Dongguan Chenglue Electronic co.,Ltd
Dongguan Chenglue Electronic co.,Ltd
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High Insulation Resistance 4.5mm*3.2mm SMD 230XM Gas Discharge Tube For Power Supplies
SMD 230XM.pdf
Working principle of gas discharge tube
When the applied voltage increases to exceed the dielectric strength of the gas, the gap between the two poles will break down the discharge, and the original insulating state will be transformed into a conductive state. residual pressure level.
The main components of the pentode discharge tube are basically the same as those of the two-pole and three-pole discharge tubes, and it has better discharge symmetry and is suitable for multi-line protection. (Commonly used in the protection of communication lines) The discharge dispersion of the two-pole discharge tube is relatively large. When using the two-pole discharge tube, the common-mode overvoltage may be converted into a differential-mode overvoltage. The normal operating voltage of the system applied to both ends of the discharge tube in the system should be lower than the voltage to maintain the discharge, otherwise there will be a freewheeling problem. The voltage value for sustaining glow discharge is higher than the voltage value for sustaining arc discharge
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