IT809 - Micro-Power Voltage Detector


The IT809 is a micro-power voltage detector supervising the power supply voltage level for microprocessors (μP) or digital systems. It provides internally fixed threshold levels with 2.67V, 3.0V, 3.3V and 4V which cover most digital applications. It features low supply current of 10μA. The IT809 performs supervisory function by sending out a reset signal whenever the VDD voltage falls below a preset threshold level. This reset signal will last the whole period before VDD recovering. Once VDD recovered upcrossing the threshold level, the reset signal will be released after a certain delay time. IT809 is provided in SOT-23-3 packages.


  • Internally Fixed Threshold 2.67V

  • High Accuracy +/-2%

  • Low Supply Current 10μA

  • No External Components Required

  • Quick Reset within 15μs

  • Built-in Recovery Delay 260ms

  • Low Functional Supply Voltage 1.3V

  • CMOS Push-Pull Output

  • Small SOT-23-3 Packages

  • RoHS Compliant and 100% Lead (Pb)-Free



Technology Information:

  Data Sheet

  Package: SOT233


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