreatment records identify the 550 W. Juanita Avenue facility as a designated Significant Industrial User with a categorical permit that became effective Oct. 1, 2015 and with permit renewal/expiry entries recorded around Sept. 30, 2020–2021.
Infineon’s 2026 non‑financial/corporate reporting notes the company launched a water‑saving/wastewater project in fiscal 2024 that included several sites, citing Mesa among locations evaluated for water‑use reduction measures.