Schottky diode, also known as Schottky barrier diode (SBD), is a low-power, ultra-high-speed semiconductor device. The most significant feature is that the reverse recovery time is very short (can be as small as a few nanoseconds), and the forward voltage drop is only about 0.4V. It is mostly used as a high frequency, low voltage, high current rectifier diode, continuous current diode, protection diode, and also useful in microwave communication circuits as a rectifier diode, small signal detection diode. It is more common in communication power supply and frequency converter.

A typical application is in the switching circuit of the bipolar transistor BJT, by connecting a Shockley diode on the BJT to clamp, so that the transistor is actually very close to the cut-off state when the on-state, so as to improve the switching speed of the transistor. This method is the technique used in TTL internal circuits of typical digital ics such as 74LS, 74ALS, 74AS, etc.

The biggest feature of Schottky diodes is that the forward voltage drop VF is small. At the same current, it has a much smaller forward voltage drop. In addition, its recovery time is short.

Electrode use. It is more common in communication power supply and frequency converter.