Mitsubishi Chemical, JSW ramp GaN substrate capacity for EVs and data centers

Mitsubishi Chemical and JFE Steel’s GaN substrate expansion is a strategic bet on the power semiconductor roadmap, not just capacity scaling. Technically, large-diameter native GaN substrates will accelerate adoption of 800V architectures in EVs and hyperscale data centers, forcing SiC players to re-engineer cost structures and pushing packaging toward higher thermal conductivity materials. On compliance, tightening U.S.-Japan export controls on critical materials reduces Japan’s supply chain exposure but may inflate capex by over 15% due to restricted equipment access. Competitively, Wolfspeed and IQE will likely fast-track 6-inch GaN production, while Taiwan, China-based suppliers such as Win Semiconductors could capture mid-tier demand gaps. Within 18 months, if GaN substrate yields exceed 70%, a full redesign wave in server power modules and stricter automotive qualification barriers are inevitable.