A3281ELT-T

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A3281ELT-T is a kind of magnetic sensor - switch (solid state) developed by Allegro MicroSystems. As a Hall-effect based device, it contains an integrated Hall voltage generator for magnetic sensing, a comparator that amplifies the Hall voltage, and a Schmitt trigger to provide switching hysteresis for noise rejection and more precise threshold switching.

Generally, this type of switch is used in many kinds of application, such as industrial automation, motion control, consumer electronics, automotive, and so on. The application fields mainly contain two types: linear and rotary. In automotive motion control, such as vehicle speed sensing, RPM speed meter, cruise control and electronic governor, the A3281ELT-T is ideal. It can be used in most motion control type application which have maximum speed up to 120km/h. As for industrial automation and consumer electronics, the switch is generally used in motor control and position control application.

The working principle of A3281ELT-T is very simple for the mean of its Hall effect. When the magnetic field near the switch change, an output voltage will be generated and amplified by a comparator. If the amplified voltage exceeds the two reference voltages, the output state of the switch will change. The Schmitt Trigger of magnemometer provides a hysteresis loop for a better noise rejection and a more precise threshold switching because the output state of the switch will not be changed once the inputs is back into the hysteresis loop.

The A3281ELT-T has many other advantages, such as low power characteristics, short-circuit protection, low operating current, and so on. Its linearity is up to 99%. It provides a great solution for any application that requires a reliable performance in magnetic field sensing. The low power design makes it suitable for a wide variety of automotive, motion control, and marketing automation applications.

In conclusion, the A3281ELT-T magnetic switch (solid state) is a popular choice for many kinds of application for its reliable performance, fast response time, and low power characteristics. The application fields mainly contain automotive motion control, industrial automation, and consumer electronics. The working principles of this switch is based on Hall effect and the Schmitt Trigger, which can provide a hysteresis loop for a better noise rejection and a more precise threshold switching.

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