حفاظت مدار برق‌گیر گازی (جی دی تی)

Product Attributes

Introduction

A gas discharge tube (GDT) normally maintains a high insulation resistance state, equivalent to an open circuit, with negligible impact on normal circuit operation. When a transient overvoltage occurs in the circuit and its amplitude exceeds the GDT's breakdown voltage, the gas inside the tube becomes ionized, causing the GDT to conduct rapidly and clamp the overvoltage to a lower level, thereby protecting parallel-connected electronic equipment or circuit components from high-voltage damage. Once the overvoltage subsides, the GDT immediately returns to its high insulation resistance state and normal circuit operation resumes. The 3R090-3SQ-C GDT is a surface mount component. Its compact form factor allows easy installation on various space-constrained PCBs, while delivering excellent performance. Its low capacitance characteristic minimizes signal degradation when used in high-frequency communication circuits. The high insulation resistance ensures no additional losses to circuit performance under normal operating conditions. Beyond communication interface protection, its ability to withstand high surge currents also makes it suitable for power supply protection.

Features

• Ultra-compact size
• Excellent response to fast-rising transients
• Stable breakdown voltage
• Operating frequency up to GHz range
• 8/20µs pulse current capability: 6KA
• Surface mount package
• Non-radioactive
• Ultra-low capacitance (<1pF)
• High insulation resistance
• Dimensions: 6.8mm×3.5mm×4.0mm

Applications

• Communications
• Satellite and cable TV equipment
• Cable TV equipment
• Test equipment
• Consumer electronics