Microchip ships 3.3 kV SiC power modules for solid-state transformers in AI data centers

Microchip has launched its 3.3 kV HV‑D3 mSiC power modules, targeting solid-state transformer (SST) designs for AI hyperscale data centers and other high-voltage power applications. The modules are built around 3.3 kV silicon carbide mSiC MOSFETs and Schottky diodes, with the goal of enabling more direct and efficient power conversion from the medium-voltage grid down to server-rack distribution.

The HV‑D3 mSiC modules integrate 3.3 kV SiC MOSFETs and Schottky diodes in an industry-standard 62 mm package. Microchip lists 6 kV isolation, CTI 600-rated materials, and extended creepage distances, with the mechanical and insulation design intended to support safe series connection for high-voltage operation. The modules use a silicon nitride (Si₃N₄) substrate for thermal conductivity and power-cycling capability, aimed at higher power density without pushing cooling as hard.

For data center power architects, the SST angle is the real story. Moving conversion closer to the rack, and reducing the number of conversion stages between medium-voltage service and regulated DC, is one of the cleaner paths to claw back efficiency while supporting higher rack power. But SST designs live or die on switching losses, insulation coordination, and thermal margins, so module-level details like substrate choice, creepage, and isolation ratings matter as much as the silicon.

Microchip is offering the HV‑D3 mSiC power modules in half-bridge and common-source configurations, with and without anti-parallel Schottky diodes. The line targets applications in the 100–300 A range. Clayton Pillion, vice president of Microchip’s high-power solutions business unit, said the 3.3 kV modules can “reduce the number of series connected devices by roughly half versus lower-voltage SiC alternatives when interfacing to 13.8 kV or 34.5 kV grids.”

Beyond SSTs for AI data centers, Microchip also points to applications including megawatt charging infrastructure for heavy-duty vehicles, auxiliary power supplies for rail and heavy transportation, medium-voltage motor drives, and industrial and defense power systems.

Microchip says the modules are supported by an application note, design guide, and device and simulation models for prototyping. The 3.3 kV mSiC power modules are available to purchase in production quantities through Microchip and authorized distributors. More information is available at microchip.com/sic.