The DPC-817C with Optocouplers DIP-4 RoHS is a 4-pin optocoupler manufactured by Micro One. It is an RoHS compliant component, meaning it is made from lead-free materials and is free of hazardous substances. This device is used to provide electrical isolation between two circuits, such as a low voltage control circuit and a high voltage power circuit. The optocoupler consists of two components, an LED and a photodiode, that are optically coupled together. The LED transmits a signal, which is then received by the photodiode and converted into an electrical signal. This makes the optocoupler an effective solution for protecting sensitive circuits from overvoltage, noise, and electrical interference. Additionally, the DPC-817C is compact and affordable, making it a great choice for a range of applications.