As a professional electronic engineer in the design of circuit protection program must be aware of all the electronic protection devices. The discharge tube as an example, in the market of electronic electronic protection device suppliers from the professional supply, discharge tube has three kinds: ceramic gas discharge tube, semiconductor discharge tube, glass discharge (discharge, discharge potent) of each type of tube according to the package form and parameters of the different divided into a series of models. Lightning hazards and electrostatic hazards is the electronic components of the killer, every year because of lightning and static damage and countless electronic products, the best way to reduce the damage is the use of circuit protection program. The most widely used lightning protection devices is a ceramic gas discharge tube, the ceramic discharge is the most widely used lightning protection devices, because both DC power supply lightning protection lightning or various signal, GDT can play a very good protective effect. Its biggest feature is the large flow, small capacitance between the class, high insulation resistance, breakdown voltage range.

In the lightning protection device as well as a recommended alternative is the application of glass discharge, or strong discharge, glass discharge (discharge tube, powerful lightning protection lightning protection device at the end of twentieth Century) is introduced, which combines the ceramic gas discharge tube and semiconductor overvoltage protection device has the advantages of high insulation resistance (not less than 10^8 omega), interelectrode capacitance is small (less than 0.8pF), the larger the discharge current (up to 3 kA), bidirectional symmetry, fast reaction speed (there is no breakdown time lag), stable and reliable performance, after the turn-on voltage is low, in addition to DC high breakdown voltage (up to 5000V) and advantages small volume, long service life etc.. The disadvantage is that the DC breakdown voltage is larger (+ 20%).

The lightning protection device overvoltage device of semiconductor arrester is good. Semiconductor arrester is an overvoltage protection device, which uses the principle of thyristor tube, depending on the breakdown current of PN junction trigger device turn-on discharge, can flow through great surge current or pulse current. The range of breakdown voltage constitutes the range of overvoltage protection. The use of solid discharge tube can be directly connected across the protected circuit ends. It has the characteristics of accurate conduction, quick response (NS), strong surge absorption capability, bidirectional symmetry and high reliability.