Is the fast recovery diode a high-frequency diode?

Is the fast recovery diode a high-frequency diode?

fast recovery diode belong to high-frequency diodes, ordinary rectifier s belong to low-frequency s, and low-frequency s cannot effectively cut off when working at high frequencies because of the large junction capacitance. High frequency diodes are usually used in switching power supplies as rectifier diodes, and inverter circuits as continuous current and back voltage absorption diodes. In the diode model, the general high-frequency  model has F.

fast recovery diode can only exert their advantages in high-frequency circuits. However, as long as the voltage and current meet the requirements, they can be directly used in low-frequency circuits. Conversely, low-frequency diodes cannot be used in high-frequency circuits.

High frequency fast recovery diode refers to a diode with a short reverse recovery time (less than 5us), which often adopts gold doping measures in the process. The structure includes PN junction structure and improved PIN structure. Its forward voltage drop is higher than that of ordinary diodes (1-2V), and its reverse voltage withstand is mostly below 1200V. In terms of performance, it can be divided into two levels: fast recovery and ultra fast recovery. The former has a reverse recovery time of hundreds of nanoseconds or longer, while the latter has a recovery time of less than 100 nanoseconds.

Selection Techniques for High Frequency Diodes

1. Current, usually viewed as IF;

2. Withstand voltage, how much V is required for the reverse direction? Generally, if 600V, 1000V must be chosen. 200V, you can start with 600V. Leave a margin.

3. Depending on the usage environment, in the rectifier circuit, whether it is low-frequency or high-frequency, the low-frequency rectifier diode should be replaced by the ordinary rectifier diode, the intermediate frequency rectifier diode should be replaced by the fast recovery rectifier diode, and the high-frequency rectifier diode should be replaced by the ultra fast recovery rectifier diode.

4. Usage: Rectifier? Protection? Still stabilizing? Select rectifier diode, TVS, ZNR voltage regulator

5. According to the usage environment, such as high temperature and humidity, choosing the corresponding packaging shape is one