حفاظت مدار برق‌گیر گازی (جی دی تی)

Product Attributes

Introduction

Gas discharge tubes normally maintain a high insulation resistance state, equivalent to an open circuit, with virtually no impact on normal circuit operation. When a transient overvoltage occurs in the circuit and its amplitude exceeds the breakdown voltage of the gas discharge tube, the gas inside becomes ionized, causing the tube to conduct rapidly and clamping the overvoltage to a lower level, thereby protecting parallel-connected electronic equipment or circuit components from high-voltage damage. Once the overvoltage subsides, the gas discharge tube immediately returns to its high insulation resistance state and the circuit resumes normal operation. The SMD4042 series gas discharge tubes feature a surface-mount package that is compact and easy to install on various space-constrained PCBs, while delivering excellent performance. The low capacitance characteristic minimizes signal interference in high-frequency communication circuits. The high insulation resistance ensures no additional losses to circuit performance under normal operating conditions. In addition to communication interface protection, the series is also suitable for power supply protection due to its ability to withstand high surge currents (8/20μs, 5kA/3kA).

Features

• Excellent response to fast-rising transients
• Stable breakdown voltage
• Operating frequency up to GHz
• 8/20μs pulse current capability: 5kA/3kA
• Surface mount package
• Non-radioactive
• Ultra-low capacitance (<0.8pF)
• Dimensions: 4.0mm × 4.2mm × 4.2mm

Applications

• CATV equipment
• Telecom base stations
• AC power mains
• Electric vehicle charging
• Inverter/variable frequency drives
• Ethernet interfaces
• Broadband equipment
• Medical electronics
• Test equipment
• General telecom equipment
• Renewable energy