Vertical GaN Power Devices Set to Transform High-Voltage Electronics: onsemi Pushes Beyond Silicon and Lateral GaN Limits

The Next Leap in Power Electronics Has Arrived

From electric vehicles and grid-scale storage to hyperscale AI compute clusters, today’s most power-intensive systems are rapidly outgrowing the limits of traditional silicon-based components. Even lateral GaN devices—once considered the frontier of efficiency—are hitting voltage and thermal ceilings.
Into this gap steps Vertical GaN (vGaN), a new class of power device that does not merely upgrade GaN technology but redefines how electrons travel through a power semiconductor.

With its official release of GaN-on-GaN vertical devices, onsemi has positioned itself at the center of what analysts now describe as the next $10-billion transition in power electronics.

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Why Vertical Structure Is the Breakthrough

Traditional GaN devices conduct power laterally across the surface of the semiconductor layer, which limits scalability when voltage, current, or heat rise. Vertical GaN reverses this structure:
✔ Current flows through the thickness of the device
✔ Electric field spreads vertically, not across the surface
✔ Breakdown voltage scales with thickness, not chip area

This shift enables multi-kilovolt capability, ultra-fast switching and extremely compact designs without sacrificing thermal or reliability margins.

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The Technology Foundation: What “GaN-on-GaN” Really Means

Unlike GaN-on-silicon or GaN-on-sapphire, vGaN is grown directly on native GaN substrates. That single change impacts everything:

This is what enables claims such as “50% lower energy loss, 2–3× higher power density, and half-size passive components.”
It’s not marketing hype—it’s physics.

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From R&D to Real Deployment: What onsemi Has Actually Delivered

While many semiconductor companies showcase vertical GaN in academic papers or R&D prototypes, onsemi is one of the first to:

✅ Develop full wafer-level fabrication in-house
✅ Secure more than 130 global patents across process + packaging + system use
✅ Begin sampling 700V and 1200V parts to early customers
✅ Target not consumer electronics but industrial, automotive, data center, aerospace grade power blocks

The company is not just introducing a new transistor—it is rolling out an ecosystem shift, including drivers, reference designs and thermal models for system integrators.

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Why the Industry Needs This Breakthrough Now

It’s not a coincidence that vertical GaN arrives at the same moment the world is facing a massive energy-to-computation conversion problem.

⚡ Data centers are scaling to 100+ MW sites

ChatGPT-level AI inference clusters require entire substations to power a single data hall.
The cost bottleneck is no longer GPUs—it is power conversion and heat.

⚡ EVs are moving from 400V to 800V and 1000V platforms

The switch to high-voltage drivetrains demands components beyond silicon IGBTs and lateral GaN.

⚡ Renewable power conversion is hitting stability walls

Solar and wind inverters must handle >1500V DC strings and extreme temperatures.

⚡ Storage and microgrids require bidirectional high-frequency power blocks

Legacy silicon adds weight, cost, and energy waste—making storage economics worse.

In all four cases, the constraint is not generation—it is conversion.

Vertical GaN is designed precisely for this gap.

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Key Technical Advantages of onsemi vGaN

✅ Up to 50% reduction in switching and conduction loss
✅ Operation at >1 MHz switching without thermal runaway
✅ Device size up to 3× smaller for same voltage/current rating
✅ Enables 2× smaller inductors and capacitors
✅ Built-in robustness against avalanche, surge and cosmic radiation
✅ Ideal for multi-kW to MW-scale conversion systems

One of the least discussed—but most important—advantages:
📌 Because passive components shrink dramatically at higher switching frequencies, vGaN reduces total system cost, not just device-level power loss.

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Application Impact by Sector

A common theme is emerging across industries:
→ vGaN replaces big, hot, slow power stages with compact, cool, fast ones.

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Competitive Positioning: Where vGaN Fits in the Market Map

The wide-bandgap power market is no longer a single race—it is now segmented:

Vertical GaN attacks exactly the zone where SiC is gaining momentum, but with:

• Higher switching speed

• Lower system size

• Lower passive BOM

• Better thermal density

onsemi is not replacing SiC—it is competing above and below it simultaneously.

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The Manufacturing Story: Why Location Matters

Unlike other GaN vendors relying on outsourced wafer fabs, onsemi's vGaN platform is:

🏭 Designed and manufactured in Syracuse, New York
🔬 Built on proprietary crystal and epitaxy processes
📜 Protected by more than 130 patents across multiple regions
🚗 Targeted for automotive-grade qualification (AEC-Q)

This means two things:

1. Secure supply chain for U.S. and EU markets

2. Faster scalability and reliability certification — a major advantage in EV and defense markets

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Market Impact: A 5-Year Outlook

Analysts from Yole, Omdia and TrendForce project:

📈 GaN power device market: $2.8B → $8.6B (2023–2028)
📈 High-voltage GaN specifically may capture 25–30% of SiC TAM
📈 Data center power conversion alone will exceed $4B annual component spend by 2030
📈 Every 1% efficiency gain at hyperscale level = $100M+ in annual energy savings

This explains why AI companies, EV OEMs and power supply manufacturers are already evaluating vGaN samples.

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The Strategic Message Behind the Launch

onsemi is not positioning vGaN as a “new product.”
It is positioning it as the next platform after SiC, with long-term implications:

🔹 Reduces system energy cost, not just device losses
🔹 Shrinks entire power stages, not only transistors
🔹 Enables electrification without scaling cooling, copper, and real estate costs
🔹 Turns wide-bandgap into a power-per-volume competition, not a transistor-per-wafer competition

In short:
🌍 “Efficiency is now infrastructure.”
And vertical GaN is designed for the era where watts per cubic centimeter is the new benchmark.

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Conclusion

Just as SiC reshaped EV drivetrains and power modules over the last decade, vertical GaN is now positioned to disrupt the next wave of electrification—where size, weight, thermal load, and switching speed matter as much as voltage rating.

The transition is already underway:

• AI power racks are demanding higher density

• Automakers are migrating to >800V platforms

• Energy systems are scaling past silicon limits

• Aerospace is eliminating every unnecessary gram

The semiconductor that wins this decade won’t just be fast or efficient, but small, cool, scalable, and voltage-capable.

And that is the problem vertical GaN was engineered to solve.