SiC Power Play: STMicroelectronics and onsemi Navigate EV Slowdown

STMicroelectronics (STM) and onsemi (ON) are locked in a strategic struggle for leadership in the electric vehicle (EV) semiconductor market. As the industry pivots toward higher efficiency, both firms have positioned themselves as primary providers of Silicon Carbide (SiC) power modules, which are critical for increasing EV range and reducing charging times.

Both companies are now grappling with significant headwinds as the initial surge in global EV adoption has plateaued. This slowdown has triggered a period of inventory corrections across the supply chain, forcing automotive-heavy chipmakers to revise their growth forecasts. While the long-term transition to electrification remains the goal, the immediate reality is a market navigating a difficult transition period.

Divergent Market Strategies

The two companies offer fundamentally different risk profiles based on their portfolio structures. onsemi has adopted an aggressive focus on high-margin automotive power solutions, resulting in very high exposure to the sector. Currently, automotive revenue accounts for over half of onsemi's total turnover, making its financial health tightly coupled with the health of the EV market.

In contrast, STMicroelectronics maintains a broader industrial and automotive portfolio. Beyond SiC power modules, STM produces a wide array of microcontrollers, sensors, and analog products. This diversification provides a buffer that onsemi lacks, allowing STM to offset automotive volatility with revenue from other industrial sectors.

The Investor's Dilemma

For investors, the choice between STM and ON represents a trade-off between concentrated growth and diversified stability. onsemi represents a pure-play bet on the automotive power transition; if EV adoption accelerates again, its high-margin focus could lead to outsized gains. However, this concentration increases the risk of deeper losses during market downturns.

STMicroelectronics offers a more resilient play. By spreading its exposure across various industrial applications, it is better equipped to survive prolonged periods of automotive stagnation. The decision rests on whether an investor prioritizes the aggressive, automotive-centric trajectory of onsemi or the broader stability of STM's diversified business model.

Future Outlook

Market observers are now watching for signs that inventory corrections have bottomed out. The next phase of growth will likely depend on the rollout of more affordable EV models that utilize SiC technology to lower total cost of ownership. While both companies remain leaders in the SiC space, their ability to manage the current plateau will determine who emerges as the dominant supplier in the next wave of electrification.