STTH4R02S is an ultrafast diode rectifier manufactured by the STMicroelectronics company. This device is a 4-pin ultrafast rectifier intended to be used as a high-speed switching device, and is designed to offer high performance in a variety of applications, including high voltage motor drives, welding machines, lamp ballasts, and UPS systems. The diode is capable of providing fast recovery times with low turn-on losses, allowing it to rapidly switch high voltages and currents with minimal heat generation and energy loss. Additionally, the diode offers a low-profile construction and a range of UL recognized packages that make it suitable for any demanding application.