Gallium Nitride (GaN) belongs to the family of wide bandgap (WBG) materials. It is a binary compound whose molecule is formed from one atom of Gallium (III-group, Z=31) and one of Nitrogen (V-group, Z=7) with a wurztite hexagonal structure.

Gallium Nitride (GaN)


Gallium Nitride (GaN) properties


ST’s GaN HEMTs (High Electron Mobility Transistors) represent a major step forward in power electronics providing high-frequency operation, with increased efficiency and higher power density compared to silicon based transistors.

AlGaN/GaN High Electron Mobility Transistor (HEMT)

AlGaN/GaN High Electron Mobility Transistor (HEMT)


  • Low Ron due to high two-dimensional electron gas (2DEG) density with ns ~ 9x1012 cm-2
  • High breakdown voltage linked to high bandgap (3.4eV)
  • Low capacitance: no junction to deplete


  • Better on-resistance than Si with higher operation frequency (due to high mobility)
  • Bi-directionality (advantageous in some circuit topologies)
  • Lateral device (suitable for integration of power with control circuitry)

GaN devices allow gate charge reduction without sacrificing on-resistance, leading to power savings and total system downsizing

GaN devices allow gate charge reduction without sacrificing on-resistance

ST and GaN

ST started working on wide bandgap materials (WBG) in 1996 with SiC MOSFETs and SiC diodes and has become one of the main players in the market. We are now expanding our portfolio of wide bandgap power products with the 650V & 100V normally-off GaN High-electron-mobility transistor (HEMT) devices.

ST GaN products will address a wide variety of applications such as adaptors (PC, portable electronics, wall USB chargers, wireless chargers), power factor correction (PFC) servers and DC/DC converters in segments as diverse as space and avionics, telecom and industrial.

Future developments of GaN products will target the automotive environment including on-board chargers for EV and mild-hybrid DC-DC converters.

For technology status and product availability, please contact your local ST Sales Office

ST and GaN