Microchip Technology has launched 3.3kV silicon carbide (SiC) power modules purpose-built for solid-state transformers (SSTs) in AI data centers, directly addressing the critical power bottleneck limiting GPU cluster scaling.
Power architecture shift
AI hyperscale data centers face a fundamental constraint: token generation is now limited by power availability, not compute density. Traditional low-frequency transformers and multi-stage AC-DC conversion architectures introduce significant losses and physical bulk. SSTs replace these with high-frequency, semiconductor-based designs that reduce conversion stages and deliver regulated DC directly from the medium-voltage grid to the server rack. This shift is essential for next-generation facilities adopting higher-voltage DC rack distribution.
Module design and performance
Microchip’s HV-D3 mSiC modules integrate 3.3kV SiC MOSFETs and Schottky diodes in a standard 62mm package. The mSiC MOSFET technology offers highly stable on-resistance (RDS(on)) over temperature, while the package supports 6kV isolation, uses CTI 600-rated materials, and extends creepage distances for safe series connection in high-voltage operation. A silicon nitride (Si3N4) substrate enhances thermal conductivity and power-cycling capability, enabling higher power density with less aggressive cooling.
According to Clayton Pillion, vice president of Microchip’s high-power solutions business unit, the modules cut the number of series-connected devices by roughly half compared to lower-voltage SiC alternatives when interfacing to 13.8kV or 34.5kV grids. The modules are available in half-bridge and common-source configurations, with or without anti-parallel Schottky diodes, covering the 100–300A range. The technology balances switching losses for both hard-switched and soft-switched topologies.
Broader application reach
While optimized for AI data center SSTs, the modules serve megawatt charging infrastructure for heavy-duty vehicles, auxiliary power supplies for rail and heavy transportation, medium-voltage motor drives, and industrial or defense power systems. All these markets benefit from the same combination of high isolation, thermal robustness, and efficient conversion. Microchip provides application notes, design guides, simulation models, and global technical support to accelerate adoption.
Outlook
The 3.3kV HV-D3 mSiC modules mark a practical step toward replacing bulky magnetic transformers with semiconductor-based power delivery in the highest-growth energy-intensive environments. As AI data centers push grid interface requirements toward 13.8kV and beyond, this technology directly addresses the need for fewer conversion stages, higher efficiency, and greater power density. The availability of production-quantity modules, combined with comprehensive design support, positions these devices as a foundational building block for the next generation of medium-voltage power architecture.
