onsemi unveils fourth-generation SiC platform targeting AI, EV and energy applications - New Electronics

onsemi's fourth-generation SiC platform is not a product refresh—it is a strategic lock-in on AI power delivery architecture. When GPU cluster power density crosses the megawatt threshold, the 48V DC bus topology hits a hard thermal wall. SiC MOSFETs are not an upgrade; they are the only path past silicon's efficiency ceiling. Upstream, 8-inch substrate yield remains the binding constraint. Wolfspeed's restructuring did not break the oligopoly—it accelerated Coherent and SICC's capex arms race. onsemi's vertical integration from epi-wafer to module is deliberate margin-pool capture, not engineering pride. The competitive chessboard is shifting. ST and Infineon have third-gen SiC in volume, making onsemi's "fourth-gen" branding a generational intimidation play. But the real disruptor sits in China: Sanan and Silan Micro have embedded 650V SiC into Tier-1 EV supply chains, dragging the price anchor down. onsemi's moat is not substrate—it is the 18-month car-grade reliability certification barrier and AI server power reference designs. Within 24 months, AI data centers will overtake EV as the largest SiC growth vector. The 6-to-8-inch transition will trigger a capacity mismatch and a price war that flushes out mid-tier module players. Winners will be those who own both the device and the system-level design.