AH3144E Unipolar Hall Effect Sensor - Digital Magnetic Switch IC, TO-92UA Package

The AH3144E is a digital unipolar Hall effect sensor IC designed for non-contact magnetic switching in automotive, industrial, and consumer electronic systems. It integrates a Hall-voltage generator, voltage regulator, temperature compensation circuit, signal amplifier, Schmitt trigger, and open-collector output driver on a single silicon chip, using a Bipolar process for reliable, stable operation. The sensor responds only to the S pole of a magnet: when the magnetic flux density at the marked surface reaches the operate point (BOP), the output switches to a low level; when the magnet moves away and the flux falls below the release point (BRP), the output returns to a high level. The N pole produces no response, which gives the device its unipolar switching characteristic. Its wide 4.5V to 24V supply range, 25mA rated sink current, and reverse-voltage protection make it suitable for direct interfacing with relays, PLC inputs, and microcontroller GPIO pins through a simple pull-up resistor. Typical operate and release points are 15 mT and 10 mT respectively, with 5 mT hysteresis for stable switching, and the response time of approximately 1 μs supports operating frequencies up to 100 kHz. This AH3144E Hall sensor is supplied in the TO-92UA through-hole package, making it practical for breadboards, prototyping boards, and production PCBs. Whether the application is BLDC motor commutation, rotor position sensing, speed measurement, or door and lock detection, this digital Hall sensor provides a robust, low-cost magnetic switch sensor solution with proven temperature stability across the full -40°C to +150°C range.

Application

1. BLDC motor commutation and rotor position feedback in electronic speed controllers.
2. Rotational speed measurement, tachometers, and gear-tooth sensing.
3. Automotive door, seat, and steering column position detection.
4. Water-flow sensing, magnetic encoders, and proximity switches.
5. Industrial end-of-travel limits, safety interlocks, and PLC input interfaces.

Specifications

1. Model: AH3144E
2. Sensor type: Digital unipolar Hall effect switch
3. Supply voltage (operating): 4.5V to 24V DC
4. Supply voltage (absolute limit): 3.5V to 28V DC
5. Supply current: 3.5mA typical, 8mA maximum
6. Output type: Open-collector, digital
7. Output sink current (rated): 25mA
8. Output sink current (maximum): 50mA
9. Output low voltage: 0.2V typical (at 25mA sink)
10. Output high voltage: 23.5V typical (at 24V supply)
11. Operate point (BOP): 15mT typical
12. Release point (BRP): 10mT typical
13. Hysteresis (BH): 5mT typical
14. Response time: approximately 1μs
15. Operating frequency: DC to 100kHz
16. Operating temperature: -40°C to +150°C
17. Storage temperature: -55°C to +175°C
18. Package: TO-92UA (through-hole, 3-pin)
19. Reverse-voltage protection: built-in
20. Compliance: RoHS, REACH