SMD2921-400N Gas Discharge Tubes – SMD2921 Package | RUILON

The SMD2921-400N Gas Discharge Tube (GDT) from RUILON is a high-voltage surge protection device engineered to safeguard sensitive electronic circuits from lightning strikes, transient overvoltage, and high-energy surge events. With a nominal DC spark-over voltage of 400V (tested at 100V/µs), it ensures fast and precise triggering, efficiently diverting surge energy away from critical components and enhancing system reliability.

Utilizing advanced ceramic gas discharge technology, the SMD2921-400N delivers stable impulse spark-over performance (1kV/µs), high insulation resistance, and ultra-low capacitance at 1 MHz, making it highly suitable for high-speed communication lines and signal integrity-sensitive applications. Its strong impulse discharge current capability (8/20µs waveform) and excellent impulse withstand voltage ensure long service life and consistent protection performance even under repeated surge stress.

Compared to lower voltage GDT series, the 400V variant offers significantly higher operating voltage tolerance and improved protection margin, making it ideal for industrial and high-power communication systems. The SMD2921 package provides an optimal balance of compact size, mechanical strength, and thermal performance, while supporting automated surface-mount assembly for efficient PCB manufacturing and flexible design integration.

Key Features:

• DC Spark-Over Voltage: 400V @ 100V/µS
• Stable impulse spark-over voltage @ 1kV/µS
• High surge current capability (8/20µS)
• Low capacitance @ 1 MHz for signal integrity
• High insulation resistance
• Long service life and high reliability
• Compact SMD2921 surface-mount package

Applications:

• Industrial automation systems
• Telecom and networking equipment
• Smart grid and energy systems
• Power supply protection circuits
• IoT and communication modules
• Lightning and surge protection systems