Marking SMD, SMD Codes 2U.

Datasheets KST63, MMBTA63.
SMD CodePackageDevice NameManufacturerDataDatasheet
2USOT-23KST63FairchildPNP Epitaxial Silicon TransistorDownload datasheet
2USOT-23MMBTA63GalaxyPNP General Purpose TransistorDownload datasheet