Gas Discharge Tubes
Gas Discharge Tubes (GDTs)
TE Circuit Protections 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 inuence 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.
Our GDTs offer a high level of surge protection, a broad
voltage range, low capacitance and many form factors
including new surface mount devices, which make them
suitable for applications such as Main Distribution Frame
(MDF) modules, high data-rate telecom applications
(e.g., ADSL, 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.
Benets Features
Helps provide overvoltage fault protection against RoHS compliant
damage caused by high energy surges
Halogen free
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Suitable for use in sensitive equipment due to impulse (refers to: Br#900ppm, Cl#900ppm, Br+Cl#1500ppm)
sparkover response
Wide range of voltages (75V-4000V)
Suitable for high-frequency applications
Wide range of form factors
Highly reliable performance (3mm, 5mm, 6mm, 7mm, 8mm diameter devices)
New surface-mount devices for automated Low capacitance and insertion loss
manufacturing
Crowbar device with low arc voltage
High accuracy spark-over voltages for high precision designs
Devices tested per ITU K.12 recommendations
Various lead congurations and surface-mount options
Optional fail-short mechanism
Non radioactive materials
Devices certied to UL497B and UL1449
Applications
Telecommunications Industrial and Consumer Electronics
- MDF modules, xDSL equipment, RF systems, - Power supplies, surge protectors, alarm systems,
antenna, base stations irrigation systems
RoHS Compliant, ELV Compliant HF Halogen Free
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2013_CP_S09-GDT.indd 95 8/3/13 11:05 AMFigures G1-G2 Typical Circuits for Gas Discharge Tubes (GDTs)
Figure G1 Figure G2
Two Electrode Devices for Ungrounded Circuits Three Electrode Devices for Grounded Circuits
PolySwitch Device PolySwitch Device
(A) (A) (A) (A)
Telecom Protected Telecom Protected
GDT GDT
Line Equipment Line Equipment
(B) Thyristor (B) (B) Thyristors (B)
PolySwitch
Device
Device Voltage Ratings, Surge Rating, Capacitance, Insulation Resistance and
Table G1
Agency Approval for Two-Electrode Gas Discharge Tubes (GDTs)
DC Impulse Impulse
Sparkover Sparkover Impulse Withstanding Insulation
Voltage Voltage Discharge Current Voltage Capacitance Resistance UL Rating
8x20s 8x20s 10/700s
10 Hits 300 Hits 10 Hits
@ 100V/s
(5 Hits Each (150 Hits Each (5 Times Each
Part Number 20% Tolerance @ 1kV/s Polarity) Polarity) Polarity) @1MHz @100V UL497B #E179610
DC
75* 600
90 600
GTCS23-XXXM-R01-2 1kA 100A 4kV <0.5pF 1,000 (M) All Devices
140 600
150 600
200 700
230 700
GTCC23-XXXM-R01-2 300 900 1kA 100A 6kV <0.5pF 1,000 (M) All Devices
350 1000
400 1000
* DCSO 60~105
Devices <=150V measured @ 50V
DC
Effective output impedance: 40ohms
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AC Discharge
DC DC
Impulse
Current
Sparkover Impulse Holdover On-State Discharge Impulse Insulation
(1s duration;
Voltage Sparkover Voltage Voltage Voltage Current Life 10 hits) Capacitance Resistance UL Rating
Nominal
@ 100V/s
(@1A)
20% Per 8x20s 10x1000s UL497B
Part Number Tolerance @ 100V/s @ 1kV/s ITU K.12 (V) 10 Hits 300 Hits @ 50 Hz @ 1MHz @ 100V #E179610
DC
75 450 550 <52 20
GTCX25-XXXM-R02 2.5kA 100A 2.5Arms <1pF 10,000 (M) All Devices
90 450 550 <52 20
140 500 600 <80 20
GTCX26-XXXM-R05 5kA 100A 5Arms <1pF 10,000 (M) All Devices
150 500 600 <80 20
200 600 700 <135 20
230 600 700 <135 20
250 600 700 <135 20
GTCX28-XXXM-R05 5kA 100A 5Arms <1pF 10,000 (M) All Devices
260 700 800 <135 20
300 800 900 <150 20
350 900 1000 <150 20
400 900 1000 <150 20
GTCX28-XXXM-R10 10kA 100A 10Arms <1pF 10,000 (M) All Devices
420 900 1000 <150 20
470 1050 1150 <150 20
500 1100 1200 <150 20
550 1300 1400 <150 20
GTCX28-XXXM-R20** 20kA 100A 20Arms <1.5pF 10,000 (M) All Devices
600 1300 1400 <150 20
** GTCX28-XXXM-R20 parts only up to 350V
<1.2pF for 75V and 90V devices.
RoHS Compliant, ELV Compliant HF Halogen Free
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