A3144E 44E Unipolar Hall Sensor Element SOT23

Description

A3144E 44E Unipolar Hall Sensor Element SOT23

Description

The A3144E (often just marked as “44E”) is a unipolar Hall-effect switch designed to detect the presence of a magnetic field. It operates as a digital switch – the output goes LOW when a magnetic field of sufficient strength (South pole) is applied, and returns HIGH when the field is removed.

It is widely used in speed detection, position sensing, brushless DC motor commutation, and simple magnetic switches.

Specifications

• Type: Unipolar Hall Effect Switch

• Package: SOT-23 (also available in TO-92)

• Operating Voltage (Vcc): 3.5V – 24V (typical 5V or 12V)

• Output Type: Open Collector (requires pull-up resistor)

• Output Current (I_OUT): 25 mA max sink

• Output State:

  • LOW (active) when magnetic field (South pole) is present

  • HIGH (inactive) when field is removed

• Magnetic Operating Point (B_OP): ~30 – 50 mT (300 – 500 Gauss)

• Magnetic Release Point (B_RP): ~10 – 30 mT (100 – 300 Gauss)

• Hysteresis: ~15 mT typical (prevents false triggering)

• Switching Frequency: up to 10 kHz

• Power Consumption: ~4 mA (typical at 5V)

• Temperature Range: –40 °C to +85 °C

Key Features

• Unipolar (detects only South pole)

• Wide supply voltage (3.5V to 24V)

• Digital open-collector output for easy MCU interface

• Fast response (up to 10 kHz switching)

• Low power consumption (~4 mA)

• Compact SOT-23 package for space-constrained designs

Applications

• Brushless DC motor commutation

• Magnetic proximity switches

• Position & speed sensing (fans, wheels, robotics)

• Limit switches

• Magnetic encoder modules

• DIY magnetic switches and counters

⚡ The A3144E / 44E is one of the most popular Hall sensors used in Arduino and DIY projects.