Gas Discharge Tubes
GTCX28-XXXM-R20 Series
Littelfuse Circuit Protection 8mm 2Pole GDTs
(ceramic gas discharge tubes), are commonly used
to help protect sensitive telecom equipment such as
communication lines, signal lines and data
transmission lines from damage caused by transient
surge voltages that typically result from lightning
strikes and equipment switching operations.
Littelfuse Circuit Protection GDTs offer a high level of
surge protection, low capacitance and a broad array
of breakover voltage levels, making 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.
Littelfuse Circuit Protection GDTs, can help
equipment meet the most stringent regulatory
standards.
Benefits:
Helps provide overvoltage fault protection against
high energy surges
Suitable for high-frequency applications
Features:
2Pole, 8mm devices
Broad voltage range from 75V-350V
Various form factors: surface mount, axial leads, no
leads
Low capacitance and insertion loss
UL 497B recognized
RoHS compliant
Devices tested per ITU K.12 recommendations
Non-radioactive materials
Applications
:
Telecommunications
- MDF modules, xDSL equipment, RF system
protection, antenna, base station
•
Industrial and consumer electronics, such as
- Surge protectors
- Alarm system
© 2016 Littelfuse,Inc.
Telecommunications
Specifications are subject to change without notice
Revised July 26,2016.
modules, xDSL equipment, RF sytem
1
MDF
All rights reserved.
Document:
• Industrial and consumer electronics, such as
SCD27622
Status: Released
Rev: D Date: JULY 26, 2016
Protection, antenna, pase station
GTCX26-XXXM-R05 Series
GTCX28-XXXM-R20 Series
Device Voltage Ratings and Part Marking
Part Number
DC Sparkover
@100V/s
±20% Tolerance
(V)
GTCX28-750M-R20
GTCX28-900M-R20
GTCX28-141M-R20
GTCX28-151M-R20
GTCX28-201M-R20
GTCX28-231M-R20
GTCX28-251M-R20
GTCX28-261M-R20
GTCX28-301M-R20
GTCX28-351M-R20
75
90
140
150
200
230
250
260
300
350
Impulse
Sparkover
Gas Discharge Tubes
DC Holdover
Voltage
Per ITU K.12
(<150ms)
(V)
<52
<52
<80
<80
<135
<135
<135
<135
<150
<150
On-State Voltage
Nominal
(@ 1A)
(V)
20
20
20
20
20
20
20
20
20
20
@100 V/µs (V)
450
450
500
500
600
600
600
700
800
900
@1000 V/µs (V)
550
550
600
600
700
700
700
800
900
1000
Note:X options: S: Surface-mount; A: Axial-leaded; N: No-leaded
Part Marking : XX = lot code
Device Surge Rating, Capacitance, Insulation Resistance, UL
Listing
Part Number
Impulse
Discharge
Current
8x20µs
10 hits
GTCX28-XXXM-R20
20kA
Impulse
Life
AC
Discharge
Current
(1sec duration;
10 hits)
@50 Hz
20Arms
Capacitance
Insulation
Resistance
UL
Rating
10x1000µs
300 hits
100A
@1Mhz
<1.5pF
@100V*
10,000 (MΩ)
UL497B
#E179610
All Devices
* Devices <=150V measured @ 50V;
© 2016 Littelfuse,Inc.
Specifications are subject to change without notice
Revised July 26,2016. All rights reserved.
2
Document: SCD27622
Status: Released
Rev: D Date: JULY 26, 2016
GTCX26-XXXM-R05 Series
GTCX28-XXXM-R20 Series
Product Dimensions
Gas Discharge Tubes
DIMENSIONS = MILLIMETERS [INCHES]
Surface-mount (GTCS28-XXXM-R20)
No Leads (GTCN28-XXXM-R20)
Axial Leads (GTCA28-XXXM-R20)
Pad Layout – Surface- mount Devices (GTCS28-XXXM-R20)
mm:
in*:
X
NOM
9.0
(0.354)
Y
NOM
5.6
(0.220)
Z
NOM
1.2
(0.047)
© 2016 Littelfuse,Inc.
Specifications are subject to change without notice
Revised July 26,2016. All rights reserved.
3
Document: SCD27622
Status: Released
Rev: D Date: JULY 26, 2016
GTCX26-XXXM-R05 Series
GTCX28-XXXM-R20 Series
General Characteristics
No Radioactive Material
Storage Temperature: -40ºC to +90ºC
Operating Temperature: -40ºC to +90ºC
Body: Nickel Plated
Leads: Surface-mount, Axial Devices: Tin Plated
Devices with No Leads: Nickel Plated
Gas Discharge Tubes
Soldering Note: Devices with no leads are non-solderable; meant for insertion into magazine clips
m
Packaging Information
Part Description
No Leads:
GTCN28-XXXM-R20
Axial Leads:
GTCA28-XXXM-R20
Surface-mount: GTCS28-XXXM-R20
Tape & Reel SMD part: GTCS28-XXXM-R20-2
Tray / Reel
100pcs
100pcs
100pcs
500pcs
Standard Package
2,000pcs
1,000pcs
2,000pcs
4,000pcs
Part Numbering System
Example Part Number: GTCX28-231M-R20
GT =
C=
X=
2=
8=
231 =
M=
R=
20 =
Gas Tube
Ceramic
Lead Configuration:
N=
No leads;
A=
Axial Leads;
S=
Surface-mount
2 Electrode device
8mm Diameter
DC Spark Over Voltage of 230V (at 100V/s)
Tolerance of 20% on DC Spark Over Voltage
Product Family Designator
Surge rating: 8x20µs 20kA 10 times
© 2016 Littelfuse,Inc.
Specifications are subject to change without notice
Revised July 26,2016. All rights reserved.
4
Document: SCD27622
Status: Released
Rev: D Date: JULY 26, 2016
GTCX26-XXXM-R05 Series
GTCX28-XXXM-R20 Series
Part Marking Reference
Guide
Gas Discharge Tubes
Example Part Marking:
=
23 =
R20 =
GN =
23 R20 GN
Manufacture Mark
Voltage Designator (23 = 230V)
Product Family Designator + Surge Current 20kA (8x20µs 10 hits)
Year and Week of Manufacture
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or
nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in
personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for
products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in
applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions
of Sale, unless otherwise agreed by Littelfuse.
© 2016 Littelfuse,Inc.
Specifications are subject to change without notice
Revised July 26,2016. All rights reserved.
5
Document: SCD27622
Status: Released
Rev: D Date: JULY 26, 2016
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