--- title: "Infineon is inside Nvidia's 800-volt AI racks and Enphase's 900-volt transformers; Nov. 10 decides the margin" description: "Infineon's GaN power chips are now named into Nvidia's 800V racks and Enphase's AI transformers, but the November 10 results decide whether that design slot is profit or just revenue." publisher: "The Inference" section: "Chips" published: 2026-10-26T16:08:58.111Z modified: 2026-10-26T16:08:58.111Z canonical: https://theinference.org/article/infineon-is-inside-nvidia-s-800-volt-ai-racks-and-enphase-s-900-volt-transformers-nov-10-decides-the-margin language: en keywords: "Infineon, Nvidia, Enphase Energy, Power Semiconductors, GaN, AI Data Centers" --- # Infineon is inside Nvidia's 800-volt AI racks and Enphase's 900-volt transformers; Nov. 10 decides the margin > Infineon's GaN power chips are now named into Nvidia's 800V racks and Enphase's AI transformers, but the November 10 results decide whether that design slot is profit or just revenue. Infineon landed two named AI-power customers in six days, and on November 10 it has to show what that power earns. On October 21 the German chipmaker said it will [supply gallium nitride chips for Nvidia's 800-volt DC datacenter racks](https://www.thelec.net/news/articleView.html?idxno=14857), and today [Enphase named Infineon's world-first 900V GaN bidirectional switches](https://www.globenewswire.com/news-release/2026/10/26/3388031/20176/en/enphase-energy-and-infineon-announce-world-s-first-900-v-gan-bidirectional-switch-devices-for-ai-data-center-solid-state-transformers.html) for its AI-datacenter solid-state transformers. The world's largest power-chip maker is no longer selling components into AI; it is being designed into the power architecture itself. ## The Nvidia slot deepens [Nvidia](https://theinference.org/markets/companies/nvidia) is rebuilding the datacenter from AC to 800V DC delivery, because a megawatt rack loses too much power and copper on the old approach [1]. Infineon's chips sit in the intermediate bus converters that step 800V down to the 50, 12 and 6 volts boards use, switching up to 1MHz so transformers and inductors shrink and more compute fits the same rack [1]. A year ago Infineon supplied the rack protection circuits; now it owns a conversion layer every AI server passes through. That is a compounding position, not a one-off order. [Enphase](https://theinference.org/markets/companies/enphase-energy) extends the same GaN line to 900V, keeping components under 1kV while cutting the number of converters in the power path [2]. Behind both customers sits supply: a [multi-year 200mm SiC wafer deal with Wolfspeed](https://www.powerelectronicsnews.com/infineon-and-wolfspeed-extend-sic-wafer-supply-agreement/), extending a 20-year relationship [5]. ## The tailwind is priced, the profit is not Analyst houses see power devices, the chips that convert and condition all this electricity, growing steadily through 2031, with wide-bandgap SiC and GaN designs doubling their share of market value to 31% [6]. Chinese suppliers such as TanKeBlue are meanwhile raising billions to scale [6]. The tailwind is real. *Chart: **Analysts see the power device market growing well past $40 billion** Bars ranking analyst forecasts for the power device and power electronics market: Yole at $41.3 billion and Mordor Intelligence at $43.6 billion, both by 2031, and IDTechEx at $56.2 billion over a ten-year horizon.* *Analyst forecasts of the power device / power electronics market, US$ billions; horizons differ, IDTechEx projects over ten years rather than to 2031. Sources: Yole Group and analyst figures as reported by Power Electronics World and Power Electronics News. [5][6]* But the market has priced Infineon's story, not its profit: AI-server revenue is projected at roughly EUR 1.5 billion in 2026, growing over 100%, while shares fell 3.1% this month on doubts about how customers' capex is financed [3][4]. [The valuation already demands a large earnings jump through 2027](https://www.ad-hoc-news.de/boerse/news/unternehmensnachrichten/infineon-s-ai-power-push-meets-its-toughest-auditor-the-profit-line/70379350) [3]. ## November 10 referees Everyone can name the customers now. The November 10 print has to answer the harder question, whether AI power is margin or marketing. Watch it, because whoever turns AI's power problem into profitable silicon is doing the work that makes the whole buildout run. ## Takeaway Infineon has gone from rack protection circuits to named conversion layers in Nvidia's 800V racks and Enphase's 900V transformers in a year, but the market has priced the story: November 10 must show AI power earning margin, not just revenue. ## Sources 1. [The Elec, Infineon to Supply GaN Power Chips for Nvidia's 800V Data Centers, 25 October 2026](https://www.thelec.net/news/articleView.html?idxno=14857) 2. [GlobeNewswire, Enphase Energy and Infineon Announce World's First 900 V GaN Bidirectional Switch Devices for AI Data Center Solid-State Transformers, 26 October 2026](https://www.globenewswire.com/news-release/2026/10/26/3388031/20176/en/enphase-energy-and-infineon-announce-world-s-first-900-v-gan-bidirectional-switch-devices-for-ai-data-center-solid-state-transformers.html) 3. [Ad-hoc-news, Infineon's AI Power Push Meets Its Toughest Auditor: The Profit Line, October 2026](https://www.ad-hoc-news.de/boerse/news/unternehmensnachrichten/infineon-s-ai-power-push-meets-its-toughest-auditor-the-profit-line/70379350) 4. [Ad-hoc-news, Infineon's Product Pipeline Runs Ahead of a Share Price Tied to Sector Mood, October 2026](https://www.ad-hoc-news.de/boerse/news/unternehmensnachrichten/infineon-s-product-pipeline-runs-ahead-of-a-share-price-tied-to-sector-mood/70393729) 5. [Power Electronics News, Infineon and Wolfspeed Extend SiC Wafer Supply Agreement, October 2026](https://www.powerelectronicsnews.com/infineon-and-wolfspeed-extend-sic-wafer-supply-agreement/) 6. [Power Electronics World, Yole forecasts solid growth as power device market dynamics shift, 21 October 2026](https://www.powerelectronicsmagazine.net/article/125680/Yole_forecasts_solid_growth_as_power_device_market_dynamics_shift) --- Infineon is inside Nvidia's 800-volt AI racks and Enphase's 900-volt transformers; Nov. 10 decides the margin — The Inference. Canonical: https://theinference.org/article/infineon-is-inside-nvidia-s-800-volt-ai-racks-and-enphase-s-900-volt-transformers-nov-10-decides-the-margin