This part is a kind of semiconductor called S9018.

Function of this product has NPN Transistor.

Manufacturers : Tuofeng Semiconductor

Image and pinout :

Some of the text within the PDF file :

Shenzhen Tuofeng Semiconductor Technology Co., Ltd TO-92 Plastic-Encapsulate Transistors S9018 TRANSISTOR (NPN) FEATURES z High Current Gain Bandwidth Product TO – 92 1.EMITTER 2.BASE 3.COLLECTOR MAXIMUM RATINGS (Ta=25℃ unless otherwise noted) Symbol VCBO VCEO VEBO IC PC RθJA Tj Tstg Parameter Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Collector Current -Continuous Collector Power Dissipation Thermal Resistance From Junction To Ambient Junction Temperature Storage Temperature Value 25 18 4 50 0.4 312.5 150 -55~+150 Unit V V V mA W ℃/W ℃ ℃ ELECTRICAL CHARACTERISTICS (Ta=25℃ unless otherwise specified) Parameter Collector-base breakdown voltage Collector-emitter breakdown voltage Emitter-base breakdown voltage Collector cut-off current Collect [ ... ]

S9018 PDF Datasheet Download