US solid-state transformer (SST) developer DG Matrix (North Carolina) announced on September 24, 2026 that it has doubled the output of its Interport™ multi-port SST platform from 200 kW to 400 kW using STMicroelectronics' (ST) latest-generation silicon carbide (SiC) devices. The power module footprint remains essentially the same, and efficiency is stated at above 98.5%.
Alongside the shift to 800 VDC power in AI data centres, SSTs are moving from concept to deployment. What stands out in this announcement is less the efficiency figure than the fact that the power delivered from the same footprint has doubled.
Output Doubled Without a Larger Footprint
DG Matrix has built Interport around ST's SiC technology since the company was founded. According to the release, the doubling comes from performance gains in SiC, and the principle of delivering more power without enlarging the power module footprint is becoming increasingly important to support the growth of large AI data centres.
In a data centre, the space taken by power receiving and conversion equipment competes with the floor space for GPUs. As power per rack rises, the electrical room equipment must densify at the same pace. The announcement can be read as a sign that SST evaluation is widening from conversion efficiency to output per unit of floor area.
Background: 600 kW-Class Racks and the 800 VDC Shift
In its release, DG Matrix cites projections from US research firm SemiAnalysis.
Rack power density
GPU rack power density is rising past 600 kW, and hyperscalers are accelerating the move to 800 VDC distribution.
Scale of 800 VDC
800 VDC power architectures will support roughly 39 GW of new data centre capacity by 2030.
Role of SSTs
SSTs are positioned as a core technology of the 800 VDC transition and a multi-billion-dollar opportunity.
Note that these figures are third-party projections quoted in DG Matrix's release, not the company's own results. The direction, however, is consistent with what has been reported so far about the shift to 800 VDC power.
ST's Role Goes Beyond Supplying Parts
According to DG Matrix, ST has not only supplied SiC devices but also provided technical support to optimise how they are used inside Interport. In return, DG Matrix feeds system-level requirements — voltage, current and thermal performance — back to ST for future generations of its power devices.
The SiC components are the same ones ST supplies for electric vehicle powertrains. The release argues that a track record in automotive, the most demanding power electronics environment, underpins performance and reliability in data centre use. The company also highlights the strong surge current capability of ST's SiC devices as important for handling the transient load swings typical of AI workloads.
ST struck a bullish tone on data centres in its Q2 2026 results. This is one example of SiC proven in high-volume automotive production being redirected into a new class of power equipment, the SST.
Checkpoints for Design and Sourcing
DG Matrix says it will next focus on higher-voltage medium-voltage platforms and on scaling production for hyperscalers, neoclouds and electrification applications, incorporating future generations of SiC technology into its roadmap.
For those evaluating SSTs, three points are worth tracking.
- Output-to-footprint ratio: the electrical room area needed to receive the same power can become a site planning constraint
- SiC source and qualification status: if the parts are the same as automotive, competition with automotive demand and the range of qualified parts become sourcing conditions
- Timing of medium-voltage products: the current 400 kW unit and the higher-voltage medium-voltage products the company is prioritising need to be checked separately
The announcement does not disclose shipment timing, pricing or customer names for the 400 kW unit.