Micro-Gap Design Low Capacitance 4.5mm*3.2mm SMD 230XM Gas Discharge Tube For Power Supplies
SMD 230XM.pdf
Gas discharge tube is a gap-type lightning protection component, which has been widely used in lightning protection of communication systems. The discharge tube is often used in the first or first two stages of a multi-level protection circuit to discharge lightning instantaneous overcurrent and limit overvoltage. Since the inter-electrode insulation resistance of the discharge tube is large and the parasitic capacitance is small, it is not suitable for high frequency Lightning protection for signal lines has definite advantages. The main shortcomings of the protection characteristics of the discharge tube are that the discharge time delay is large, the action sensitivity is not ideal, and it is difficult to effectively suppress the lightning wave with a steep rise of the wave head, and there is a freewheeling problem in the lightning protection of the power system.
Commonly used gas discharge tubes include two-electrode discharge tubes and three-electrode discharge tubes. Most of the packaging shell materials are ceramics, so they are called ceramic discharge tubes.
Selection principle
(1) The DC discharge voltage of the gas discharge tube must be higher than the maximum voltage during normal operation of the line, so as not to affect the normal operation of the line.
(2) The pulse discharge voltage of the gas discharge tube must be lower than the highest instantaneous voltage value that the line can withstand, so as to ensure that the gas discharge tube can respond faster than the line in the event of instantaneous overvoltage, and limit the overvoltage to a safe value in advance .
(3) The holding voltage of the gas discharge tube should be as high as possible. Once the overvoltage disappears, the gas discharge tube can be extinguished in time without affecting the normal operation of the line.
(4) The ground wire should be as short as possible and thick enough to facilitate the discharge of transient large currents.
(5) If the overvoltage lasts too long, the gas discharge tube will generate a lot of heat. In order to prevent damage to the protected equipment due to overheating, the gas discharge tube should be equipped with a failure protection card device. Nowadays, some new products of gas discharge tubes have fail-safe cards.
Features
• RoHS & HF compliant
• Size:4.5mm*3.2mm
• DC Spark-over voltage: 75~1000V
• Stable breakdown voltage.
• High insulation resistance.
• High holdover voltage.
• Large absorbing transient current capability.
• Low Capacitance
• Micro-Gap Design
Recommended Applications
• Communication equipment • CATV equipment
• Test equipment
• Data lines
• Power supplies
• Telecom SLIC protection
• Telecommunications
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