Onsemi drops US$2 billion Czech SiC expansion amid pressure from cheaper Chinese wafers

Onsemi's abandonment of its $2B Czech SiC line isn't a budget cut—it's the quiet collapse of the Western "manufacturing sovereignty" thesis in power semiconductors. Chinese substrate players have crushed 6-inch SiC wafer prices to roughly 40% of Western equivalents, while 8-inch yield curves are climbing faster than projected. Building an end-to-end facility now would embed a 30%+ cost premium over sourcing Chinese substrates—suicidal pricing in a market where EV inverter BOM costs are under existential siege. The ripple is structural. Wolfspeed is mired in Chapter 11, ST's Catania fab runs below 60% utilization, and Infineon's Kulim expansion has visibly decelerated. The Western bloc is collectively retreating into a "design-plus-packaging" asset-light model, ceding the substrate and epitaxy layers to Chinese consolidation. Within 18 months, any EU Chips Act top-up for SiC will likely confront a "built-but-unsellable" paradox: overcapacity colliding with decelerating EV penetration growth. SiC is about to replay the 2019 IGBT capacity-clearing cycle. Onsemi will almost certainly pivot to a "Chinese substrate, Western packaging" hybrid. But that hands the supply-chain chokepoint to the very competitor it was trying to outbuild. In geopolitics, the cost curve is always more honest than political will.