This part is a kind of semiconductor called MOC3083M.
Function of this product has (MOC3081M - MOC3083M) 6-Pin DIP Zero-C Cross Optoisolators Triac Driver Output.
Manufacturers : Fairchild Semiconductor
Image and pinout :

Some of the text within the PDF file :
6-PIN DIP ZERO-CROSS OPTOISOLATORS TRIAC DRIVER OUTPUT (800 VOLT PEAK) MOC3081M PACKAGE MOC3082M MOC3083M SCHEMATIC ANODE 1 6 MAIN TERM. CATHODE 2 5 NC* N/C 3 ZERO CROSSING CIRCUIT *DO NOT CONNECT (TRIAC SUBSTRATE) 4 MAIN TERM. DESCRIPTION The MOC3081M, MOC3082M and MOC3083M devices consist of a GaAs infrared emitting diode optically coupled to a monolithic silicon detector performing the function of a zero voltage crossing bilateral triac driver. They are designed for use with a discrete power triac in the interface of logic systems to equipment powered from 240 VAC lines, such as solid-state relays, industrial controls, motors, solenoids and consumer appliances, etc. FEATURES • • • • • • Underwriters Laboratories (UL) reco [ ... ]
MOC3083M PDF Datasheet Download
