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A3144 Hall effect Sensor

Pin Configuration


Pin Name



+5V (Vcc)

Used to power the hall sensor, typically +5V is used



Connect to the ground of the circuit



This pin goes high, if magnet detected. Output voltage is equal to Operating voltage.


Hall-effect sensor Specifications

  • Digital Output Hall-effect sensor
  • Operating voltage: 4.5V to 28V (typically 5V)
  • Output Current: 25mA
  • Can be used to detect both the poles of a magnet
  • Output voltage is equal to operating voltage
  • Operating temperature: -40°C to 85°C
  • Turn on and Turn off time is 2uS each
  • Inbuilt reverse polarity protection
  • Suitable for Automotive and Industrial Applications

Note: To know why these parameters are important read further. Also the A3144 hall effect sensor datasheet can be found at the bottom of the page


Alternative Digital Hall-effect Sensors

A3141, A3142, A3143, US1881, OH090U


Other Analog Hall-effect Sensors

A1321, A1302, SS495B, ASC712


Where to use hall-effect sensor

A hall-effect sensor as the name suggests works with the principle of hall-effect and is used to detect magnets. Each side of the sensor can detect one particular pole. It can also be easily interfaced with a microcontroller since it works on transistor logic.

So if you are looking for a sensor to detect magnet for measuring speed of a moving object or just to detect objects then this sensor might be the perfect choice for your project.


How to use Hall-effect sensor

There are two main types of hall-effect sensor, one which gives an analog output and the other which gives a digital output. A3144 is a digital output hall sensor, meaning if it detects a magnet the output will go low else the output will remain high. It is also mandatory to use a pull-up resistor as shown below to keep the output high when no magnet is detected.

 Circuit using A3144 Hall effect Sensor

In the above circuit diagram the resistor R1 (10K) is used as a pull-up resistor and the capacitor C1 (0.1uF) is used to filter any noise that might be coupled with the digital output.



  • Used to detect magnets(objects) in automation systems
  • Used in magnetic door alarm system
  • Measure speed in automobiles
  • Detect the pole of magnets in BLDC motors


2D Model of A3144 (Through hole)

 A3144 Hall effect Sensor 2D model

Component Datasheet

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