3-Electrode Gas Discharge Tube (GDT)
UN3E7 Series
Description
Gas discharge Tubes (GDT) are classical components for
protecting the installations of the telecommunications. It is
essential that IT and telecommunications systems -with their
high-grade but sensitive electronic circuits - be protected by
arresters. They are thus fitted at the input of the power supply
system together with varistors and at the connection points to
telecommunication lines. They have become equally indispensable
for protecting base stations in mobile telephone systems as well as
extensive cable television (CATV) networks with their repeaters
and distribution systems.
These protective components are also indispensable in other
sectors, In AC power transmission systems, they are often used
with current-limiting varistors, In customer premises equipment
such as DSL modems, WLAN routers, TV sets and cable modems
In air-conditioning equipment, the integral black-box concept offers
graduated protection by combining arresters with varistors, PTC,
diodes and inductor.
e
a
b
a = Tip
b = Ring
e = Ground
(center electrode)
UN3E7-XXXHM
UN3E7-XXXH
Schematic Symbol
Features
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Non-Radioactive
RoHS compliant
Low insertion loss
Excellent response to fast rising transients
Ultra low capacitance
10KA surge capability tested with 8/20μs
pulse as defined by IEC 61000-4-5
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E341061
Product Characteristics
Materials
Nickel-plated with Tinplated wires
Applications
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Communication equipment
CATV equipment
Test equipment
Data lines
Power supplies
Telecom SLIC protection
Broadband equipment
ADSL equipment, including ADSL2+
XDSL equipment
Satellite and CATV equipment
Consumer electronics
Product Marking
UNION
XXXH
XXX
M
-Nominal voltage
-20KA
Glow to Arc
Transition Current
Glow Voltage
Storage and
Operational
Temperature
Weight
Climatic category
(IEC 60068-1)
~1 Amps
~70 Volts
-40 to +90°C
UN3E7-XXXHM
UN3E7-XXXH
40/ 90/ 21
~2.3g
~2.1g
SOCAY Electronics Co., Ltd.
Revision
March 6, 2014
www.socay.com
1/4
@SOCAY Electronics Co., Ltd. 2014
Specifications are subject to change without notice.
Please refer to www.socay.com for current information.
3-Electrode Gas Discharge Tube (GDT)
UN3E7 Series
Dimensions
(Unit: mm)
Radial Leaded Devices (UN3E7-XXXHM)
Without wire Devices (UN3E7-XXXH)
Electrical Characteristics
Service Life
DC Spark-over
Voltage
Part Number
Marking
Maximum Impulse
Spark-over Voltage
Maximum
Capacitance
Arc
Voltage
Nominal
Impulse
Discharge
Current
@8/20μs
4)
±5
times
Nominal
Max Impulse
Alternating
Discharge
Discharge
Current
Current
@8/20μs
4)
1 time
@50Hz
4)
1 Sec
10 times
Minimum
Insulation
Resistance
Impulse Life
@100V/S
@100V/μs
@1KV/μs
@1MHz
@1A
@10/1000μs
4)
300 times
UN3E7-75HM
UN3E7-75H
UN3E7-90HM
UN3E7-90H
UN3E7-150HM
UN3E7-150H
UN3E7-230HM
UN3E7-230H
UN3E7-250HM
UN3E7-250H
UN3E7-350HM
UN3E7-350H
UN3E7-470HM
UN3E7-470H
UN3E7-600HM
UN3E7-600H
UN3E7-800HM
UN3E7-800H
Notes:
UNION
75H
UNION
90H
UNION
150H
UNION
230H
UNION
250H
UNION
350H
UNION
470H
UNION
600H
UNION
800H
75V±20%
90V±20%
150V±20%
230V±20%
250V±20%
350V±20%
470V±20%
600V±20%
800V±20%
＜500V
＜500V
＜500V
＜600V
＜600V
＜800V
＜900V
＜600V
＜600V
＜600V
＜700V
＜700V
＜900V
＜1000V
1 GΩ
(at 25V)
1 GΩ
(at 50V)
1 GΩ
(at 50V)
1 GΩ
(at 100V)
1 GΩ
(at 100V)
1 GΩ
(at 100V)
1 GΩ
(at 100V)
1 GΩ
(at 100V)
1 GΩ
(at 100V)
＜1.5pF
＜1.5pF
＜1.5pF
＜1.5pF
＜1.5pF
＜1.5pF
＜1.5pF
＜1.5pF
＜1.5pF
~15V
~15V
~25V
~25V
~25V
~25V
~25V
~25V
~25V
20KA
20KA
20KA
20KA
20KA
20KA
20KA
20KA
20KA
25KA
25KA
25KA
25KA
25KA
25KA
25KA
25KA
25KA
20A
20A
20A
20A
20A
20A
20A
20A
20A
200A
200A
200A
200A
200A
200A
200A
200A
200A
＜1100V ＜1200V
＜1200V ＜1400V
1). Terms in accordance with ITU-T K.12 and GB/T 9043-2008
2). At delivery AQL 0.65 level
Ⅱ,
DIN ISO 2859
3). Tip or ring electrode to center electrode
4). Total current through center electrode, half value through tip respectively ring electrode
SOCAY Electronics Co., Ltd.
