Think of electricity as a river. Coming out of the dam (the grid), it flows at very high pressure (high voltage). To make it useful inside a building, you need to step it down through a series of pressure-reducing valves until it reaches a faucet you can actually drink from. Every "valve" is a power semiconductor. Most are tiny silicon chips. The newest, most demanding ones — for EVs, AI servers, and grid infrastructure — use silicon carbide (SiC) for high-voltage stages or gallium nitride (GaN) for very fast switching.
For AI servers, this matters a lot. Every electron going to an AI chip is converted 4–5 times: transformer step-down → rectifier → SiC/GaN power conversion → board-level DC-DC → on-chip voltage regulator. NVIDIA's Rubin generation is moving the datacenter to an 800-volt high-voltage DC architecture — which requires SiC and GaN at every conversion stage. Navitas was named NVIDIA's lead GaN partner. Monolithic Power Systems owns an estimated 60–70% of the PMIC (power management IC) content on every Blackwell GPU.
Beneath all of that sits the grid : transformers and switchgear made by Eaton, Hubbell, and nVent — sold out 24+ months — needed to connect AI datacenters to the rest of the electrical world. You cannot have AI without power conversion at every layer.
The chip that sits inches from every NVIDIA GPU and converts 48V down to ~1V for the cores. Monolithic Power owns 60-70% of that on Blackwell.
A modern GPU runs at ~1V but pulls 1,000+ amps. The power has to come into the rack at 48V (soon 800V on Rubin) and step down through a chain of converters to land at the GPU's voltage with sub-millivolt precision and sub-nanosecond response. The chip that does the final-stage conversion is a Power Management IC (PMIC) or Voltage Regulator Module (VRM) . Per industry analysis, Monolithic Power Systems holds an estimated 60–70% PMIC share on NVIDIA Blackwell GPUs. Vicor sells the next-generation "factorized power" architecture — 800V down to core voltage. Texas Instruments owns the broader analog market.
Once a GPU's reference design is locked with a specific PMIC, the relationship is durable. Every NVIDIA generation re-opens that competition — but the incumbents have decades of co-design IP that's hard to dislodge.
~60-70% Blackwell PMIC share. FY26 Enterprise Data segment guide raised to 50%+ growth.
Makes power-management chips that sit next to NVIDIA GPUs and convert 48V down to ~1V for the cores . Per industry analysis, estimated ~60–70% Blackwell PMIC share. Q1 2026 beat. FY26 Enterprise Data segment guide raised to 50%+ growth. The cleanest pure-play exposure to NVIDIA's per-GPU power-content increase.
Factorized power architecture for 800V → core voltage. Q1 bookings $237M, book-to-bill >2:1. Capacity expanding 350% to $3.5B run rate.
Specialty power-conversion company with a unique "factorized power architecture" that converts 800V to core voltage with much higher efficiency than conventional designs. Q1 bookings $237M (book-to-bill above 2:1). Expanding capacity 350% to $3.5B run rate. The single most aligned name with the NVIDIA 800V Rubin transition.
Dominant analog. Q1 revenue $4.83B (+7% beat); analog +22% YoY.
Dominant broad analog franchise. Q1 revenue $4.83B (+7% beat); analog +22% YoY. Less AI-pure-play than MPWR or Vicor, but vastly broader exposure across every electrified end market — autos, industrial, datacenter. Lower-beta way to own the analog cycle.
High-end analog and mixed-signal. Datacenter and industrial leverage.
High-end analog and mixed-signal leader. Datacenter, industrial, and auto exposure. Lower-beta, higher-margin alternative to TXN. Less AI-pure-play but durable compounder.
SiC is the material that makes 800V AI datacenter power and high-end EV motors possible. Four companies dominate.
Silicon carbide (SiC) chips can handle much higher voltages and switching speeds than regular silicon — making them essential for EV traction inverters (Tesla, BYD, every premium EV uses SiC), high-end charging infrastructure, and the new 800V AI HVDC architecture NVIDIA is rolling out with Rubin. Three companies lead by revenue: onsemi (US), STMicroelectronics (Europe), Infineon (Germany) , with Rohm (Japan) as a strong #4 and Coherent as a wafer #2. Wolfspeed is the post-bankruptcy turnaround story — emerged from Chapter 11 in September 2025 with 70% less debt and produced the first 300mm SiC wafer in January 2026.
SiC wafer manufacturing is hard. SiC device design requires decade-scale know-how. The barriers to entry have shaken out the weakest players (Wolfspeed bankruptcy), leaving the survivors with stronger pricing power.
Leading SiC supplier to autos with rapid growth in AI datacenter exposure.
US-listed SiC leader to autos with rapid growth in AI datacenter exposure . EliteSiC product line is the design-win standard at multiple EV OEMs and increasingly at hyperscaler datacenters for 800V HVDC architectures.
SiC leader by revenue. Datacenter SiC >$500M in 2026; space business >$1B.
