Gas Discharge Tubes
Gas Discharge Tubes
TE Circuit Protection’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 MDF (Main Distribution
Frame) 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
• Helps provide overvoltage fault protection against
damage caused by high energy surges
• Suitable for use in sensitive equipment due to impulse
sparkover response
• Suitable for high-frequency applications
• Highly reliable performance
• New surface-mount devices for automated
manufacturing
Features
• RoHS compliant
• Halogen free
(refers to: Br 900ppm, Cl 900ppm, Br+Cl 1500ppm)
• Wide range of voltages (75V-4000V)
• Wide range of form factors
(3mm, 5mm, 6mm, 7mm, 8mm diameter devices)
• Low capacitance and insertion loss
• Crowbar device with low arc voltage
• High accuracy spark-over voltages for high precision designs
• Devices tested per ITU K.12 recommendations
• Various lead configurations and surface-mount options
• Optional fail-short mechanism
• Non radioactive materials
• Devices certified to UL497B and UL1449
10
Applications
• Telecommunications
- MDF modules, xDSL equipment, RF systems,
antenna, base stations
OBSOLETE
• Industrial and Consumer Electronics
- Power supplies, surge protectors, alarm systems,
irrigation systems
NOT the LATEST
REVISION
63
Figure G1-G2 Typical Circuits for Gas Discharge Tubes
Figure G1
Two Electrode Devices for Ungrounded Circuits
PolySwitch Device
Figure G2
Three Electrode Devices for Grounded Circuits
PolySwitch Device
(A)
(A’)
(A)
(A’)
Telecom
Line
GDT
Protected
Equipment
Telecom
Line
GDT
Protected
Equipment
(B)
Thyristor
(B’)
(B)
PolySwitch
Device
Thyristors
(B’)
Table G1
Device Voltage Ratings, Surge Rating, Capacitance, Insulation Resistance, and
Agency Approval for Two Electrode Gas Discharge Tubes
DC
Sparkover
Voltage
Impulse
Sparkover
Voltage
Impulse
Withstanding
Voltage
10/700µs
10 hits
(5 times each
polarity)
Impulse
Discharge Current
8x20µs
10 hits
(5 hits each
polarity)
8x20µs
300 hits
(150 hits each
polarity)
Capacitance
Insulation
Resistance
UL Rating
Part Number
@ 100V/s
± 20% Tolerance
@ 1kV/µs
@1MHz
@100V
DC†
UL497B
#E179610
75*
90
GTCS23-XXXM-R01-2
140
150
200
230
GTCC23-XXXM-R01-2
300
350
400
* DCSO 60~105
† Devices <=150V measured @ 50V
DC
‡ Effective output impedance: 40ohms
600
600
600
600
700
700
900
1000
1000
1kA
100A
6kV
‡
<0.5pF
1,000 (MΩ)
All Devices
1kA
100A
4kV
<0.5pF
1,000 (MΩ)
All Devices
10
DC
Sparkover
Voltage
@ 100V/s
± 20%
Tolerance
Impulse
Sparkover Voltage
DC
Holdover
Voltage
Per
ITU K.12
On-State
Voltage
Nominal
(@1A)
(V)
Impulse
Discharge
Current
8x20µs
10 hits
Impulse
Life
10x1000µs
300 hits
AC Discharge
Current
(1sec duration;
10 hits)
Capacitance
Insulation
Resistance
UL Rating
UL497B
#E179610
Part Number
@ 100V/µs
@ 1kV/µs
@ 50 Hz
@ 1MHz
@ 100V
DC
75
GTCX25-XXXM-R02
90
140
150
GTCX26-XXXM-R05
200
230
250
260
GTCX28-XXXM-R05
300
350
400
GTCX28-XXXM-R10
420
470
500
GTCX28-XXXM-R20**
550
600
450
450
500
500
600
600
600
700
800
900
900
900
1050
1100
1300
1300
550
550
600
600
700
700
700
800
900
1000
1000
1000
1150
1200
1400
1400
<52
<52
<80
<80
<135
<135
<135
<135
<150
<150
<150
<150
<150
<150
<150
<150
20
20
20
20
20
20
20
20
5kA
20
20
20
20
20
20
20
20
20kA
100A
20Arms
<1.5pF
10,000 (MΩ)
All Devices
10kA
100A
10Arms
<1pF
††
10,000 (MΩ)
All Devices
100A
5Arms
<1pF
10,000 (MΩ)
All Devices
5kA
100A
5Arms
<1pF
10,000 (MΩ)
All Devices
2.5kA
100A
2.5Arms
<1pF
10,000 (MΩ)
All Devices
** GTCX28-XXXM-R20 parts only up to 350V
†† <1.2pF for 75V and 90V devices.
