Diodes Incorporated

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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.


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

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

    Product Parameters

    Compliance (Only Automotive supports PPAP) Standard
    AEC Qualified No
    Type Current Output
    Minimum S+ Common-Mode Sense Voltage (V) VB
    Minimum VCC/VB Supply Voltage (V) 2.7
    Maximum VCC/VB Supply Voltage (V) 20
    Sense Voltage VMAX (mV) -
    Maximum Output Voltage (V) Vs- -1
    Voltage output Gain VOUT/VSENSE (V/V) -
    Current output Gain Iout/VSENSE (mA/V) Ext resistor
    % Accuracy @ VSENSE =100mV Ta (%) 2
    Quiescent Current (µA) 25
    IS- S- Input current (nA) 20
    Bandwidth typ (MHz) 3
    Operating Ambient Temperature Range (°C) -40 to 125
    Special Features Ground Pin + External Trans Conductance Resistor + Extended Temp Range

    Related Content


    Technical Documents

    Application Notes

    ICP Reports


    Evaluation Boards and User Guides

    Recommended Soldering Techniques


    Diodes Incorporated's current monitors are high-performance, high-side/power rail current measurement ICs. They greatly simplify the measurement of load currents without disturbing the ground plane/reference point.

    The current monitor families contain variants with quiescent currents as low as 3µA, and others with operating voltages up to 60V, proving solutions for overcurrent detection in consumer, industrial, and automotive applications. The portfolio includes current output variants which via an external resistor to ground to provide adjustable gain, and voltage output variants with fixed gains.

    Automotive-compliant variants are available which are qualified to AEC-Q100 Grade 1 in IATF 16949 facilities supporting PPAP documentation.

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