This part is a kind of semiconductor called UGN3132.

Function of this product has (UGN3132 / UGN3133) ULTRA-SENSITIVE BIPOLAR HALL-EFFECT SWITCHES.

Manufacturers : Allegro MicroSystems

Image and pinout :

Some of the text within the PDF file :

3132 AND 3133 ULTRA-SENSITIVE BIPOLAR HALL-EFFECT SWITCHES These Hall-effect switches are designed for magnetic actuation using a bipolar magnetic field, i.e., a north-south alternating field. They combine extreme magnetic sensitivity with excellent stability over varying temperature and supply voltage. The high sensitivity permits their use with multi-pole ring magnets over relatively large distances. Each device includes a voltage regulator, quadratic Hall voltage generator, temperature stability circuit, signal amplifier, Schmitt trigger, and open-collector output on a single silicon chip. The on-board regulator permits operation with supply voltages of 4.5 to 24 V. The switch output can sink up to 25 mA. With suitable output pull up, they can be used directly with bipolar or MOS logic [ ... ]

UGN3132 PDF Datasheet Download