64
RoHS Compliant, ELV Compliant
HF
Halogen Free
Gas Discharge Tubes
Table G2
Device Voltage Ratings, Surge Rating, Capacitance, Insulation Resistance, and
Agency Approval for Two Electrode High Voltage Gas Discharge Tubes
DC
Sparkover
Voltage
@100V/s
± 20%
Tolerance
Impulse
Sparkover
Voltage
Impulse Life
10/1000µs
100A
AC Discharge Current,
50 Hz
Multiple hits
(1s duration:
10 hits)
Single hit,
9 cycles
Impulse
Discharge Current
8/20µs
10 hits (5 hits
each polarity)
Capacitance
UL Rating
UL1449
#E332226
Part Number
@ 100 V/µs
1 hit
@ 1MHz
GTCA28-801M-R05
GTCA28-102M-R03
GTCA28-122M-R03
GTCA28-152L-R03
GTCA28-212M-R03
GTCA28-242M-R03
GTCA28-252M-R03
GTCA28-272L-R03
GTCA28-302M-R03
GTCA28-312L-R03
GTCA28-362M-R03
GTCA28-402M-R03
Note:
Insulation resistance:
*
†
‡
800
1000
1200
1500
(± 15%)
2100
2400
2500
2700
(± 15%)*
3000
3100
(± 15%)*
3600
4000
1400
1700
1900
2200
2700
3300
3500
3700
4000
3700
‡
4600
5000
300 times
N/A
N/A
N/A
N/A
N/A
N/A
300 times
†
N/A
300 times
†
N/A
N/A
5A
1A
1A
1A
1A
1A
1A
N/A
1A
N/A
1A
1A
N/A
5A
5A
5A
5A
5A
5A
N/A
5A
N/A
5A
5A
5kA
3kA
3kA
3kA
3kA
3kA
3kA
3kA
3kA
3kA
3kA
3kA
N/A
10kA
10kA
10kA
10kA
10kA
10kA
10kA
10kA
10kA
10kA
10kA
<1pF
<1pF
<1pF
<1pF
<1pF
<1pF
<1pF
<1pF
<1pF
<1pF
<1pF
<1pF
10,000MΩ (all parts measured @ 1000V
DC
, except 800V/1000V/1200V @250V
DC
; 1500V/2100V @ 500V
DC
)
DC Sparkover Voltage measured at 5kV/s
Measured with 8/20µs,100A impulse
Measured at 1000V/us
Table G3
Device Voltage Ratings, Surge Rating, Capacitance, Insulation Resistance, and
Agency Approval for Three Electrode Gas Discharge Tubes
10
DC
Sparkover
Voltage
(A-E) (B-E)
@ 100V/s
± 20%
Tolerance
Impulse
Sparkover Voltage
(A-E) (B-E)
DC
Holdover
Voltage
On-State
Voltage
Nominal
(@1A)
(V)
Impulse
Discharge
Current
(A+B-E)
Impulse
Life
(A+B-E)
AC Discharge
Current
(1sec duration;
10 hits)
(A+B-E)
Capacitance
Insulation
Resistance
UL Rating
Part Number
@ 100V/µs
@ 1kV/µs
Per
ITU K.12
8x20µs
10 hits
10x1000µs
300 hits
@ 50 Hz
@ 1MHz
@ 100V
DC
*
UL497B
#E179610
75
GTCX35-XXXM-R05
90
140
150
GTCX36-XXXM-R05
200
230
250
260
GTCX36-XXXM-R10
300
350
400
GTCX37-XXXM-R10
420
470
500
GTCX38-XXXM-R10
550
600
450
450
500
500
600
600
600
700
800
900
900
900
1050
1100
1300
1300
550
550
600
600
700
700
700
800
900
1000
1000
1000
1150
1200
1400
1400
<52
<52
<80
<80
<135
<135
<135
<135
<150
<150
<150
<150
<150
<150
<150
<150
20
20
20
20
20
20
20
20
10kA
20
20
20
20
20
20
20
20
10kA
200A
10Arms
<1pF
10,000 (MΩ)
All Devices
10kA
200A
10Arms
<1pF
10,000 (MΩ)
All Devices
200A
10Arms
<1pF
10,000 (MΩ)
All Devices
5kA
200A
5Arms
<1pF
10,000 (MΩ)
All Devices
5kA
100A
5Arms
<1pF
10,000 (MΩ)
All Devices
* Insulation resistance measured at 50V for devices less than 150V.
Insulation resistance measured at 250V for devices more than 500V.
RoHS Compliant, ELV Compliant
HF
Halogen Free
65
Figure G3-G11 Dimensions for Gas Discharge Tubes
Figure G3 Two Electrode 3mm Product Dimensions
Surface-mount
(GTCS23-XXXM-R01)
Pad Layout - Surface-mount Devices
(GTCS23-XXXM-R01)
ø3
.0
X
3.0 ± 0.2
X
Y
Nom.
2.0
(0.079)
Z1
Nom.
2.0
(0.079)
Z2
Nom.
