Surface Mount 2-Electrode Gas Discharge Tube (GDT)
UN1812 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.
The 1812 series GDT offers high surge ratings in a miniature
package. It’s designed for surface mounting on PCB with small size
4.5x3.2x2.7mm. Low insertion loss is perfectly suited to broadband
equipment applications. The capacitance does not vary with
voltage, and will not cause operational problems with ADSL2+,
where capacitance variation across Tip and Ring is undesirable.
These devices are extremely robust and are able to divert a 500A
pulse in a miniature package 1812 without destruction.
Schematic Symbol
Features
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Non-Radioactive
RoHS compliant
Ultra low capacitance (<1.0 pF)
UL recognized
Excellent response to fast rising transients
2KA surge capability tested with 8/20μs
pulse as defined by IEC 61000-4-5
Square Outline
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E341061
Product Characteristics
Materials
Product Marking
Dull Tin-plated
Without
-40 to +90°C
~180mg
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
General telecom equipment
ESD protection
Storage and
Operational
Temperature
Weight
UN Semiconductor Co., Ltd.
Revision
October 18, 2013
www.unsemi.com.tw
1/4
@ UN Semiconductor Co., Ltd. 2013
Specifications are subject to change without notice.
Please refer to www.unsemi.com.tw for current information.
Surface Mount 2-Electrode Gas Discharge Tube (GDT)
UN1812 Series
Device Dimensions
(Unit: mm)
Recommended pad outline
Electrical Characteristics
Nominal
Impulse
Discharge
Current
@8/20μs
±5
times
2 KA
2 KA
2 KA
2 KA
2 KA
2 KA
2 KA
2 KA
2 KA
Part Number
DC
Spark-over
Voltage
Maximum Impulse
Spark-over Voltage
Minimum
Insulation
Resistance
Maximum
Capacitance
Arc
Voltage
@100V/S
UN1812-90CSMD
UN1812-150CSMD
UN1812-200CSMD
UN1812-230CSMD
UN1812-300CSMD
UN1812-350CSMD
UN1812-400CSMD
UN1812-470CSMD
UN1812-600CSMD
Notes:
@100V/μs
600V
600V
600V
600V
800V
800V
900V
900V
1100V
@1KV/μs
700V
700V
750V
750V
900V
900V
1000V
1000V
1200V
1 GΩ
(at 50V DC)
1 GΩ
(at 50V DC)
1 GΩ
(at 100V DC)
1 GΩ
(at 100V DC)
1 GΩ
(at 100V DC)
1 GΩ
(at 100V DC)
1 GΩ
(at 100V DC)
1 GΩ
(at 100V DC)
1 GΩ
(at 100V DC)
@1MHz
1.0pF
1.0pF
1.0pF
1.0pF
1.0pF
1.0pF
1.0pF
1.0pF
1.0pF
@1A
~15V
~15V
~15V
~15V
~15V
~15V
~15V
~15V
~15V
90V±20%
150V±20%
200V±20%
230V±20%
300V±20%
350V±20%
400V±20%
470V±20%
600V±20%
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
UN Semiconductor Co., Ltd.
Revision
October 18, 2013
www.unsemi.com.tw
2/4
@ UN Semiconductor Co., Ltd. 2013
Specifications are subject to change without notice.
Please refer to www.unsemi.com.tw for current information.
Surface Mount 2-Electrode Gas Discharge Tube (GDT)
UN1812 Series
Electrical Rating
Item
DC Spark-over Voltage
Impulse Spark-over
Voltage
Insulation Resistance
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.
Requirement
Capacitance
To meet
the specified
value
Nominal Impulse
Discharge Current
Recommended soldering profile
Reflow Condition
-Temperature Min (T
s(min)
)
T
P
Ramp-up
Critical Zone
T
L
to T
P
Pb - Free assembly
150°C
200°C
60 -180 Seconds
3°C/second max
5°C/second max
217°C
60 -150 Seconds
260 +0/-5°C
of
actual
peak
10 - 30 Seconds
6°C/second max
8 minutes Max
260°C
Pre Heat
-Temperature Max (T
s(max)
)
- Time (min to max) (t
s
)
T
L
T
S(max)
Temperature
Ramp-down
Average ramp up rate ( Liquidus Temp T
L
)
to peak
T
S(max)
to TL - Ramp-up Rate
Reflow
- Temperature (T
L
) (Liquidus)
- Time (min to max) (t
s
)
Peak Temperature (T
P
)
T
S(min)
Preheat
25
Time to peak temperature
(t 25℃ to peak)
Time
Time within 5°C
Temperature (t
p
)
Ramp-down Rate
Time 25°C to peak Temperature (T
P
)
Do not exceed
UN Semiconductor Co., Ltd.
Revision
October 18, 2013
www.unsemi.com.tw
3/4
@ UN Semiconductor Co., Ltd. 2013
Specifications are subject to change without notice.
Please refer to www.unsemi.com.tw for current information.
Surface Mount 2-Electrode Gas Discharge Tube (GDT)
UN1812 Series
Part Numbering
UN1812
–
XXX C SMD
SMD,
Surface Mount
C, 2KA
8/20μs Level
Nominal DC Spark-over Voltage
150 = 150V
200 = 200V
350 = 350V
400 = 400V
Series
Tape and Reel Dimensions
Unit: mm
Packaging
Part Number
UN1812-XXXCSMD
Description
12mm Tape & 13″ Reel
Quantity
2500
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.
UN Semiconductor Co., Ltd.
Revision
October 18, 2013
www.unsemi.com.tw
4/4
@ UN Semiconductor Co., Ltd. 2013
Specifications are subject to change without notice.
Please refer to www.unsemi.com.tw for current information.
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