Fast Recovery Diode (FRD), also known as a Fast Recovery Epitaxial Diode (FRED), is a type of diode specifically designed to have a fast recovery time after being forward-biased and then turned off. The recovery time of a diode is the time it takes for the diode's reverse current to decrease to a specified fraction of its peak forward current. Fast recovery diodes are commonly used in circuits where switching speeds are important, such as in switching power supplies, motor drives, and high-frequency rectifiers.