This part is a kind of semiconductor called 4744AP.

Function of this product has 1N4744AP.

Manufacturers : Microsemi Corporation

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Some of the text within the PDF file :

1N4728AP thru 1N4764AP (PLASTIC) Silicon 1 Watt Zener Diodes SCOTTSDALE DIVISION DESCRIPTION The popular 1N4728A thru 1N4764A series of 1.0 watt Zeners provides voltage regulation in a selection from 3.3 to 100 volts in 5% tolerances with other tolerances also available as identified by different suffix letters on the part number. These plastic encapsulated Zeners are moisture classified as Level 1 with no dry pack required and are also available in various military screening levels by adding a prefix identifier as also described in the Features section. Microsemi also offers numerous other Zener products to meet higher and lower power applications. APPEARANCE WWW . Microsemi . C OM DO-41 or DO-204AL (Plastic) IMPORTANT: For the most current da [ ... ]

4744AP PDF Datasheet Download