Schottky diode is a kind of semiconductor device with low power consumption and high speed. It is characterized by extremely short reverse recovery time (as small as a few nanoseconds), and the forward conduction voltage drop is only about 0.4V. It is mainly used as high-frequency, low-voltage, large current rectifier diode, free wheeling diode, protection diode, and also used as rectifier diode and small signal detection diode in microwave communication and other circuits. It is common in communication power supply and frequency converter.
A typical application is that in the switching circuit of the bipolar transistor BJT, the Shockley diode is connected to the BJT to clamp, so that the transistor is actually in a very close off state in the on state, thereby improving the switching speed of the transistor. This method is a technique used in TTL internal circuits of typical digital ICs such as 74LS, 74als, and 74As.
Another characteristic 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: the withstand voltage is relatively low, and the leakage current is slightly larger. Comprehensive consideration shall be taken when selecting.
