This part is a kind of semiconductor called SS8550.

Function of this product has Silicon Epitaxial Planar Transistor.

Manufacturers : Galaxy Semi-Conductor

Image and pinout :

Some of the text within the PDF file :

BL Galaxy Electrical Silicon Epitaxial Planar Transistor FEATURES z z z Collector Current.(IC= 1.5A） Complementary To SS8550. Collector Dissipation: PC=0.3W (TC=25°C) Production specification SS8550 Pb Lead-free APPLICATIONS z High Collector Current. SOT-23 ORDERING INFORMATION Type No. SS8550 Marking Y2 Package Code SOT-23 MAXIMUM RATING @ Ta=25℃ unless otherwise specified Symbol VCBO VCEO VEBO IC PC Tj,Tstg Parameter Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Collector Current -Continuous Collector Dissipation Junction and Storage Temperature Value -40 -25 -5 -1.5 0.3 -55~150 Units V V V A W ℃ Document number: BL/SSSTC087 Rev.A www.galaxycn.com 1 BL Galaxy Electrical Silicon Epitaxial Planar Transistor ELECTRICAL CHARACTERIS [ ... ]

SS8550 PDF Datasheet Download