Maxim Integrated MAX22519 Digital Isolator

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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Mike is the founder and editor of, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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