There are several types of diodes classified according to their characteristics

There are several types of diodes classified according to their characteristics

Point contact diodes are classified according to their forward and reverse characteristics as follows:

1. Generally, point contact diodes are used

As the title suggests, this type of diode is commonly used in detection and rectification circuits, and is an intermediate product with neither particularly good nor particularly bad forward and reverse characteristics. For example, SD34, SD46, 1N34A, etc. belong to this category.

2. High reverse withstand voltage point contact diode

It is a product with high maximum peak reverse voltage and maximum DC reverse voltage. Used for detection and rectification of high-voltage circuits. This type of diode generally has poor or average forward characteristics. In point contact germanium diodes, there are SD38, 1N38A, OA81, and so on. This germanium material diode has limited voltage resistance. Higher requirements include silicon alloys and diffusion type.

3. High reverse resistance point contact diode

The forward voltage characteristics are the same as those of typical diodes. Although its reverse withstand voltage is particularly high, its reverse current is small, so its advantage is its high reverse resistance. In circuits with high input resistance and high resistance load resistance, for germanium material high reverse resistance diodes, SD54, 1N54A, etc. belong to this type of diode.

4. High conductivity point contact diode

It is opposite to the high reverse resistance type. Although its reverse characteristic is poor, it makes the forward resistance small enough. For high conductivity point contact diodes, there are SD56, 1N56A, and so on. For high conductivity key type diodes, better characteristics can be obtained. This type of diode has high rectification efficiency when the load resistance is particularly low.