Hall-Effect Sensor - US1881 (Latching)

(1 review) Write a Review


The US1881 is an integrated Hall effect latching sensor. Similar to a reed sensor, simply hold a magnet near the sensor to toggle. This makes for a robust presence sensor and is a smaller, lower-cost option to a reed sensor. A hall effect sensor can also 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).

Hall Effect Sensor Features:

  • 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
  • Package: TO-92
  • RoHS Compliant

Hall Effect Sensor Functional Diagram:

Hall-Effect Sensor - US1881 (Latching) Functional Diagram


View AllClose

Additional Information

Part Number:
View AllClose

1 Review

  • 4
    Title of review 649

    Posted by Mike Milla on 7th Feb 2014

    Delivered promptly. Not tried them out yet so can't assess performance.

View AllClose