Maxim Integrated MAX22519 Digital Isolator

Maxim Integrated MAX22519 Digital Isolator is a dual-channel digital galvanic isolator with an integrated field-side supply. This digital isolator eliminates the bulky and expensive external isolated power supply when the power demand of the field side is small. The field-side power is supplied by the logic-side using an integrated isolated DC-DC converter. This digital isolator device is available with either push-pull or open-drain outputs and output default states are either logic-high or high impedance. The MAX22519 digital isolator features integrated isolated field-side supply, integrated galvanic digital isolation, integrated surge, and short protection with external. This MAX22519 digital isolator offers 24VAC of short protection, a compact 8-Pin wide-body SOIC package (5.5mm creepage), and 3.5kVRMS isolation voltage for the 60s (VISO). The digital isolator is ideally used in industrial IoT, industrial networking systems, building automation, and medical equipment.


  • Robust protection in a small footprint:
    • Integrated isolated field-side supply
    • Integrated galvanic digital isolation
    • Integrated surge and short protection with an external series resistor
  • Compact 8-pin wide-body SOIC package (5.5mm creepage)
  • Integrated surge and short protection with an external series resistor:
    • 24VAC short protection
    • ±1kV line-to-ground and ±2kV line-to-line surge tolerance (1.2/50μs waveform)


  • -40°C to 125°C operating temperature range
  • 3V to 5.5V of logic side supply
  • -60°C to 150°C of the storage temperature range
  • 150°C of maximum junction temperature
  • 2.7V to 4V of supply voltage
  • 3.5kVRMS of isolation voltage for the 60s (VISO)
  • 445VRMS of continuous working voltage (VIOWM)
  • 220μA of field-side supply external load capability

Block Diagram

Application Circuit

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