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STMicroelectronics STGAP4S Isolated Gate Driver for IGBTs and SiC MOSFETs

Featuring its unique output architecture

The STMicroelectronics STGAP4S is a galvanically isolated single gate driver for IGBTs and SiC MOSFETs with advanced protection, configuration and diagnostic features. The architecture of the STGAP4S isolates the channel gate driving from the control and the low voltage interface circuitry through true galvanic isolation.

The unique output architecture of these gate drivers is designed to allow the use of an external MOSFET push-pull stage giving flexibility in terms of current capability dimensioning and easing the use of several power switches in parallel. The 2 pre-driver outputs are characterized by current capability and output voltage swing optimized for that topology and allow the use of a negative gate driving supply. The integrated controller for isolated flyback power supply allows to generate positive and negative gate driver supply voltages with few external components, enabling PCB space saving.

Protection functions such as the Miller clamp driver, desaturation and overcurrent detection, UVLO and OVLO are included on the STGAP4S to easily design high reliability systems.

A temperature sensor is also integrated in the STGAP4S driver by STMicroelectronics. Open drain diagnostic outputs are present and detailed device conditions can be monitored through the SPI.

Each function’s parameter can be programmed via the SPI, making the device very flexible and allowing it to fit in a wide range of applications.


  • AEC-Q100 qualified
  • High voltage rail up to 1200 V
  • Two output pins for direct driving of external MOSFET buffer
  • Driver current capability:
    • OUT1: 0.6/2.5 A sink/source
    • OUT2: 2.4/0.6 A sink/source
  • Negative gate drive ability
  • dV/dt transient immunity ±100 V/ns in full temperature range
  • Integrated controller for isolated flyback power supply
  • Active Miller clamp driver for external N‑channel MOSFET
  • Programmable Desaturation detection


  • Programmable Overcurrent detection
  • Soft turn-off
  • VCE active clamp
  • Two diagnostic status outputs
  • Programmable UVLO and OVLO on each supply
  • Programmable input deglitch filter
  • Asynchronous stop command
  • Isolated 8-bit A/D converter
  • Integrated temperature sensor
  • Programmable deadtime, with violation error
  • SPI interface for parameters programming and extended diagnostic
  • Temperature warning and shutdown protection
  • Self-diagnostic routines for protection features


  • Inverters for EV/HEV
  • 600/1200 V industrial inverters
  • EV charging stations
  • UPS equipment


  • AC/AC converters
  • DC/DC converters
  • Solar inverters