Hall-Effect Sensor - US1881 (Latching)

Item #: COM-09312
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Price: $2.13 inc GST
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    The US1881 is an integrated Hall-Effect latched sensor. That's nice but what does it do? Holding a magnet near the sensor will cause the output pin to toggle. This makes for a robust presence sensor. A reed sensor also works nicely, but can be limited by the glass encapsulation and size. A Hall-Effect sensor is much smaller, but can handle less current than a reed switch.

    The device includes an on-chip Hall voltage generator for magnetic sensing, a comparator that amplifies the Hall voltage, and a Schmitt trigger to provide switching hysteresis for noise rejection, and open-collector output. An internal bandgap regulator is used to provide temperature compensated supply voltage for internal circuits and allows a wide operating supply range.

    If a magnetic flux density larger than threshold Bop, DO is turned on (low). The output state is held until a magnetic flux density reversal falls below Brp causing DO to be turned off (high).


    • 3.5V to 24V DC operation voltage
    • Low current consumption
    • Temperature compensation
    • Wide operating voltage range
    • Open-Collector pre-driver
    • 50mA maximum sinking output current
    • Reverse polarity protection
    • Lead Free Package: TO-92