The A3144 is a unipolar digital Hall Effect sensor that acts as a magnetic switch. It detects a magnetic South pole and outputs a digital signal.Core Specifications

• Voltage: 4.5V to 24V DC.
• Output: Active LOW (0V when a magnet is detected).
• Type: Open-collector (requires a 10k pull-up resistor).

Pinout (Flat Face Front, Left to Right)

1. VCC: Power input.
2. GND: Ground connection.
3. OUT: Digital output signal.

Uses

• RPM counters.
• Speedometers.
• Door safety switches.
• CNC limit switches.