Si8239x Isolated Gate Drivers

Si8239x isolators are ideal for driving power MOSFETs and IGBTs used in a wide variety of switched power and motor control applications. Based on our proprietary silicon isolation technology, Si8239x isolators provide high noise immunity, low prop delays and skew, reduced variation with temperature and age, and tight part-to-part matching. Si8239x devices support up to 5 kVRMS withstand voltages and combine two isolated drivers, with either an independent input control or a single input for high power applications. Si8239x isolators offer many distinct features, including an output UVLO fault detection, feedback, automatic shutdown for both drivers, an EN (active high) instead of a DIS (active low) pin, a safe delayed start-up time of 1 ms, fail-safe drivers with default low in case of VDDI power-down and highly precise dead time programmability. All drivers operate with a 2.5 V - 5.5 V input VDD and a maximum drive supply voltage of 24 V. 

Additional safety features
UVLO feedback
Peak output current
4 A

Common Specs

  • UVLO safety feature
    • UVLO status feedback to controller
    • Both drivers shutdown feature on UVLO fault
  • 1 ms safe start-up delay: Allows safe system start-up
  • EN (active high) instead of DIS for added safety
    • EN pin ESD circuit does not power up chip
  • 2.5 V VDDI capability
  • High CMTI: 100 kV/µs
  • Safety certified: UL, IEC/VDE, CSA, CQC


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Part Number Isolation Rating (kVrms) Peak Output Current (A) UVLO Voltage (V) Input Type Output Configuration Package Type Overlap Protection and Dead Time Control AEC-Q100 Temperature Range (°C) Driver Supply (V) Input Supply (V) Max Propagation Delay (ns) 10 kV Surge

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