This part is a kind of semiconductor called 2SC1815-BL.

Function of this product has NPN Silicon Epitaxial Transistor.

Manufacturers : MCC

Image and pinout :

Some of the text within the PDF file :

MCC Micro Commercial Components TM
  omponents 20736 Marilla Street Chatsworth    !"# $ %    !"# 2SC1815-O 2SC1815-Y 2SC1815-GR 2SC1815-BL NPN Silicon Epitaxial Transistor TO-92 A E Features • • • • • 2SC1815 is NPN Silicon Epitaxial Transistor Designed for RF, AF Amplifier and General Purpose Applications. Capable of 0.4Watts of Power Dissipation. Collector-current 0.15A Collector-base Voltage 60V Marking : C1815 x • • • Epoxy meets UL 94 V-0 flammability rating Moisure Sensitivity Level 1 Lead Free Finish/Rohs Compliant ("P"Suffix designates RoHS Compliant. See ordering information) Operating and storage junction temperature range:-55oC to +125oC Electrical Characteristics @ 25OC Unless Otherwise Specified Symbo [ ... ]

2SC1815-BL PDF Datasheet Download