The VOT8024AB with Triac & SCR Output Optocouplers PhotoTRIAC 800V ZC SMD4 manufactured by Vishay is an opto-isolator that uses a light-emitting diode (LED) and a phototransistor to provide galvanic isolation between two circuits. It uses Triac & SCR output for switching and control. Its very compact surface mount package (SMD4) and zero-cross technology make it suitable for devices that require fast response, high switching speed, and low power consumption. It also has a load current of 1 A and an isolation voltage of 5300 V AC (1 minute) making it an ideal solution for protecting circuits and signal transmission in high voltage circuits.