Classification of Crystal Diodes (2) 4

10. Zener diode is a product that replaces Zener electronic diode. Made into a diffusion type or alloy type of silicon. It is a diode with a sudden change in reverse breakdown characteristic curve. Made for use as control voltage and standard voltage. The terminal voltage (also known as Zener voltage) of a diode during operation ranges from around 3V to 150V, and can be divided into many levels every 10%. In terms of power, there are also products ranging from 200mW to over 100W. Working in reverse breakdown state, made of silicon material, with a small dynamic resistance RZ, generally 2CW type; Connecting two complementary diodes in reverse series to reduce the temperature coefficient is a 2DW type.

11. PIN diode is a crystal diode constructed by sandwiching a layer of intrinsic semiconductor (or semiconductor with low concentration impurities) between the P and N regions. The 'I' in PIN is an English abbreviation for 'intrinsic' meaning. When its operating frequency exceeds 100MHz, due to the storage effect of minority carriers and the transit time effect in the "intrinsic" layer, the diode loses its rectification function and becomes an impedance element, and its impedance value changes with the bias voltage. In zero bias or DC reverse bias, the impedance of the "intrinsic" region is very high; During DC forward bias, due to carrier injection into the "intrinsic" region, the "intrinsic" region exhibits a low impedance state. Therefore, PIN diodes can be used as variable impedance components. It is often used in high-frequency switches (i.e. microwave switches), phase shifting, modulation, limiting and other circuits.diode