Hall Effect Sensor US1881EUA With Magnet

Description

This kit includes US1881 and a magnet.
The US1881 is an integrated Hall effect latched sensor.
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).
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
Lead Free Package: TO-92
Documents:
Specification of US1881
Specification of Magnet
Magnet Hysterisis
Magnet Test Report
Tutorial Wiki