This part is a kind of semiconductor called SK310B.

Function of this product has (SK32B - SK310B) Surface Mount Schottky Barrier Rectifiers.

Manufacturers : Luguang Electronic

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Some of the text within the PDF file :

SK32B-SK310B Surface Mount Schottky Barrier Rectifiers REVERSE VOLTAGE: 20 - 100 V FORWARD CURRENT: 3.0 A SMB Features 4.7± 0.25 Schottky barrier rectifier 2.0± 0.15 3.6± 0.3 5.4± 0.2 1.3± 0.2 0.203MAX 0.2± 0.05 Guardring protection Low forward voltage Reverse energy tested High current capability Extremely low thermal resistance Mechanical Data Case: SMB molded plastic body 1111 Polarity: Color band denotes cathode end Mounting position: ANY Weight: 0.003 ounces, 0.093 gram 2.3± 0.15 Dimensions in millimeters MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS Ratings at 25oC ambient temperature unless otherwise specified SK32B SK33B SK34B SK35B SK36B SK38B SK39BSK310B UNITS Maximum repetitive peak reverse voltage Maximum RMS voltage Maximum DC blocking voltage Maximum average [ ... ]

SK310B PDF Datasheet Download