Hall-Effect Sensor - US1881 (Latching)

Hall-Effect Sensor - US1881 (Latching)

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:

Documents:

• US1881EUA Datasheet