Revision
March 6, 2014
www.socay.com
2/4
@SOCAY Electronics Co., Ltd. 2014
Specifications are subject to change without notice.
Please refer to www.socay.com for current information.
3-Electrode Gas Discharge Tube (GDT)
UN3E7 Series
Electrical Rating
Item
DC Spark-over Voltage
Impulse Spark-over
Voltage
Insulation Resistance
Capacitance
Test Condition / Description
The voltage is measured with a slowly rate of rise dv / dt=100V/s
The maximum impulse spark-over voltage is measured with a rise time of
dv / dt=100V//μs or 1KV/μs
The resistance of gas tube shall be measured each terminal each other terminal,
please see above spec.
The capacitance of gas tube shall be measured each terminal to each other
terminal.
Test frequency :1MHz
The maximum current applying a waveform of 8/20μs that can be applied across
the terminals of the gas tube. One hour after the test is completed, re-testing of the
DC spark-over voltage does not exceed
±30%
of the nominal DC spark-over
voltage. Dwell time between pulses is 3 minutes.
I
1.0
0.9
Requirement
To meet
the specified
value
Nominal Impulse
Discharge Current
0.5
0.1
0.0
8μsec
20μsec
30% Max
T
Nominal Alternating
Discharge Current
Rated RMS value of AC current at 50Hz, 1 sec. 10 times. Intervals: 3min. The DC
spark-over voltage does not exceed
±30%
of the nominal DC spark-over voltage.
8
IR > 10 ohms.
Recommended soldering profile
Wave soldering
Reflow soldering
Soldering profile applied a single process
Soldering Parameters - Hand Soldering
Solder Iron Temperature: 350°C +/-5°C
Heating Time: 5 seconds max.
SOCAY Electronics Co., Ltd.
Revision
March 6, 2014
www.socay.com
3/4
@SOCAY Electronics Co., Ltd. 2014
Specifications are subject to change without notice.
Please refer to www.socay.com for current information.
3-Electrode Gas Discharge Tube (GDT)
UN3E7 Series
Part Numbering
UN3E7
–
XXX H M
M,
No,
with wire
without wire
H, 20KA
8/20μs Level
Nominal DC Spark-over Voltage
75 = 75V
350=350V
90 = 90V
470=470V
150 = 150V
600=600V
230 = 230V
800=800V
Series
Packaging
Part Number
UN3E7-XXXHM
UN3E7-XXXH
Description
100PCS per Tray, 10 Trays / Inner Carton
100PCS per Tray, 10 Trays / Inner Carton
Quantity
1000
1000
Tray Dimension (Unit: mm)
Cautions and warnings
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Gas discharge tubes (GDT) must not be operated directly in power supply networks.
Gas discharge tubes (GDT) may become hot in case of longer periods of current stress (danger of burning).
Gas discharge tubes (GDT) may be used only within their specified values. In the event of overload, the head contacts may
fail or the component may be destroyed.
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Damaged Gas discharge tubes (GDT) must not be re-used.
SOCAY Electronics Co., Ltd.
Revision
March 6, 2014
www.socay.com
4/4
@SOCAY Electronics Co., Ltd. 2014
Specifications are subject to change without notice.
Please refer to www.socay.com for current information.
