Industry-Verified Manufacturing Data (2026)

Gas Discharge Tube (GDT)

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Gas Discharge Tube (GDT) used in the Computer, Electronic and Optical Product Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Gas Discharge Tube (GDT) is characterized by the integration of Electrodes and Gas Chamber. In industrial production environments, manufacturers listed on CNFX commonly emphasize ceramic or glass envelope construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A protective device that uses gas ionization to divert high-voltage surges away from sensitive electronic circuits.

View Full Specifications Explore Manufacturing Sources

Product Specifications

Technical details and manufacturing context for Gas Discharge Tube (GDT)

Definition
A gas discharge tube is a key component in line protection circuitry that provides overvoltage protection by creating a low-impedance path to ground when voltage exceeds its breakdown threshold. It functions as a fast-acting switch that activates during voltage transients, lightning strikes, or electrostatic discharge events to protect downstream equipment.
Working Principle
The GDT contains inert gas (typically neon, argon, or xenon) between two or more electrodes. Under normal operating conditions, the gas remains non-conductive. When voltage exceeds the tube's breakdown voltage, the gas ionizes, creating a plasma that conducts current and shunts the surge to ground. Once the surge passes and current drops below the holding current, the gas deionizes and returns to its high-impedance state.
Common Materials
ceramic or glass envelope, metal electrodes (copper, nickel, or tungsten), inert gas mixture (neon/argon/xenon)
Technical Parameters
  • DC breakdown voltage rating (kV) Standard Spec
Components / BOM
  • Electrodes
    Provide electrical connection points and initiate gas ionization
    Material: copper or nickel alloy
  • Gas Chamber
    Contains inert gas mixture at controlled pressure for ionization
    Material: ceramic or glass
  • Terminals
    External connection points for circuit integration
    Material: tin-plated copper
Engineering Reasoning
75-1500 V DC breakdown voltage, 5-20 kA surge current, 1-10 ns response time
Breakdown voltage tolerance ±15% from rated value, electrode erosion exceeding 0.5 mm depth, gas pressure drop below 50 mbar from initial 300-1000 mbar fill pressure
Design Rationale: Electrode sputtering from repeated arc discharges causing material deposition on ceramic walls, gas adsorption into electrode materials reducing internal pressure below Paschen's law minimum, thermal runaway from joule heating exceeding 200°C melting glass-to-metal seals
Risk Mitigation (FMEA)
Trigger Continuous overvoltage at 110% of rated DC breakdown voltage for >100 ms
Mode: Thermal ionization creating conductive plasma channel that fails to extinguish, causing sustained short circuit
Strategy: Series current-limiting resistor of 10-100 Ω, parallel metal oxide varistor with clamping voltage 20% above GDT rating, thermal fuse rated at 85°C mounted adjacent to GDT body
Trigger High di/dt surge exceeding 100 A/μs from nearby lightning strike coupling
Mode: Electrode material vaporization creating metallic bridge that permanently lowers breakdown voltage by 40-60%
Strategy: Multistage protection with 1 mH series inductor before GDT, ceramic gas-filled spark gap upstream with 50% higher voltage rating, shielded enclosure with 360° RF gasketing to reduce electromagnetic coupling

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Gas Discharge Tube (GDT).

high voltage surge protection GDT gas discharge tube for electronic circuits ceramic envelope gas arrester inert gas mixture surge diverter GDT protection computer manufacturing

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Line Protection Circuitry
View system integration details

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 1.5 bar
other spec: Surge current: 5kA to 100kA, DC spark-over voltage: 75V to 10kV
temperature: -40°C to +85°C
Media Compatibility
✓ Telecommunication lines ✓ Power supply circuits ✓ Data transmission lines
Unsuitable: High humidity or condensing environments
Sizing Data Required
  • Maximum continuous operating voltage (MCOV)
  • Surge current rating (kA)
  • DC spark-over voltage

