Bosch Launches 3rd Generation SiC MOSFETs

Why It Matters

The performance gains and cost reductions make SiC power semiconductors viable for a broader range of electric vehicles, accelerating the shift away from silicon and enhancing overall EV efficiency.

Key Takeaways

• 20% lower on‑resistance improves EV inverter efficiency
• Die thickness cut 40% boosts heat dissipation and power density
• 10% higher short‑circuit withstand enhances device ruggedness
• 200 mm wafer shift raises chip output per wafer, cutting costs
• Dual‑channel trench architecture enables smaller, cheaper SiC modules

Pulse Analysis

Silicon‑carbide technology has become a cornerstone of high‑efficiency electric‑vehicle powertrains, yet its adoption has been hampered by cost and manufacturing complexity. Bosch’s third‑generation SiC MOSFETs address these barriers by integrating a dual‑channel trench design that slashes specific on‑resistance by one‑fifth, directly translating to lower conduction losses in inverters. The thinner 100 µm die not only reduces material usage but also brings the active layer closer to the heat sink, improving thermal conductivity and allowing designers to pack more power into smaller footprints. Together, these technical refinements enable automakers to achieve higher power density without compromising reliability.

Beyond raw performance, Bosch’s shift to 200 mm wafer fabrication marks a pivotal step in scaling SiC production. Larger wafers increase the number of chips per batch, driving down per‑unit costs and making SiC modules more competitive with traditional silicon alternatives. The added p‑type shielding and two‑zone JFET structures enhance gate‑oxide reliability and short‑circuit tolerance, crucial for the demanding automotive environment where voltage spikes and rapid switching are routine. These manufacturing efficiencies align with Bosch’s design‑for‑manufacturability philosophy, ensuring that the Gen 3 devices can be introduced to the market without extensive retooling.

The broader industry impact is significant. As cost differentials narrow, mid‑range and mass‑market EV manufacturers can adopt SiC inverters, unlocking gains in range, charging speed, and overall vehicle efficiency. This could accelerate the phase‑out of silicon‑based power modules, prompting a cascade of redesigns across supply chains—from thermal management systems to vehicle architecture. Moreover, the improved ruggedness and thermal performance support higher operating temperatures, reducing cooling system complexity and weight. In sum, Bosch’s Gen 3 SiC MOSFETs not only push the technology’s performance envelope but also reshape the economic equation, positioning SiC as the new standard for next‑generation electric mobility.