The SMD2921-300N Gas Discharge Tube (GDT) from RUILON is a high-performance surge protection component designed to protect electronic systems from lightning-induced surges, transient overvoltage, and high-energy electrical disturbances. With a nominal DC spark-over voltage of 300V (tested at 100V/µs), it delivers fast and reliable triggering, ensuring efficient diversion of surge currents away from sensitive circuitry.
Built using advanced ceramic gas discharge technology, the SMD2921-300N offers stable impulse spark-over performance (1kV/µs), high insulation resistance, and ultra-low capacitance at 1 MHz, making it suitable for high-speed communication lines and signal-sensitive applications with minimal signal distortion. Its high impulse discharge current capability (8/20µs waveform) and excellent impulse withstand voltage ensure long-term durability and stable protection performance even under repeated surge events.
Compared to lower voltage GDT series, the 300V variant provides a higher operating voltage margin and improved system stability, making it ideal for industrial-grade and communication applications requiring enhanced voltage tolerance. The SMD2921 package offers a balanced combination of compact size, thermal performance, and mechanical reliability, while supporting automated surface-mount assembly for efficient PCB manufacturing.
Key Features:
- DC Spark-Over Voltage: 300V @ 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:
- Telecom and networking infrastructure
- Industrial control systems
- Power supply and inverter protection
- Smart meters and communication devices
- Consumer electronics and IoT systems
- Lightning and surge protection circuits
