Five important parameters of Zener Diode

Five important parameters of Zener Diode.
A Zener diode is a kind of diode that stabilizes the working voltage of the circuit. because of its special internal structure, it is suitable for the working state of reverse breakdown. As long as the current is limited, this breakdown is non-destructive. At this time, although the current through the Zener diode varies in a large range, the voltage at both ends of the Zener diode is almost unchanged and remains stable. Its usage in the circuit is completely different from that of ordinary diodes, it has the function of voltage stabilization, and its characteristic is that it has a stable terminal voltage during reverse breakdown.
The voltage regulator diode works by using the characteristic that the terminal voltage of the PN junction does not change with the reverse current in a certain range after the reverse breakdown. As can be seen from the figure below, the shape of the Zener diode is similar to that of some ordinary diodes, and its shell materials are mainly glass, plastic and metal. Generally, low-power Zener diodes are packaged with glass or plastic. High-power Zener diodes are packaged with a metal shell with good heat dissipation. Because Zener diodes are generally made of silicon semiconductors, they are also known as silicon Zener diodes and silicon Zener diodees.
Parameter description of Zener Diode:
The main use of Zener diodes is to stabilize voltage, so its technical parameters are roughly the same as those of ordinary diodes, mainly in the following five points.
1. Steady voltage.
This refers to the reverse voltage value of the diode at both ends within the range of its voltage regulation, which is usually described as the voltage stabilization value. The stable voltage value of Zener diode varies with its working current and temperature, but this change is not great. Different types of Zener diodes generally have different stable voltage, even if the same type of product, the voltage regulator value can not be exactly the same, should be selected according to the needs.
two。. Working current.
When the device is working, the reverse basic current passed through, the working current of the Zener diode is too small, the voltage stabilizing effect will become worse, and if the current is too large, the diodee body will be damaged due to high temperature. Generally, within the allowable working current range, the current is larger and the voltage stabilizing effect is relatively better, but the Zener diode needs more than a small spoon of electric energy. The difference between a Zener diode and an ordinary diode is that its working current flows from the negative to the positive, while the ordinary diode flows from the positive to the negative.
3. Working current.
Zener diodes can be allowed to pass through the reverse current value.
4. Dissipated power.
When the reverse current passes through the Zener diode, the allowable value of the power consumed by the diodee itself is called rated power. In practical use, the power consumed by Zener diodes is not allowed to exceed this limit.
5. Dynamic resistance.
When the Zener diode works, we hope that when the current variation range is very large, the stable voltage change is as small as possible. In order to accurately reflect this performance, it is stipulated that the ratio of the voltage change to the current change is called the driving resistance of the Zener diode. It can be seen that the smaller the dynamic resistance of the Zener diode is, the better the performance of the Zener diodee is. It is concluded that when the same Zener diode works, the dynamic resistance changes. When the current is larger, the dynamic resistance is smaller, while when the working current is smaller, the dynamic resistance increases.