This part is a kind of semiconductor called AD1117-xx.
Function of this product has 1A Low Dropout Regulator SCSI-II Acrive Treminator.
Manufacturers : Advanced
Image and pinout :

Some of the text within the PDF file :
www.DataSheet.co.kr Advanced AD1117-XX 1A Low Dropout Regulator SCSI-II Active Terminator FEATURES • Guaranteed 1A Output • Three Terminal Adjustable Or Fixed 1.5V, 2.5V, 2.85V, 3V, 3.3V & 5V • Very Low Quiescent Current • Low Dropout Voltage Of 1.2 Volts At Full Load • Extremely Tight Load And Line Regulation • Very Low Temperature Coefficient • Fixed 2.85V Device For SCSI-II Active Terminator • Logic-Controlled Electronic Shutdown • Surface Mount Package SOT-223, TO-252, TO-220, SOT-89, TO-263, & SO-8 APPLICATIONS • SCSI-II Active Terminator • Portable/ Palm Top / Notebook Computers • Battery Chargers • Disk Drives • Portable Consumer Equipment • Portable Instrumentation • SMPS Post-Regulator PRODUCT DESCRIPTION The ADVANCED Semiconductor AD1117 is a lo [ ... ]
AD1117-xx PDF Datasheet Download