2.0
(0.079)
Nom.
mm
in*
Z1
Y
Z2
3.0
(0.118)
1.0
1.0
3.0 ± 0.2
* The dimensions in inches are rounded approximations.
4.5 ± 0.2
Chip GDT
(GTCC23-XXXM-R01)
Pad Layout - Chip GDT Devices
(GTCC23-XXXM-R01)
2.7 ± 0.2
X
X
Y
Nom.
2.7
(0.106)
Z1
Nom.
2.0
(0.079)
Z2
Nom.
2.0
(0.079)
Nom.
mm
3.5
(0.138)
in*
0.5
0.5
4.5 ± 0.3
3.2 ± 0.2
Z1
Y
Z2
* The dimensions in inches are rounded approximations.
Figure G4 Two Electrode 5mm Product Dimensions
Axial Leads
(GTCA25-XXXM-R02)
No Leads
(GTCN25-XXXM-R02)
†
5.00 ± 0.15
(0.197 ± 0.006)
Surface-mount
(GTCS25-XXXM-R02)
5.0 ± 0.2
(0.197 ± 0.008)
0.5
(0.020)REF
4.4 ± 0.2
(0.173 ± 0.008)
5.0 ± 0.2
(0.197 ± 0.008)
5
10
60.0 ± 4.0
(2.364 ± 0.158)
5.00 ± 0.15
(0.197 ± 0.006)
ø0.8
(0.032)REF
5.0 ± 0.2
(0.197 ± 0.008)
5.0 ± 0.2
(0.197 ± 0.008)
Pad Layout - Surface-mount Devices
(GTCS25-XXXM-R02)
Y
X
X
Y
Nom.
3.9
(0.154)
Z
Nom.
1.3
(0.051)
Nom.
mm
in*
Z
6.0
(0.197)
* The dimensions in inches are rounded approximations.
† Parts with no leads are not solderable and are meant for insertion into magazine clips.
66
RoHS Compliant, ELV Compliant
HF
Halogen Free
Gas Discharge Tubes
Figure G3-G11 Dimensions for Gas Discharge Tubes
Figure G5 Two Electrode 6mm Product Dimensions
Axial Leads
(GTCA26-XXXM-R05)
62.0 ± 2.0
(2.441 ± 0.079)
ø6.0 ± 0.2
(0.236 ± 0.008)
Cont’d
No Leads
(GTCN26-XXXM-R05)
†
ø6.0 ± 0.2
(0.236 ± 0.008)
Surface-mount
(GTCS26-XXXM-R05)
ø6.0 ± 0.2
(0.236 ± 0.008)
ø0.8
(0.032)REF
4.2 ± 0.2
(0.165 ± 0.008)
4.2 ± 0.2
(0.165 ± 0.008)
4.2 ± 0.2
(0.165 ± 0.008)
0.6
(0.024)REF
6.2 ± 0.2
(0.244 ± 0.008)
6.2 ± 0.2
(0.244 ± 0.008)
4
8.2 ± 0.2
(0.323 ± 0.008)
Pad Layout - Surface-mount Devices
(GTCS26-XXXM-R05)
Y
X
Nom.
X
Y
Nom.
3.7
(0.146)
Z
Nom.
1.3
(0.051)
mm
in*
Z
7.0
(0.276)
* The dimensions in inches are rounded approximations.
† Parts with no leads are not solderable and are meant for insertion into magazine clips.
X
Figure G6 Two Electrode 8mm Product Dimensions
Axial Leads
(GTCA28-XXXM-R05, R10 & R20)
62.0 ± 4.0
(2.441 ± 0.157)
ø8.0 ± 0.2
(0.315 ± 0.008)
No Leads
(GTCN28-XXXM-R05, R10 & R20)
†
ø8.0 ± 0.2
(0.315 ± 0.008)
Surface-mount
(GTCS28-XXXM-R05, R10 & R20)
ø8.0 ± 0.2
(0.315 ± 0.008)
10
ø0.8
(0.032)REF
6.0 ± 0.2
(0.236 ± 0.008)
0.5
(0.02)REF
6.0 ± 0.2
(0.236 ± 0.008)
6.0 ± 0.2
(0.236 ± 0.008)
0.5
(0.02)REF
8.2 ± 0.2
(0.323 ± 0.008)
6
Pad Layout - Surface-mount Devices
(GTCS28-XXXM-R05, R10 & R20)
Y
X
X
Y
Nom.
5.6
(0.22)
Z
Nom.
1.2
(0.047)
Nom.
mm
in*
Z
9.0
(0.354)
* The dimensions in inches are rounded approximations.
† Parts with no leads are not solderable and are meant for insertion into magazine clips.
Figure G7 Two Electrode 8mm High Voltage Product Dimensions
Axial Leads
(GTCA28-XXXM-R0X)
ø0.8
ø8 ± 0.2
6 ± 0.2
62 ± 4
RoHS Compliant, ELV Compliant
HF
Halogen Free
67
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