Digital Hall Effect Sensor

The A3144 is a Unipolar Digital Hall Effect Sensor with three connections:
VCC (4.5-24V)
GND
OUTPUT (open-collector, requiring a pull-up resistor)

This sensor is typically in an 'off' state but switches 'on' when it detects the presence of a magnetic field from a specific polarity. Think of it as a switch that activates based on the proximity of a magnet. Specifically, it responds to the south side of a magnet when it’s close enough to the front of the sensor. However, if the north side of the magnet is applied to the back of the sensor, it can also activate.

The A3144 includes built-in hysteresis, ensuring stable activation and deactivation, which prevents false triggering due to minor magnetic fluctuations.

Digital Hall Effect Sensors like the A3144 are invaluable in applications requiring zero-friction detection. Common uses include detecting the trigger points on a rotating wheel to count rotations or measure speed, as well as in tachometers, brushless DC motor commutation, and proximity sensing.

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