United Microelectronics Corporation just crossed a line that separates R&D ambition from commercial reality. On July 14, the Taiwanese semiconductor foundry delivered its first mass-produced silicon photonics wafers from its 12-inch Fab 12i facility in Singapore, a milestone that puts UMC squarely in the supply chain for next-generation AI infrastructure.
The wafers coming out of Singapore support SILITH Technology’s 1.6T silicon photonics platform. These chips enable the kind of high-speed optical interconnects that hyperscale data centers need to shuttle massive volumes of data between servers running AI models.
The partnership between UMC and SILITH took roughly 18 months to move from initial development to full-scale manufacturing. UMC’s history with silicon photonics stretches back to 2010, but the company had previously worked with 8-inch wafers. The jump to 12-inch production means more chips per production run, lower per-unit costs, and the kind of manufacturing scale that makes major customers comfortable placing big orders.
The company also laid critical groundwork in December 2025 by licensing imec’s iSiPP300 silicon photonics process platform. That licensing deal gave UMC access to a proven technology stack rather than forcing the company to build everything from scratch. Risk production using the advanced imec-derived process is targeted for the 2026-2027 timeframe.