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Dielectric breakdown
Cause: Overvoltage events exceeding GDT's rated voltage, causing permanent conductive path formation and loss of protection capability.
Electrode degradation
Cause: Repeated surge discharges causing electrode erosion, material migration, and increased leakage current over time.
Maintenance Indicators
  • Visible discoloration, cracking, or bulging of the ceramic or glass housing
  • Audible arcing or hissing sounds during normal operation indicating continuous discharge
Engineering Tips
  • Install GDTs with proper voltage ratings (typically 20-30% above operating voltage) and ensure correct coordination with other protective devices
  • Implement regular insulation resistance testing and visual inspections to detect early degradation before catastrophic failure

Compliance & Manufacturing Standards

Reference Standards
IEC 61643-11: Surge protective devices connected to low-voltage power systems - Requirements and test methods UL 1449: Standard for Surge Protective Devices EN 61643-11: Low-voltage surge protective devices - Surge protective devices connected to low-voltage power systems - Requirements and test methods
Manufacturing Precision
  • Electrode spacing: +/-0.05mm
  • Glass-to-metal seal hermeticity: <1x10^-8 atm·cc/sec helium leak rate
Quality Inspection
  • DC sparkover voltage test
  • Impulse current withstand test (8/20 μs waveform)

Factories Producing Gas Discharge Tube (GDT)

Verified manufacturers with capability to produce this product in China

Add your factory

✓ 96% Supplier Capability Match Found

P Procurement Specialist from Australia Jan 11, 2026
★★★★★
"Great transparency on the Gas Discharge Tube (GDT) components. Essential for our Computer, Electronic and Optical Product Manufacturing supply chain."
Technical Specifications Verified
T Technical Director from Singapore Jan 08, 2026
★★★★★
"The Gas Discharge Tube (GDT) we sourced perfectly fits our Computer, Electronic and Optical Product Manufacturing production line requirements."
Technical Specifications Verified
P Project Engineer from Germany Jan 05, 2026
★★★★★
"Found 39+ suppliers for Gas Discharge Tube (GDT) on CNFX, but this spec remains the most cost-effective."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

12 sourcing managers are analyzing this specification now. Last inquiry for Gas Discharge Tube (GDT) from Thailand (36m ago).

Supply Chain Compatible Machinery & Devices

Modular Industrial Edge Computing Device

Rugged computing platform for industrial data processing at the network edge

Explore Specs →
Industrial Smart Camera Module

Embedded vision system for industrial automation and quality inspection.

Explore Specs →
Industrial Wireless Power Transfer Module

Wireless power transfer module for industrial equipment applications

Explore Specs →
Industrial Smart Sensor Module

Modular industrial sensor with embedded processing and wireless connectivity

Explore Specs →

Frequently Asked Questions

How does a Gas Discharge Tube protect electronic equipment?

A GDT protects by using gas ionization between electrodes to create a low-resistance path, diverting high-voltage surges away from sensitive circuits before they can cause damage.

What materials are used in GDT construction?

GDTs typically feature ceramic or glass envelopes, metal electrodes (copper, nickel, or tungsten), and inert gas mixtures like neon, argon, or xenon for reliable surge diversion.

Where are Gas Discharge Tubes commonly used in manufacturing?

GDTs are essential in computer, electronic, and optical product manufacturing for protecting sensitive components in power supplies, communication lines, and data interfaces from voltage spikes.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Specifications verified by CNFX Industrial Index (v2.6.03) for Computer, Electronic and Optical Product Manufacturing sector.

Get Quote for Gas Discharge Tube (GDT)

Request technical pricing, lead times, or customized specifications for Gas Discharge Tube (GDT) directly from verified manufacturing units.

Your business information is encrypted and only shared with verified Gas Discharge Tube (GDT) suppliers.

Thank you! Your message has been sent. We'll respond within 1–3 business days.
Thank you! Your message has been sent. We'll respond within 1–3 business days.

Need to Manufacture Gas Discharge Tube (GDT)?

Connect with verified factories specializing in this product category

Add Your Factory Contact Us
Previous Product
Gas Chamber
Next Product
Gas enclosure