GAS DISCHARGE TUBES (GDTS)
Littelfuse's 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.
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 makes 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.
BENEFITS APPLICATIONS
Helps provide overvoltage fault protection against Telecommunications
damage caused by high energy surges - MDF modules, xDSL equipment, RF systems,
antenna, base stations
Suitable for use in sensitive equipment due to
impulse sparkover response Industrial and Consumer Electronics
- Power supplies, surge protectors, alarm systems,
Suitable for high-frequency applications
irrigation systems
Highly reliable performance
New surface-mount devices for automated
manufacturing
FEATURES
RoHS compliant Devices tested per ITU K.12 recommendations
Various lead configurations and surface-mount
Halogen free
options
(refers to: Br 900ppm, Cl 900ppm, Br+Cl 1500ppm)
Wide range of voltages (75V-4000V) Optional fail-short mechanism
Wide range of form factors Non radioactive materials
(3mm, 5mm, 6mm, 7mm, 8mm diameter devices)
Devices certified to UL497B and UL1449
Low capacitance and insertion loss
Crowbar device with low arc voltage
High accuracy spark-over voltages for high precision
designs
RoHS Compliant, ELV Compliant Specifications subject to change without notice. 2016 Littelfuse, Inc. 73Gas Discharge Tubes (GDTs)
Figures G1-G2 Typical Circuits for Gas Discharge Tubes
Figure G1 Figure G2
TwTwo Electro Electrode Devices fode Devices for Ungror Ungrounded Cirounded Circuitscuits ThrThree Electree Electrode Devices fode Devices for Gror Grounded Cirounded Circuitscuits
PolySPolySwitcwitch Deh Devicevice PolySPolySwitcwitch Deh Devicevice
(A) (A) (A)(A) (A) (A) (A)(A)
TelecomTelecom ProtectedProtected TelecomTelecom ProtectedProtected
GDTGDT GDTGDT
LineLine EquipmentEquipment LineLine EquipmentEquipment
(B) (B) ThyristorThyristor(B)(B) (B) (B) ThyristorsThyristors (B)(B)
PolySPolySwitcwitch h
DeviceDevice
Table G1 Device Voltage Ratings, Surge Rating, Capacitance, Insulation Resistance
and Agency Approval for Two-Electrode Gas Discharge Tubes
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
AC Discharge
DC DC Impulse Current
Sparkover Impulse Holdover On-State Discharge Impulse (1s duration; Insulation
Voltage Sparkover Voltage Voltage Voltage Current Life 10 hits) Capacitance Resistance UL Rating
@ 100V/s Nominal
20% Per (@1A) 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 150 500 600 <80 20 5kA 100A 5Arms <1pF 10,000 (M) All Devices
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
74 Specifications subject to change without notice. 2016 Littelfuse, Inc.