Diodes Incorporated

ZMZ20 (Obsolete)

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he ZMZ20 is an extremely sensitive magnetic field sensor in a 4 pin E-Line package employing the magneto-resistive effects of thin film Permalloy. It allows the measurement of magnetic fields or the detection of metallic parts. The sensor consists of a chip covered with Permalloy stripes which form a Wheatstone bridge, whose output voltage is proportional to the magnetic field component Hy. A perpendicular field Hx is necessary to suppress the hysteresis and this can be provided by using a small permanent magnet.


  • Output voltage proportional to magnetic field Hy
  • Adjustment of sensitivity and suppression of hysteresis by the auxiliary magnetic field Hx
  • Magnetic fields vertical to the chip level are not effective
  • Application(s)

  • Linear position sensors for process control, door interlocks, proximity detectors, machine tool sensing
  • Scalar measurement for compassing
  • Automotive - door switches, engine position and speed sensing
  • Metering of fluids by sensing rotation of impeller
  • Traffic counting and vehicle-type sensing
  • Measurement of current in a conductor without connection
  • Product Specifications

    Product Parameters

    Angular Accuracy -
    HY or HROT -
    Internal Magnet No
    Maximum Offset ±1
    Maximum Supply Voltage (V) 12
    Number of Sensors 1
    Operating Ambient Temperature (°C) -40 to 150
    Sensitivity (mv/V) 4.7/(kA/m)
    Typical Bridge Resistance 1.7
    Typical Output Voltage 20

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    Product Change Notices (PCNs)

    A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

    PCN # Issue Date Implementation Date Subject
    PCN-2311 2018-05-22 2018-11-22 Device End of Life (EOL)