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Low Offset Current Monitor

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The ZXCT1020 is a precision high-side current sense monitor. Using this type of deviceeliminates the need to disrupt the ground plane when sensing a load current. The ZXCT1020 uses two external resistors to set the overall voltage gain for applications where improved accuracy at small sense voltages is required. For fixed gain variants Zetex offers the ZXCT1021 (G=10) and ZXCT1022 (G=100). The ZXCT1020 footprint follows that of the ZXCT1021/2 with only 2 additional resistors required: One resistor between pins 1 and 4 for setting transconductance, and the other betweenpins 3 and 2 for setting overall gain. Current output enables the user to set the gain via these external resistors. Using two externalresistors to set the gain ensures optimal versatility as the transconductance can be varied to meet the output impedance requirements of the load that the ZXCT1020 has to drive. The very low offset voltage enables a typical accuracy of 3% for sense voltages of only 10mV,giving better tolerances for small sense resistors necessary at higher currents. The wide input voltage range of 20V down to as low as 2.5V make it suitable for a range of applications. With a minimum operating current of just 25µA, combined with its SOT25 package make it suitable for portable battery equipment too.


  • Battery chargers
  • Over-current monitor
  • Motherboard power supply current measurement
  • Level translating
  • Programmable current source


  • Accurate high-side current sensing
  • Versatile current output scaling
  • 2.5V - 20V operating range
  • 25μA quiescent current
  • 1% typical accuracy
  • SOT25 package
  • Product Specifications

    Product Parameters

    Qualified to AECQ10x -
    Compliance (Only Automotive supports PPAP) -
    % Accuracy @ VSENSE =100mV Ta  0.02 %
    Quiescent Current 25 µA
    Gain Output/VSENSE -
    Bandwidth typ 3 MHz
    Operating Ambient Temperature Range -40 to 125 °C
    Special Features Ground Pin + External Trans Conductance Resistor + Extended Temp Range

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    Orderable Part Number Buy from Distributor / Contact Sales Request Samples


    Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
    Arrow Electronics Central EU 3000 4/18/2021 Europe Buy Now
    Avnet 3000 4/18/2021 United States Buy Now
    Mouser Electronics Inc. 707 4/18/2021 South America, North America, Asia, Europe, Middle East Buy Now
    RS Components Ltd. 1750 4/18/2021 Japan Buy Now
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