Classification of Crystal Diodes (3)

3、 According to their characteristics, point contact diodes are classified into forward and reverse characteristics as follows.

1. Point contact diodes are commonly used in detection and rectification circuits, as the title suggests. They are intermediate products 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 diodes are products 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. The forward voltage characteristics of high reverse resistance point contact diodes are the same as those of commonly used diodes. Although its reverse withstand voltage is particularly high, its reverse current is small, so its advantage is its high reverse resistance. Used for circuits with high input resistance and high resistance loads