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Gas Discharge Tubes (GDT)

gas discharge tubeRaychem Gas Discharge Tubes (GDTs) are commonly used to help protect sensitive telecom equipment such as power lines, communication lines, signal lines and data transmission lines from damage caused by transient surge voltages that typically result from lightning strikes and equipment switching operations.


Two Electrode R Series GDT GTCS23-xxxM-R01 GTCx25-xxxM-R02 GTCx26-xxxM-R05 GTCx28-xxxM-R05 GTCx28-xxxM-R10 GTCx28-xxxM-R20††
Number of Electrodes: 2 2 2 2 2 2
Diameter (mm): 3mm 5mm 6mm 8mm 8mm 8mm
DC Sparkover Voltage (V): 75** | 230 75-600 75-600 75-600 75-600 75-230
Impulse Discharge Current (8x20us) 10 Hits (kA): 1kA 2.5kA 5kA 5kA 10kA 20kA
Impulse Discharge Current (8x20us) 300 Hits (kA): 100A 100A 100A 100A 100A 100A
Impulse Withstanding Voltage 10x700µs 10 hits 4kV          
AC Discharge   2.5Arms 5Arms 5Arms 10Arms 20Arms
Configuration SMD
Axial | No-lead | SMD
Capacitance @ 1MHz <0.5pF <1pF <1pF <1pF <1pF <1.5pF
Insulation Resistance @ 100V 1,000 (MΩ) * 10,000 (MΩ) * 10,000 (MΩ) * 10,000 (MΩ) * 10,000 (MΩ) * 10,000 (MΩ) *

Three Electrode R Series GDT GTCx35-xxxM-R05 GTCx36-xxxM-R10 GTCx37-xxxM-R10 GTCx38-xxxM-R10
Number of Electrodes: 3 3 3 3
Diameter (mm): 5mm 6mm 7mm 8mm
DC Sparkover Voltage (V): 75-600 75-600 75-600 75-600
Impulse Discharge Current (8x20us) 10 Hits (kA): 5kA 10kA 10kA 10kA
Impulse Discharge Current (8x20us) 300 Hits (kA): 100A 200A 200A 200A
AC Discharge 5Arms 10Arms 10Arms 10Arms
Configuration Axial
No-lead
SMD
T-lead
Axial
No-lead
Radial
SMD
No-lead
Radial
Axial
No-lead
Radial
SMD
Capacitance @ 1MHz <1pF <1pF <1pF <1pF
Insulation Resistance @ 100V 10,000 (MΩ) * 10,000 (MΩ) * 10,000 (MΩ) * 10,000 (MΩ) *
RoHS Compliant All parts are RoHS compliant
* Insulation Resistance measured at 50V for devices less than 90V
Insulation Resistance measured at 250V for devices less than 500V
† <1.2pF for 75V and 90V devices
** DCSO 60~105
†† GTCx28-xxxM-R20 parts only up to 230V

Two Electrode GDT - Example Part Number for R Series
GDT part numbering for Two Electrodes

Three Electrode GDT - Example Part Number for R Series
GDT part numbering for Three Electrodes

 

Marking Reference Guide for Gas Discharge Tubes


Example:
Raychem GDT Marking

 

Agency Recognition for Raychem Gas Discharge Tubes
Standard Title File Number
UL497B Transient Voltage Surge Suppressors   E179610*

Notes:
*All R series devices are UL 497B rated.

  • Operation beyond the maximum ratings or improper use may result in device damage and possible electrical arcing and flame.
  • The devices are intended for protection against occasional overvoltage fault conditions and should not be used when repeated fault conditions or prolonged trip events are anticipated.
  • Device performance can be impacted negatively if devices are handled in a manner inconsistent with recommended electronic, thermal, and mechanical procedures for electronic components.