This part is a kind of semiconductor called MOC3010.

Function of this product has (MOC3010 - MOC3012) 6-Pin DIP Random-Phase Optoisolators Triac Driver Output.

Manufacturers : Motorola

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Some of the text within the PDF file :

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MOC3010/D GlobalOptoisolator™ 6-Pin DIP Random-Phase Optoisolators Triac Driver Output (250 Volts Peak) The MOC3010 Series consists of gallium arsenide infrared emitting diodes, optically coupled to silicon bilateral switch and are designed for applications requiring isolated triac triggering, low–current isolated ac switching, high electrical isolation (to 7500 Vac peak), high detector standoff voltage, small size, and low cost. • To order devices that are tested and marked per VDE 0884 requirements, the suffix ”V” must be included at end of part number. VDE 0884 is a test option. Recommended for 115 Vac(rms) Applications: • Solenoid/Valve Controls • Lamp Ballasts • Interfacing Microprocessors to 115 Vac Peri [ ... ]

MOC3010 PDF Datasheet Download