onsemi introduces EliteSiC M4 fourth-gen silicon carbide platform, with up to 30% higher power density and 35% lower losses - Semiconductor Today

onsemi's M4 launch is not an incremental spec bump—it is a design-rule reset. A 30% power-density gain and 35% loss reduction mean 800V automotive inverters can shrink by roughly a quarter, cascading into simplified thermal stacks and lower BOM. For OEMs, this is a PCB-re-layout trigger, not a drop-in swap. Upstream, the pull accelerates 8-inch SiC substrate demand, intensifying the yield race between Wolfspeed and Coherent. Chinese substrate players like SICC and SanAn are scaling into this exact window, creating a dual-track supply dynamic that complicates single-source qualification strategies. On the policy front, CHIPS Act subsidies grant onsemi's Colorado and Texas fabs a structural cost edge over EU and Asian rivals. Yet substrate concentration remains a quiet vulnerability—no amount of device-level innovation fully insulates against upstream chokepoints. Competitively, Infineon's CoolSiC Gen4 and STMicro's PowerNew refresh cycles face a ticking clock. If onsemi locks design wins in the 2025-26 window, the automotive SiC share map redraws before rivals' next-gen parts clear AEC-Q101 qualification. Over the next 18 months, expect 15-20% price compression in the 650V-1200V MOSFET segment as second-source qualification accelerates. The real disruption is not the transistor—it is the system-level architecture it unlocks.