Mitsubishi Electric Achieves World’s First Demonstration of Suppression of Frequency Dispersion in GaN Transistors Using GaN Substrates - WebWire

Mitsubishi's GaN-on-GaN breakthrough cracks the material ceiling that has pinned GaN power devices for a decade. The industry was locked into lattice-mismatch penalties on SiC/Si substrates—defect density and frequency dispersion are physics-level constraints no circuit topology fully mitigates. Making the substrate a design variable reshuffles the chain: upstream CVD crystal-growth equipment (Sumitomo, IQE) sees its order logic rewritten; downstream 5G-A PA and 800V EV inverter efficiency ceilings shift upward simultaneously. The strategic chessboard matters more. Infineon and Rohm scale GaN-on-SiC for volume; Sanan and Innoscience grind cost on Si-based routes. Mitsubishi chose the heavier-asset, higher-ceiling path—Japan's "materials define the device" doctrine in action. The risk is unglamorous: GaN single-crystal yield remains stuck at 3-4 inch scale, costs run 3-5x SiC, and Japan's 2023 export controls on semiconductor materials to China have bifurcated the supply chain into parallel tracks. The 18-month watch item is not demo metrics. It is who secures the first stable 6-inch GaN substrate supply agreement. Whoever locks the substrate locks pricing power for 2027 6G PA and solid-state radar markets.