Understand the characteristics of several commonly used SMD diodes

Understand the characteristics of several commonly used Zener diode

1. Zener diode is a device made by utilizing the voltage stabilizing performance demonstrated by the reverse breakdown characteristics of the PN junction, also known as a Zener diodeor reverse breakdown diode, which plays a stabilizing role in the circuit voltage. It stabilizes the voltage by utilizing the characteristic that the reverse voltage does not change with the reverse current within a certain range of reverse current after the diode is reverse breakdown. Usually made of silicon semiconductor materials using alloy or diffusion methods. It has both the unidirectional conductivity characteristics of ordinary diodes and can operate in reverse breakdown states. At present, low temperature coefficient regulators are composed of two regulators connected in reverse series. By utilizing the different temperature coefficients of positive and negative when the two regulators are in a positive and negative working state, good temperature compensation can be obtained.

2. Zener diode Fast diodes include fast recovery diodes and Schottky diodes, mainly used in high-frequency rectifier circuits, high-frequency switching power supplies, high-frequency resistance capacitance absorption circuits, inverter circuits, etc

The reverse recovery time of fast diode can reach 10ns. It is a semiconductor diode with good switching characteristics and short reverse recovery time. It is mainly used in switching power supply, pwm pulse width modulator, frequency converter and other electronic circuits as high-frequency rectifier diode, Flyback diode or damping diode.

Schottky transistor is made based on the potential barrier layer formed by the contact between metal and semiconductor. Its main characteristics are low forward conduction voltage drop (about 0.45v), short reverse recovery time and low switching loss. It is a low-power, ultra-high speed semiconductor device, widely used in switching power supply, frequency converter, driver and other circuits, and used as high-frequency, low-voltage, high current rectifier diode, Flyback diode, and protection diode, Or it can be used as rectifier diode and small signal detector diode in Microwave transmission and other circuits.

3. The Zener diode structure is mainly a planar contact type, which is characterized by a relatively large allowable current and a high reverse breakdown voltage. It is widely used in circuits with low processing frequencies. The main consideration for the use of rectifier diodes is that the maximum rectifier current and maximum reverse operating voltage should be greater than the actual values in operation