Schottky diode Schottky diode, also known as Schottky barrier diode (SBD), is a low-power and ultra-high-speed semiconductor device. The most remarkable feature is that the reverse recovery time is very short (as small as a few nanoseconds), and the forward turn-on voltage drop is only about 0.4V V. It is mostly used as high frequency, low voltage and high current rectifier diode, freewheeling diode and protection diode, and also used as rectifier diode and small signal detector diode in microwave communication circuits. It is common in communication power supply and frequency converter. A typical application is that in the switching circuit of bipolar transistor BJT, a Shockley diode is connected to the BJT to clamp it, so that the transistor is actually in a very close off state when it is on, thus improving the switching speed of the transistor. This method is used in TTL internal circuits of typical digital IC such as 74LS, 74ALS and 74AS. The biggest feature of Schottky diode is that the forward voltage drop VF is relatively small. Under the same current, its forward voltage drop is much smaller. In addition, its recovery time is short. It also has some disadvantages: low withstand voltage and slightly larger leakage current. When selecting, it should be considered comprehensively.