Zener diode is a diode that stabilizes the working voltage of the circuit. Due to its special internal structure, it is suitable for reverse breakdown. As long as the current is limited, this breakdown is non-destructive. At this time, although the current flowing through the Zener diode varies within a wide range, the voltage across the Zener diode is almost unchanged and remains stable. Its use in the circuit is completely different from ordinary diodes. With voltage stabilization function, the terminal voltage is stable when reverse breakdown.
The main purpose of Zener diode is to stabilize voltage, so its technical parameters are roughly the same as ordinary diodes. There are mainly five types, namely stable voltage, operating current, maximum operating current, maximum power dissipation and dynamic resistance. So what are the functions of these parameters? Let Meirui explain to you:
Stable voltage refers to the reverse voltage value at both ends of the zener diode within the range of its voltage stabilization effect, usually expressed as a stabilization value. The stable voltage value of the Zener diode changes with the change of its working current and temperature, but this change is not very large. Different types of Zener diodes usually have different stable voltages. Even for products of the same type, the voltage stabilization value cannot be exactly the same, so you should choose it according to your needs when using it.
The operating current refers to the reverse basic current passed through when the device is working. If the working current of the Zener diode is very small, the voltage regulation effect will become worse. If the current is too large, the tube body will be damaged due to excessive temperature. Generally speaking, within the allowable working current range, the current is larger and the voltage stabilizing effect is relatively better, but the Zener diode needs a small spoonful of electric energy. The difference between a Zener diode and an ordinary diode is that its working current flows from negative to positive, while an ordinary diode flows from positive to negative.
Maximum operating current refers to the maximum reverse current allowed by the Zener diode. The maximum power dissipation refers to the maximum allowable power consumed by the tube itself when the reverse current passes through the Zener diode, which is called the rated power. In actual use, the power consumed by the Zener diode is not allowed to exceed this limit.
Dynamic resistance refers to the driving resistance of the Zener diode. We hope that when the current change range is large, the stable voltage change will be as small as possible. In order to accurately reflect this performance, the ratio of the voltage change to the current change is called the drive resistance of the Zener diode. It can be seen that the smaller the dynamic resistance of the Zener diode, the better the performance of the Zener diode. The conclusion is that when the same Zener diode works, the dynamic resistance changes. When the current is large, the dynamic resistance decreases, and when the working current is small, the dynamic resistance increases instead.
The above explanations are the main parameters of Zener diodes. I hope that reading it will be helpful to you. If you want to know more about Zener diodes, please contact customer service online or call our company's service hotline ( The upper right corner of the website) for consultation, we will be happy to provide you with quality service!