This part is a kind of semiconductor called ST8050.

Function of this product has NPN Silicon Epitaxial Planar Transistor.

Manufacturers : SEMTECH ELECTRONICS

Image and pinout :

Some of the text within the PDF file :

ST 8050 (1.5A) NPN Silicon Epitaxial Planar Transistor for switching and amplifier applications. Especially suitable for AF-driver stages and low power output stages. On special request, these transistors can be manufactured in different pin configurations. 1.Emitter 2.Base 3.Collector TO-92 Plastic Package Weight approx. 019g Absolute Maximum Ratings (Ta = 25 OC) Parameter Collector Base Voltage Collector Emitter Voltage Emitter Base Voltage Collector Current Power Dissipation Junction Temperature Storage Temperature Range Symbol VCBO VCEO VEBO IC Ptot Tj TS Value 40 25 6 1.5 1 150 - 55 to + 150 Unit V V V A W O C C O Characteristics at Ta = 25 OC Parameter DC Current Gain at VCE = 1 V, IC = 5 mA at VCE = 1 V, IC = 100 mA at VCE = 1 V, IC = 800 mA Collector Cut [ ... ]

ST8050 PDF Datasheet Download