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Enphase and Infineon Test 900 V GaN Switch for AI Data-Center Power

Wordless editorial illustration of engineers examining a power semiconductor and a converter module in a data-center power lab; conceptual artwork.

Enphase Energy and Infineon announced a 900-volt gallium nitride switch on October 26 for a solid-state transformer being developed for AI data centers. The companies say they have tested the device and are integrating it into development builds; production qualification is still ahead.

Key Takeaways

  • The new bidirectional switch is rated at 900 volts, compared with earlier 650-volt GaN devices used by Enphase.
  • Its planned application is Enphase’s IQ Solid-State Transformer, which remains under development.
  • The companies expect simpler power conversion, but real-world system efficiency and reliability remain to be demonstrated.

What the switch does

A bidirectional switch can conduct current and block voltage in either direction within one integrated device. Infineon says combining those functions can reduce component counts and support high-frequency power conversion. The company calls this the first 900 V monolithic GaN bidirectional switch; that is its claim, not an independent industry certification.

Comparison of earlier 650-volt and new 900-volt gallium nitride bidirectional switch device ratings
Device voltage ratings, not system efficiency. A rating alone does not establish suitability for a particular DC bus.

The change from 650 V to 900 V is a 250 V, or about 38.5%, increase in the stated device rating. It is not a 38.5% efficiency gain. Switch selection also depends on circuit topology, transient voltages, protection and the manufacturer’s design limits.

Why it matters for AI power

Enphase says higher-voltage devices can help designers use fewer conversion building blocks while switching at high frequencies. The company is developing its transformer to convert medium-voltage AC into power for data-center systems. The predicted gains in size, cost and efficiency are design goals, not published field measurements for this new device.

BitcoinVersus.Tech previously covered Enphase’s Texas power modules, SolarEdge and Infineon’s DC fault-protection work, and Renesas’ 650 V GaN packaging. Conversion and fault interruption are related challenges, but they are different functions.

Enphase’s September announcement described its earlier U.S. module work; the 900 V device announcement came later.

The next milestone is production qualification. Until full-system results and commercial deployment are available, the practical performance of the new switch in an operating AI campus remains an open question.

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