Switching diodes are a single PN diodes in a discrete package. is a small non-linear semiconductors devices generally used in electronic circuits, where small currents or high frequencies are involved such as in radio, television and digital logic circuits. switching diodes provides the same functionality as a switch. It has high resistance below the specified applied voltage similar to an open switch, whereas above that voltage it changes in a sudden way to the low resistance of a closed switch.Switching diodes have much lower power and current ratings, can function better in high frequency applications or in clipping and switching applications that deal with short-duration pulse waveforms. switching diodes are used in a wide variety of applications such as a switch in rectifiers, limiters, snubbers or in wave-shaping circuits. switching diodes are also used in high-speed rectifying applications, such as in radiofrequency receivers.