Raychem 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.
Raychem 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, SiBar thyristor surge
protection devices, and MOV (Metal Oxide Varistor)
devices, they can help equipment manufacturers meet
stringent safety regulatory standards.
Benefits
• Helps provide overvoltage fault protection against high
energy surges
• Suitable for 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-600V)
• 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
Applications
• Telecommunications
- MDF modules, xDSL equipment, RF system protection,
antenna, base stations
• Industrial and Consumer electronics, such as
- Power supplies, surge protectors, alarm systems,
irrigation systems
Figure G1 Two electrode devices for ungrounded circuits
PolySwitch Device
Figure G2 Three electrode devices for grounded circuits
P PolySwitch Device
(A)
(A’)
(A)
(A’)
Telecom
Line
G
GDT
P
Protected
Equipment
Telecom
Line
GDT
Protected
Equipment
(B)
SiBar
(B’)
Device
(B)
SiBar
PolySwitch Devices
Device
(B’)
RoHS Compliant, ELV Compliant
HF
Halogen Free
-1-
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
* Rounded off approximation
4.5 ± 0.2
Figure G4 Two Electrode 5mm Product Dimensions
Axial Leads
(GTCA25-XXXM-R02)
60.0 ± 4.0
(2.364 ± 0.158)
5.00 ± 0.15
(0.197 ± 0.006)
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
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)
* Rounded off approximation
† Parts with no leads are non-solderable; meant for insertion into magazine clips
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)
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
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)
* Rounded off approximation
† Parts with no leads are non-solderable; meant for insertion into magazine clips
RoHS Compliant, ELV Compliant
HF
Halogen Free
-3-
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)
8.2 ± 0.2
(0.323 ± 0.008)
8.2 ± 0.2
(0.323 ± 0.008)
6
3
1
ø5.0 ± 0.2
(0.197 ± 0.008)
7.6 ± 0.2
(0.299 ± 0.008)
7.6 ± 0.2
(0.299 ± 0.008)
ø0.8
(0.032)
3X 30.0 ± 2.0
(1.182 ± 0.079)
ø8.0 ± 0.2
(0.315 ± 0.008)
6.0 ± 0.2
(0.236 ± 0.008)
0.5
(0.02)REF
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)
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)
* Rounded off approximation
† Parts with no leads are non-solderable; meant for insertion into magazine clips
Figure G7 Three Electrode 5mm Product Dimensions
Axial Leaded
(GTCA35-XXXM-R05)
Axial Leaded with-FT
(GTCA35-XXXM-R05-FT)
No Leads
(GTCN35-XXXM-R05)†
(
+0.0
11.4 –2.0
+0.000
0.449 –0.079
7.6 ± 0.2
(0.299 ± 0.008)
)
(
+0.0
11.4 –2.0
+0.000
0.449 –0.079
)
8.3 ± 0.3
(0.327 ± 0.012)
7.6 ± 0.2
(0.299 ± 0.008)
ø5.0 ± 0.2
(0.197 ± 0.008)
ø
ø5.0 ± 0.2
(0.197 ± 0.008)
ø
12.0 ± 0.5
(0.473 ± 0.020)
4
4.5
(0.177) REF
ø0.8
(0.032)
3.8 ± 0.3
(0.151 ± 0.012)
13.0 ± 0.5
(0.512 ± 0.020)
4.5
(0.177) REF
ø0.8
(0.032)
3.8 ± 0.3
(0.151 ± 0.012)
No Leads with-FT
(GTCN35-XXXM-R05-FT)†
8.3 ± 0.3
(0.327 ± 0.012)
Surface-mount
(GTCS35-XXXM-R05)
1.6
(0.063)REF
T Leaded
(GTCT35-XXXM-R05)
ø5.0 ± 0.2
(0.197 ± 0.008)
ø MAX 5.9
(0.232)
0.4
(0.016) REF
7.6 ± 0.2
7
(0.299 ± 0.008)
7.6 ± 0.2
(0.299 ± 0.008)
ø5.0 ± 0.2
(0.197 ± 0.008)
ø5.0 ± 0.2
(0.197 ± 0.008)
ø5.0 ± 0.2
(0.197 ± 0.008)
Pad Layout - Surface-mount Devices
(GTCS35-XXXM-R05)
Y1
Y2
X
NOM
X
Y1
NOM
3.6
(0.142)
Y2
NOM
3.6
(0.142)
Z1
NOM
2.5
(0.098)
Z2
NOM
1.3
(0.051)
ø
mm
in*
Z1
Z2
6.0
(0.236)
* Rounded off approximation
† Parts with no leads are non-solderable; meant for insertion into magazine clips
RoHS Compliant, ELV Compliant
HF
Halogen Free
-4-
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