Zener diode

Zener diode (also known as Zener diode), this diode is a semiconductor device with high resistance until the critical reverse breakdown voltage.

The Zener diode is commonly used in the circuit with "ZD" plus a number, such as: ZD5 represents the voltage regulator number 5.

The voltage regulation principle of the Zener diode: The characteristic of the Zener diode is that after the breakdown, the voltage at both ends remains basically unchanged. Thus, when the voltage regulator is connected to the circuit, if the voltage of each point in the circuit fluctuates due to fluctuations in the power supply voltage or other reasons, the voltage across the load will remain substantially unchanged.

Fault characteristics: The fault of the Zener diode is mainly manifested in open circuit, short circuit and unstable voltage regulation value. Among the three types of faults, the former fault shows a rise in the power supply voltage; the latter two faults show that the power supply voltage goes low to zero volts or the output is unstable. The types and voltage regulation values of commonly used Zener diodes are as follows: Model 1N47281N4729 1N4730 1N4732 1N4733 1N4734 1N4735 1N4744 1N4750 1N4751 1N4761 Regulatory value 3.3V 3.6V 3.9V 4.7V 5.1V 5.6V 6.2V 15V 27V 30V 75V.