A1344EUA-T High Sensitivity 44E Hall Effect Sensor Switch – Import Chip (402 Package)

Description

The A1344EUA-T (44E) is a unipolar digital Hall effect sensor switch designed for non-contact magnetic field detection. It integrates a Hall voltage generator, voltage regulator, differential amplifier, Schmitt trigger, and open-collector NPN output in a single 3-pin package . The sensor triggers when the South pole of a magnet approaches the marked face, pulling the output LOW; when the magnet is removed, the output returns HIGH via an external pull-up resistor .

The device is widely used as a drop-in replacement for the A3144 series, offering similar functionality for speed sensing, position detection, and proximity switching . It operates from 4.5V to 24V (some sources list 3.3–24V) and handles -40°C to +150°C, making it suitable for automotive and industrial environments .

Critical limitations: The output is open-collector, requiring a pull-up resistor (internal or external 10kΩ). The sensor is unipolar—it responds to the South pole only; the North pole does not trigger it . Do not confuse this with the genuine Allegro A1344, which is a bipolar SOT-23 part with different specifications .

Features

• Unipolar Operation: Triggers on South magnetic pole; releases when the magnet is removed .

• Open-Collector NPN Output: Sinks up to 25mA; requires a pull-up resistor .

• Wide Supply Voltage (4.5–24V): Compatible with 5V and 12V systems .

• Wide Temperature Range (-40°C to +150°C): Suitable for automotive and industrial use .

• Fast Switching: No contact bounce; suitable for RPM and pulse counting .

• Reverse Polarity Protection: Built-in protection against supply reversal .

• A3144-Compatible: Functions as a replacement for the widely used A3144 series .

• 3-Pin Through-Hole Package: TO-92 style for easy breadboard and PCB mounting .

Technical Specifications