The BPC-1009 with Optocouplers SMD-4 RoHS manufactured by Bright LED is an electronic component designed for the purpose of isolating one circuit from another. It uses four optocouplers that are RoHS (Restriction of Hazardous Substances) certified and mounted on a surface mount device (SMD). This part is advantageous in preventing signals and noise from traveling between different circuits. It also serves to protect the circuits from overvoltage, signal level shifting, as well as providing signal isolation and noise reduction when dealing with high voltage. Additionally, the BPC-1009 has a wide common mode rejection ratio (CMRR) and wide temperature range, allowing it to be used in various applications.