Zener diode, also known as Zener diode, is a special type of diode whose main function is to stabilize voltage. In various electronic devices, voltage stabilizing diodes play a crucial role. This article will provide a detailed introduction to the working principle of voltage regulator diodes and provide a practical selection guide.

1、 The working principle of voltage regulator diode

The working principle of a voltage regulator diode mainly depends on its reverse breakdown characteristics. When biased in the forward direction, the behavior of the voltage regulator diode is no different from that of a regular diode. However, in reverse bias, when the voltage reaches a certain value (called zener voltage or breakdown voltage), the diode will begin to conduct electricity, forming a stable voltage drop. Therefore, voltage regulator diodes are often used as voltage regulators to protect circuits from overvoltage damage.

2、 Selection Guide for Zener Diodes

Determine the working voltage: First, you need to clarify what voltage your circuit needs to stabilize at. There are various specifications for the breakdown voltage of the voltage regulator diode, and you need to choose a diode that matches your desired operating voltage.

Determine power capacity: Zener diodes will have a certain power consumption during operation, so you need to choose a diode that can withstand the expected power consumption of your circuit. Diodes with low power capacity may burn out during operation.

Determine packaging form: Zener diodes come in various packaging forms, such as DO-35, DO-41, SOD-123, etc. You need to choose the appropriate packaging based on your circuit design and space limitations.

Consider temperature coefficient: The breakdown voltage of a voltage regulator diode will be affected by temperature. When choosing a diode, you need to consider its temperature coefficient to ensure that it can provide stable voltage at different temperatures.

Search for the data manual: Finally, but equally important, consult the diode's data manual. The data manual will provide detailed performance parameters, such as breakdown voltage, operating current, power capacity, etc., which are important factors that you need to consider when selecting.