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A3144 Hall Effect Sensor — Unipolar Magnetic Switch
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A3144 Hall Effect Sensor — Unipolar Magnetic Switch
The A3144 is one of the most popular unipolar Hall Effect sensors, widely used in Arduino and embedded projects across Pakistan. It switches ON in the presence of a South magnetic pole and turns OFF when the field is removed. Its robust open-collector output and wide voltage range make it a go-to choice for RPM measurement, proximity detection, and motor control.
Technical Specifications
| Parameter | Value |
|---|---|
| Supply Voltage (Vcc) | 4.5V – 24V DC |
| Output Type | Open-Collector (Active Low) |
| Operate Point (BOP) | ~170 Gauss (typical) |
| Release Point (BRP) | ~75 Gauss (typical) |
| Output Current (Sink) | 25 mA max |
| Operating Temperature | -40°C to +85°C |
| Package | TO-92 (3-pin) |
| Sensing Type | Unipolar (South pole only) |
Pinout
| Pin | Name | Description |
|---|---|---|
| 1 | VCC | Supply Voltage (4.5V – 24V) |
| 2 | GND | Ground |
| 3 | OUT | Open-Collector Output (Active Low) |
Key Features
- Unipolar operation — activates with South pole magnetic field only
- Open-collector output — requires external pull-up resistor (typically 10kΩ)
- Wide supply voltage: 4.5V to 24V — works with 5V and 12V systems
- TO-92 package — same footprint as common transistors
- Compatible with Arduino, STM32, PIC, ESP32, Raspberry Pi
Applications
- RPM and speed measurement (bicycle, motor, fan)
- Proximity and position detection
- Brushless DC motor commutation
- Anti-lock braking system (ABS) sensing
- Industrial automation and robotics