STMicro targets new sources of silicon chip demand

STMicro

STMicro is betting on new sources of silicon chip demand from AI data centres and advanced EV platforms. The company sees silicon and silicon carbide (SiC) devices as core growth engines, even as it trims some near-term capital spending. As a result, STMicro is repositioning its portfolio toward photonics, high-voltage power electronics and next-generation vehicle systems that can unlock new sources of silicon chip demand across several end markets.

Photonics and AI servers anchor new sources of silicon chip demand

STMicro is using silicon photonics to capture new sources of silicon chip demand from hyperscale AI data centres. In the third quarter, the firm reported rising orders for silicon photonics integrated circuit prototypes from its 300mm fabs. This confirms internal expectations that photonics ICs will become a meaningful revenue driver as AI server build-outs accelerate worldwide.

Meanwhile, the company is tightening its integration into the AI infrastructure ecosystem through the Starlight Consortium. The consortium connects substrate suppliers, device makers and system integrators to develop high-speed optical solutions for data centres, telecoms and automotive. In parallel, STMicro is collaborating with Nvidia on an 800V DC AI data centre architecture that combines SiC, gallium nitride (GaN) and silicon technologies. The firm has also demonstrated a GaN prototype with over 98pc conversion efficiency, underscoring how power density and efficiency now drive silicon chip demand as much as raw compute.

SiC, EV power electronics and a more selective capex strategy

STMicro is broadening SiC usage beyond traction inverters and onboard chargers to new power roles in active suspension inverters. This expands the addressable market in EVs just as advanced driver-assistance systems increase demand for sensors and control chips. However, weaker-than-expected EV programmes in Europe and China have delayed the full impact, forcing the company’s main automotive customer to cut orders.

Therefore STMicro is trimming near-term SiC capex as it transitions production from 150mm to 200mm wafers. The company will slow some investments in SiC conversion while maintaining its 300mm expansion plans in Agrate, Italy, and Crolles, France. These fabs continue to see solid order visibility, particularly for data-centre power modules and optical components. STMicro expects EV growth and SiC restocking to resume in 2026, once inventory drawdowns run their course and regional electrification policies translate into firmer demand.

The Metalnomist Commentary

STMicro’s push into photonics and SiC power devices shows how new sources of silicon chip demand are shifting toward AI infrastructure and complex EV systems. For the wider materials chain, this means sustained pull for high-purity silicon, SiC substrates and GaN epitaxy, even if near-term EV softness delays some projects. Suppliers that align with 300mm and 200mm wafer roadmaps and can support AI-class power densities will be best positioned as these new demand waves crystallise from 2026 onward.