SL1024B420R

Series:	SL1024B
Packaging:	Tray
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Moisture Sensitivity Level (MSL):	--
Voltage - DC Spark Over (Nom):	420V
Impulse Discharge Current (8/20µs):	20000A (20kA)
Tolerance:	--
Number of Poles:	3
Fail Short:	No
Mounting Type:	Through Hole
Package / Case:	Axial Cylinder, 3 Lead (Radial Bend)

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Gas Discharge Tube Arresters (GDTs)

Gas discharge tube arresters (GDTs) are devices that protect electronic circuits from damage and overvoltage due to lightning or inductive transients. SL1024B420R is one of the most commonly used GDTs. This article will explain the application field and working principle of this device.

Applications

GDTs are commonly used in various electronic circuits, including telecommunications, power systems, radio and television equipment, automotive and aircraft electronics, computer systems and equipment, instrumentation, and medical equipment.SL1024B420R GDTs are ideal for use in applications where fast overvoltages require a fast response. These GDTs have a high current diverting capability and can handle ratings of up to 1kA. They also have a low capacitance and impedance that makes them suitable for high frequency applications. Additionally, they are designed with a low thermal coefficient, which ensures reliable operation even under extreme temperature conditions.

Working Principle

SL1024B420R GDTs consist of a vacuum tube filled with a mixture of gases. When a high voltage current passes through the GDT, the gas mixture will start to ionize and form a plasma. This plasma conducts the current through the GDT, thus limiting the voltage and protecting the electronic circuit from damage. The ionized gas acts as a medium for current conduction, and the plasma is constantly maintained by maintaining a negative voltage relative to the GDT’s cathode. This negative voltage also helps to limit the peak voltage across the GDT. The voltage limitation is achieved by the gas acting as a “break down media”, which means that as the voltage/current across the GDT reaches a certain level, “triggers” will be generated, resulting in a free path for current conduction. GDTs have a fast response time, which is typically in the range of a few nanoseconds. This is necessary to provide protection against the short, high voltage spikes caused by lightning or inductive transients.

Conclusion

GDTs are widely used for protecting electronic circuits from catastrophic overvoltage transients. SL1024B420R GDTs are designed with a low capacitance and impedance which makes them suitable for high frequency applications. They have a high current diverting capability and a fast response time. Moreover, they are designed with a low thermal coefficient, which ensures reliable operation even under extreme temperature conditions.

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