The A3144 (marked as 44E) is a high-speed, integrated Hall-effect switch. When a south-pole magnetic field is brought near the branded face of the sensor, the output pin drops to a low voltage (logic 0). Because it is a solid-state device, it can switch millions of times without failing, making it the perfect upgrade over traditional mechanical reed switches for industrial and hobbyist applications.
Key Features
Non-Contact Switching: No moving parts means no wear and tear, even in high-speed applications like motor tachometers.
Wide Voltage Range: Operates anywhere from 4.5V to 24V, making it compatible with Arduino, ESP32, and industrial PLC systems.
Open-Collector Output: Easily interfaces with any microcontroller logic level (3.3V or 5V) using a simple pull-up resistor.
Reverse Polarity Protection: Built-in protection to keep the sensor safe during accidental wiring mishaps.
High Frequency: Capable of detecting fast-moving magnets (up to 100kHz).
Technical Specifications
Feature
Specification
Model
A3144 / 44E / OH3144
Operating Voltage
4.5V to 24V DC
Output Current
25mA (Max)
Operating Temp
-40°C to 85°C
Package Type
TO-92 (3-pin transistor style)
Output Type
Digital (Open Collector)
Magnetic Polar
Unipolar (Detects South Pole)
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