The US1DFA is a rectifier diode manufactured by ON Semiconductor. This diode is used for rectifying AC to DC power supply in electronic devices. It has a maximum forward current rating of 1 Amp and can withstand high pulse current and low reverse leakage. The US1DFA is designed for high efficiency and has 200V rating, making it ideal for applications with high voltage and high current requirements. It features a low thermal resistance and is capable of withstanding high temperature operations. This diode is one of the most common parts used in electronic circuits. It is widely used for various purposes such as bridge rectification, static switches, lightning protection, diode clamps, snubber circuits, and more.