The selection for gas discharge tubes are purchasing and engineers required courses, so we in the selection at the same time, we must also understand each ceramic gas discharge tube manufacturers model name, so as not to make trouble, to keep up with the rhythm of the small to understand:
Ceramic gas discharge tube divided into diode and transistor, in general, know the nominal voltage, flow rate, and pipe size. Will be able to know the model. Named GDT is basically named DC breakdown voltage, electrode number, size and packaging information.
TG-B3R090L refers to the electronic tage brand manufacturers, said the 3 is the gas discharge tube is shown in table 090, DC breakdown voltage, L on behalf of 90V is a plug-in DIP package.
The main indicators of the gas discharge tube: response time, DC breakdown voltage, impulse breakdown voltage, flow capacity, insulation resistance, interelectrode capacitance etc..
Lightning protection of gas discharge tube is mainly used for power and signal lines. Understand the above information, the selection for us will have some help, then we directly into today‘s topic, the topic selection of ceramic gas discharge tube! Continue to look down down down

The selection of ceramic gas discharge tube:
(a) in the rapid pulse, GDT gas ionization requires a certain amount of time (usually 0.2 ~ 0.3 s, the fastest also has about 0.1 s), which has a higher amplitude spike will leak to the back. To curb the sharp pulse, there are several ways: A, in the discharge tube or shunt capacitor varistor; transmission line B, in the discharge tube after the series inductance or stay length is appropriate, the sharp pulse attenuation to the lower level; C, using two levels of protection circuit to discharge tube as the first stage in TVS tube or semiconductor discharge tube as second grade, two grade with resistance, inductance or self recovery fuse isolation.
(two) the selection of the DC breakdown voltage Vsdc: the minimum value of the DC breakdown voltage Vsdc should be greater than 1.2 times the maximum power peak voltage or the maximum signal voltage.
(three) the choice of impulse discharge current: to select the maximum surge current that may appear on the line or to protect the maximum surge current. Discharge tube impulse discharge current should be calculated according to the nominal impulse discharge current (or half of the single impulse discharge current).
(four) ceramic gas discharge tube for breakdown voltage error is large, generally do not make use of parallel.
(five) the continued flow problem: in order to make the normal arc discharge in shock after the breakdown in the possible freewheeling place (such as active circuit), in the discharge tube series varistor or self recover fuse limit continued flow, make it less than the holding current discharge tube.
We explain the GDT manufacturer name and GDT selection of different principles. If you still do not understand the shoes can consult the online sales department www.m.idea988.com electronic from the manager, he will be there for you to answer questions and recommend a better selection scheme!


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