The SD8666QS is a high voltage AC-DC controller and regulator manufactured by Silan. It features an EHSOP-5 package, which provides greater power efficiency, higher accuracy, and higher isolation when compared to regular packages. It is RoHS compliant and designed to regulate and control switching power supplies. The IC is able to achieve an input voltage range of 200 VAC to 600 VAC and an output voltage range of 2.5 VDC to 24 VDC. It also features an AFPS protection function that helps to reduce output switching ripple, improved EMI characteristics, and user-friendly design. Furthermore, the IC is able to detect current overload, open loop, and short circuit protection to prevent current overload and overheating. With its high voltage operational range and multiple safety features, the SD8666QS is suitable for multiple industrial applications.