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onsemi GaNEXUS GaN Power Portfolio: What Engineers Should Check Before Design-In
onsemi GaNEXUS GaN Power Portfolio: What Engineers Should Check Before Design-In
onsemi has introduced the GaNEXUS gallium nitride power portfolio for designs that need higher power density and better conversion efficiency. The launch matters most where power conversion is becoming smaller, hotter, and more tightly coupled to compute loads, including AI data centers, robotics, industrial power shelves, and energy infrastructure.
The key point is not simply that GaN is faster than silicon. A GaN device changes the design tradeoff around switching frequency, magnetics size, thermal path, gate-drive behavior, and layout parasitics. A design that treats a GaN FET as a drop-in MOSFET replacement can lose much of the benefit or create validation problems later.
What onsemi announced
The company describes GaNEXUS as a new power portfolio covering 40 V to 650 V devices. The first group includes a 650 V Smart GaN FET aimed at applications that need compact high-efficiency conversion. onsemi positions the portfolio around AI data center power, robotics, and energy infrastructure, where conversion losses and board area both become expensive.
For an engineering team, the announcement is worth tracking because it gives another supplier route for GaN-based power stages. The useful question is whether the device family can reduce conduction and switching loss in the target topology while keeping layout, EMI, protection, and sourcing risk under control.
Where the device family fits
GaN power devices are strongest when the system can use fast switching to shrink passive components or improve efficiency at high frequency. This can be relevant in front-end power supplies, intermediate bus conversion, compact adapters, motor and actuator power stages, and high-density embedded power rails.
In AI and edge-compute hardware, the pressure usually comes from three places: load transients, thermal density, and mechanical limits around airflow and board area. A GaN stage may help, but only when the surrounding magnetics, capacitors, controller, isolation, and thermal stack are selected as one system.
Design checks before choosing GaNEXUS
| Check area | Why it matters | What to verify |
|---|---|---|
| Voltage class | The portfolio spans low-voltage and high-voltage use cases. | Confirm 40 V, 650 V, or another family member against bus voltage, derating, surge, and isolation requirements. |
| Gate drive and protection | GaN switching behavior is sensitive to drive conditions and layout. | Review recommended driver, UVLO behavior, transient immunity, and any integrated protection in the Smart GaN FET. |
| Thermal path | Higher density moves more heat through a smaller footprint. | Check package thermal resistance, copper area, airflow, heat spreader path, and worst-case ambient profile. |
| EMI and layout | Fast edges make parasitic inductance visible. | Keep the power loop compact, control gate loop impedance, and validate emissions early on a real board. |
| Qualification path | Power devices often stay in production for many years. | Check package, lifecycle status, reliability data, and second-source or redesign options before freezing the BOM. |
How this changes the BOM discussion
A GaN selection should not be approved only because the headline efficiency is attractive. The purchasing and engineering review should compare the full power stage: FET or integrated device, controller, driver, magnetic component, snubber strategy, current sensing, protection, thermal hardware, and layout constraints.
If the current design already struggles with inductor size, heat rise, or airflow, GaNEXUS may be a useful device family to evaluate. If the limiting factor is control-loop stability, mechanical spacing, isolation margin, or certification timing, the team should treat the GaN option as a board-level redesign rather than a late component swap.
Related In-Fortune reading
- Powering an AI board so it rides through sudden load
- Doing solid power conversion for a connected device
Source and procurement note
The manufacturer announcement is here: onsemi GaNEXUS GaN power portfolio release. Before using the family in a design, confirm the exact orderable part number, datasheet revision, package, reliability data, and evaluation-board documentation with the manufacturer or an authorized channel.
