Honeywell SS360PT Latching Hall Effect Sensor SOT-23 - 5 G to 55 G, 3-24V

A latching Hall sensor, like the SS360PT, requires both a South pole magnetic field to switch ON and a North pole field to switch OFF, providing stable position memory. A unipolar sensor only responds to one pole's presence and releases when that field is removed, making latching types ideal for precise bidirectional position or speed sensing.

The SS360PT's open-collector output can sink up to 20 mA continuously. This is sufficient to drive an LED directly or interface with most microcontroller input pins and opto-isolators without requiring an additional buffer transistor.

Connect Vdd to a 3V to 24V supply, GND to ground, and the open-collector Output pin to your microcontroller's digital input pin through a pull-up resistor (typically 1kΩ to 10kΩ to the MCU's logic voltage). The sensor's internal pull-up is designed for the supply voltage, so an external resistor to the MCU's logic level is recommended for reliable logic-high signals.

Yes, the SS360PT is well-suited for speed and RPM sensing. By mounting a small magnet on the rotating shaft and positioning the sensor nearby, each revolution will generate a precise digital pulse as the magnet's South and North poles pass by, which can be counted by a timer/counter input on a microcontroller or PLC.