High voltage diodes are designed for use in high-voltage applications. There are many types of products. PN junction diodes are designed for general-purpose applications. Zener diodes act as normal rectifiers until the applied voltage reaches a certain point. Schottky barrier diodes are used in high frequency and fast-switching applications. PIN diodes are three-layer semiconductors with an intrinsic layer that separates heavily-doped P and N layers. Varactor diodes are P-N junction diodes that act as voltage-controlled capacitors when operated under reverse bias. Step-recovery diodes are designed for very frequency (VHF) applications. RF diodes are designed to handle frequency (RF) signals in devices such as stereo amplifiers, radio transmitters, television monitors, and other radio frequency or microwave devices. Transient voltage suppressor diodes (TVS) are semiconductors that limit over-voltages. Current limiting diodes (CLD) regulate current over a wide voltage range. Gunn diodes are transfer electron devices (TED) which exhibit a negative resistance region. Impact ionization avalanche transit-time (IMPATT) diodes are high voltage diodes which operate at a very high frequency and power.
