This part is a kind of semiconductor called A3423.

Function of this product has Dual Channel Hall Effect Direction Detection Sensor IC.

Manufacturers : Allegro

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Some of the text within the PDF file :

A3423 Dual Channel Hall Effect Direction Detection Sensor IC This device is in production, however, it has been deemed Pre-End of Life. The product is approaching end of life. Within a minimum of 6 months, the device will enter its final, Last Time Buy, order phase. Date of status change: June 3, 2013 Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer to the A1233. NOTE: For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. Allegro MicroSystems, LLC reserves the right to make, from time to time, revisions to the anticipated product life cycle plan for a product to accommodate changes in production capabilities, alternative product availabilities, or ma [ ... ]

A3423 PDF Datasheet Download