A3144 Hall Effect Sensor

Linear Hall-effect sensor is designed as a compact-sized, versatile linear Hall-effect device operated by the magnetic field from a permanent magnet or an electromagnet. A Hall effect sensor is a transducer that varies its output voltage proportional to the strength of the magnetic field. The integrated circuitry features low noise output, thereby making it unnecessary to use external filtering. The thin-film resistors present on the sensor module provide increased temperature stability and hence provide better accuracy. Thus these Hall-effect sensors offer a wide range of applications in proximity switching, positioning, speed detection, and current sensing applications. In short, it is simply a sensor that operates as an analogue transducer, directly returning a voltage.

A3144 is defined as a digital output hall sensor, meaning if it detects a magnet the output will go low else the output will remain high. Highly recommended to use a pull-up resistor to keep the output high when no magnet is detected. Each device includes a voltage regulator for operation with supply voltages of 4.5 to 24 volts, reverse battery protection diode, quadratic Hall-voltage generator, temperature compensation circuitry, small-signal amplifier, Schmitt trigger, and an open-collector output to sink up to 25 mA. With suitable output pull up, they can be used with bipolar or CMOS logic circuits.

Meanwhile, small geometries of the BiCMOS process allow manufacturing of these sensor modules in ultra-small packages. Moreover, each package is protected by lead (Pb) free, with 100% material tin-plated lead frames. The linear Hall sensor operates at a temperature range of -40 °C to 85 °C, thus making it ideal for commercial, consumer, and industrial environments.

Applications:

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