European semiconductor leader. SiC leader by revenue. Datacenter SiC over $500M in 2026; Space business over $1B. Auto cycle recovery + AI datacenter exposure. Diversified across power, MCUs, and image sensors.
Global #1 power semis. Forecast 60-70% PMIC share on certain Blackwell SKUs (alternative analyst takes).
German global #1 in power semiconductors. Some analyst forecasts cite 60-70% PMIC share on certain Blackwell SKUs (competing with MPWR's claim). Strongest balance sheet in power semis + best EV/AI demand mix. Lower-beta European exposure.
Post-Chapter 11 reset. First 300mm SiC wafer produced Jan 2026. Renesas equity stake.
Emerged from Chapter 11 September 29, 2025 with ~70% debt reduction, maturities extended to 2030, 60% lower cash interest. January 2026 produced the first 300mm (12-inch) SiC wafer — a generational manufacturing breakthrough. New TOLT (Top-Side Cooled) package portfolio for AI/datacenter power supplies launched January 29, 2026. Renesas reissued equity stake in January 2026 with CFIUS clearance. Still unprofitable; very high beta; bankruptcy emerged less than a year ago. Pure post-restructure speculation. Size very small.
NVIDIA named Navitas its lead GaN partner for Rubin's 800V architecture (May 2025). That single announcement transformed the GaN investment thesis.
Gallium nitride (GaN) is the other "wide-bandgap" semiconductor besides SiC. GaN can switch at much higher frequencies than silicon or SiC, making it ideal for high-frequency power converters — including consumer fast-charging and, critically, the new NVIDIA 800V HVDC datacenter architecture . In May 2025, NVIDIA publicly named Navitas its lead GaN partner. Power Integrations is the older, more established high-voltage IC player with a building GaN portfolio.
If Rubin's 800V launches on time and Navitas successfully scales production, the design-win lock-in could fund years of growth. If it doesn't, both Navitas and Vicor have to find a new growth narrative.
NVIDIA's named lead GaN partner for 800V HVDC datacenter architecture (announced May 2025).
NVIDIA's named lead GaN partner for the 800V HVDC datacenter architecture that ships with Rubin in late 2026. GaNFast and GeneSiC product lines. Also serves consumer fast-charging (USB-C PD chargers). $122M ATM equity raise underway. Unprofitable; cash burn elevated.
Established high-voltage IC leader with a building GaN portfolio.
Established high-voltage IC leader; GaN portfolio building. Less leveraged to NVIDIA than Navitas — but profitable and less binary. The lower-beta way to play GaN.
You can build the world's best AI chip and the perfect cooling system. None of it works without grid-scale power. Eaton, Hubbell, and nVent are sold out 24+ months.
AI datacenters are pushing the US electrical grid past its limits. Transformers (gray boxes that step voltage down) and switchgear (the boxes that route power) are sold out 24+ months . The crisis has created a generational opportunity for Eaton, Hubbell, and nVent — the dominant US power-distribution names. Separately, hyperscalers are increasingly going behind-the-meter for primary power: Generac (backup generators), Cummins (large generators and engines), and Bloom Energy (fuel cells with multiple hyperscaler deals in 2025).
Transformer factories take 3+ years to build. The grid is full. Hyperscalers are paying any price to lock up power. The pricing power has shifted fully to suppliers.
Power distribution + cooling (Boyd Thermal). Cross-listed in Sectors III, X, and XII.
Already covered in Cooling (Sector X) and Non-AI Energy (Sector III). Listed here for completeness — Eaton's grid power distribution business is one of the prime beneficiaries of the transformer/switchgear shortage. The most diversified single name in this entire document.
Electrical components and utility-grade transmission gear. Grid-scale bottleneck pure-play.
Electrical components and utility-grade transmission gear. Pure-play grid-bottleneck exposure — every transformer, every distribution panel, every utility-grade connection. Less diversified than Eaton; cleaner electrical-grid exposure.
Schroff (racks) + Erico (electrical) + datacenter cooling. Cross-listed in Sectors X and XII.
Already covered in Cooling (Sector X). The Erico electrical-connection division and Schroff rack systems make nVent dual-exposed across the cooling and power-distribution chokepoints.
AI fuel cells. Multiple hyperscaler deals in 2025 for behind-the-meter primary power.
Solid-oxide fuel cells for behind-the-meter primary power at datacenters . Multiple hyperscaler design wins in 2025 (AEP, Equinix, several confidential). The faster way to give a hyperscaler 100+ MW than waiting 3 years for a transformer + grid connection. High beta; binary on whether fuel-cell economics scale.
Generac = backup generators (residential + commercial). Cummins = large generators and natural-gas engines for datacenters.
Backup and prime-power generation. Cummins large natural-gas engines are increasingly used as bridge primary power at new datacenter campuses pending grid connection. Generac is more residential/SMB-focused. Cyclical but real AI-driven demand.