Gas Discharge Tubes

GDTs from Littelfuse are placed in front of, and in parallel with, sensitive telecom equipment

Image of TE Connectivity's Gas Discharge TubesLittelfuse GDTs (Gas Discharge Tubes) are placed in front of, and in parallel with, sensitive telecom equipment such as power lines, communication lines, signal lines and data transmission lines to help protect them from damage caused by transient surge voltages that may result from lightning strikes and equipment switching operations. These devices do not influence the signal in normal operation. However, in the event of an overvoltage surge, such as a lightning strike, the GDT switches to a low impedance state and diverts the energy away from the sensitive equipment.

These GDTs offer a high level of surge protection, a broad voltage range, low capacitance, and many form factors including new surface-mount devices, which makes them suitable for applications such as MDF (Main Distribution Frame) modules, high data-rate telecom applications (e.g. ADSL and VDSL), and surge protection on power lines. Their low capacitance also results in less signal distortion. When used in a coordinated circuit protection solution with PolySwitch devices, they can help equipment manufacturers meet stringent safety regulatory standards.

  • Wide range of voltages (75 V - 4000 V)
  • Crowbar device with low arc voltage
  • Devices tested per ITU K.12 recommendations
  • Various lead configurations and surface-mount options
  • High accuracy spark-over voltages for high precision designs
  • Optional fail-short mechanism
  • Low capacitance and insertion loss
  • Wide range of form factor
  • Non-radioactive materials
  • Devices certified to UL497B and UL1449

Two Electrode Gas Discharge Tubes

ImageManufacturer Part NumberDescriptionVoltage - DC Spark Over (Nom)Available Quantity
GTCA25-750M-R02 datasheet linkGDT 75V 20% 2.5KA THROUGH HOLEGTCA25-750M-R02GDT 75V 20% 2.5KA THROUGH HOLE75V4217 - Immediate
GTCA25-750M-R02 product page link
GTCA25-401M-R02 datasheet linkGDT 400V 20% 2.5KA THROUGH HOLEGTCA25-401M-R02GDT 400V 20% 2.5KA THROUGH HOLE400V675 - Immediate
GTCA25-401M-R02 product page link
GTCA25-301M-R02 datasheet linkGDT 300V 20% 2.5KA THROUGH HOLEGTCA25-301M-R02GDT 300V 20% 2.5KA THROUGH HOLE300V988 - Immediate
GTCA25-301M-R02 product page link
GTCA25-900M-R02 datasheet linkGDT 90V 20% 2.5KA THROUGH HOLEGTCA25-900M-R02GDT 90V 20% 2.5KA THROUGH HOLE90V199 - Immediate
GTCA25-900M-R02 product page link
GTCA25-501M-R02 datasheet linkGDT 500V 20% 2.5KA THROUGH HOLEGTCA25-501M-R02GDT 500V 20% 2.5KA THROUGH HOLE500V970 - Immediate
GTCA25-501M-R02 product page link
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Three Electrode Gas Discharge Tubes

ImageManufacturer Part NumberDescriptionVoltage - DC Spark Over (Nom)Available Quantity
GTCA35-231M-R05-FT datasheet linkGDT 230V 20% 5KA T/H FAIL SHORTGTCA35-231M-R05-FTGDT 230V 20% 5KA T/H FAIL SHORT230V995 - Immediate
GTCA35-231M-R05-FT product page link
GTCA35-900M-R05-44 datasheet linkGDT 90V 20% 5KA THROUGH HOLEGTCA35-900M-R05-44GDT 90V 20% 5KA THROUGH HOLE90V390 - Immediate
GTCA35-900M-R05-44 product page link
GTCA35-900M-R05-FT datasheet linkGDT 90V 20% 5KA T/H FAIL SHORTGTCA35-900M-R05-FTGDT 90V 20% 5KA T/H FAIL SHORT90V1000 - Immediate
GTCA35-900M-R05-FT product page link
GTCA35-750M-R05 datasheet linkGDT 75V 20% 5KA THROUGH HOLEGTCA35-750M-R05GDT 75V 20% 5KA THROUGH HOLE75V990 - Immediate
GTCA35-750M-R05 product page link
GTCA35-421M-R05 datasheet linkGDT 420V 20% 5KA THROUGH HOLEGTCA35-421M-R05GDT 420V 20% 5KA THROUGH HOLE420V842 - Immediate
GTCA35-421M-R05 product page link
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Published: 2013-03-28