This part is a kind of semiconductor called BC337-16.
Function of this product has NPN general purpose transistor.
Manufacturers : NXP
Image and pinout :

Some of the text within the PDF file :
BC817; BC817W; BC337 45 V, 500 mA NPN general-purpose transistors Rev. 06 17 November 2009 Product data sheet 1. Product profile 1.1 General description NPN general-purpose transistors. Table 1. Product overview Type number Package NXP BC817 SOT23 BC817W SOT323 BC337[1] SOT54 (TO-92) JEITA SC-70 SC-43A [1] Also available in SOT54A and SOT54 variant packages (see Section 2). PNP complement BC807 BC807W BC327 1.2 Features High current Low voltage 1.3 Applications General-purpose switching and amplification 1.4 Quick reference data Table 2. Symbol VCEO IC ICM hFE Quick reference data Parameter Conditions collector-emitter voltage collector current (DC) open base; IC = 10 mA peak collector current DC current gain BC817; BC817W; BC337 IC = 100 mA; VCE [ ... ]
BC337 PDF Datasheet Download
