OSK2028A-IG is a part manufactured and sold by Optosupply, a leading designer and producer of optoelectronic components. It is a 2028A digital optocoupler, which is designed to isolate one electrical circuit from another without passing any DC current. It consists of a GaAs infrared light-emitting diode (LED) optically coupled to a silicon NPN phototransistor. The optocoupler provides 3,200 volts of electrical isolation, making it suitable for use in AC voltage applications. Additionally, the optocoupler allows for compatibility with a wide variety of sensors and output devices, as its package is no longer than 6.5mm. This makes it easy to install even in small spaces. The part comes with a high-speed switching time of 40 nanoseconds and low power dissipation of 0.5 watts. The optocoupler is also RoHS compliant, making it suitable for use in many industrial applications.