MicroSystemsThe A3212EUA-T is an ultra-mini Supplemental Insertion Package (SIP) Hall-effect sensor ic manufactured by Allegro MicroSystems. It has a low-field sensitivity with a response of 1 mA at a field strength of 2.75 Volts, and provides a digital output while using only a single power supply. The device is able to accurately detect a low magnetic field level in the presence of a strong magnetic field, making it ideal for use in precision applications such as proximity sensing, angular gear-tooth sensing, 2D and 3D magnetic fields, and air-gap measurement. The device is also designed for superior temperature and noise immunity, as well as simplified system-level design and testing. This part has a 3-pin SIP package, with pin 1 as the ground pin, pin 2 the power (VCC) supply pin, and pin 3 the output pin.