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Gas discharge tubes (GDT) are sealed glass tubes containing a pair of electrodes and filled with a gas that only conducts when a high voltage is applied across the electrodes. When a voltage spike appears across the device the gas is ionised (becomes a conducting gas plasma) which short-circuits the spike energy away. Gas discharge tubes are often used to protect sensitive circuit inputs from potentially damaging interference voltage transients. The large amount of energy that can be dispersed by gas discharge tubes makes them a good choice for lightning surge protection, particularly for telecommunications equipment.

### Why use a gas discharge tube?

Most commonly used as a surge protection aid, gas discharge tubes are key in limiting surges in voltage across both electronic and electrical circuits. GDTs are great at handling high current feeds whilst also maintaining low capacitance and having excellent insulation resistance.



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Gas Discharge Tubes | GDT Surge Protection | RS

Gas Discharge Tubes

Bourns, 2038 150V 10kA, SMD Surge Absorber Gas Discharge Tube

Bourns, GDT25 420V 10kA, SMD Surge Arrester Gas Discharge Tube

Bourns, 2036 75V 20kA, SMD Surge Absorber Gas Discharge Tube

MITSUBISHI MATERIALS, DSAZR 800V 1kA, Through Hole Surge Absorber...

Bourns, GDT25, SMD Surge Arrester Gas Discharge Tube

Bourns, GDT25 470V 10kA, SMD Surge Arrester Gas Discharge Tube

Bourns, GDT25 150V 10kA, SMD Surge Arrester Gas Discharge Tube

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Bourns Gas Discharge Tubes | RS

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EPCOS Gas Discharge Tubes | RS

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Bourns Gas Discharge Tubes

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