BTC Series
Gas Discharge Tube
SMD1812
ROHS
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 SMD5x5 series GDT offers high surge ratings in a miniature
package. It’s designed for surface mounting on PCB with small size
5.0x5.0x4.2mm. 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 2KA
pulse in a miniature package SMD5x5 without destruction.
Features
Non-Radioactive
RoHS compliant
Ultra low capacitance (<0.8pF)
UL recognized
Excellent response to fast rising transients
5KA surge capability tested with 8/20μs
pulse as defined by IEC 61000-4-5
Square Outline
Applications
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
Device Dimensions (Unit: mm)
Recommended pad outline
1/3
BTC Series
Gas Discharge Tube
SMD1812
ROHS
Electrical Characteristics
DC
Spark-over
Voltage
Maximum Impulse
Spark-over Voltage
Minimum
Insulatio
Resistance
Maximum
Capacitance
Arc
Voltage
Nominal
Impulse
Discharge
Current
@8/20μs
±5 times
5.0KA
5.0KA
5.0KA
5.0KA
5.0KA
5.0KA
5.0KA
5.0KA
5.0KA
Part Number
@100V/S
@100V/μs
600V
600V
600V
600V
800V
800V
900V
900V
1100V
@1KV/μs
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
0.8pF
0.8pF
0.8pF
0.8pF
0.8pF
0.8pF
0.8pF
0.8pF
0.8pF
@1A
~15V
~15V
~15V
~15V
~15V
~15V
~15V
~15V
~15V
BWF900N
BWF151N
BWF201N
BWF231N
BWF301N
BWF351N
BWF401N
BWF471N
BWF601N
90V±30%
150V±20%
200V±20%
230V±20%
300V±20%
350V±20%
400V±20%
470V±20%
600V±20%
700V
750V
750V
750V
900V
900V
1000V
1000V
1200V
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 ±40% 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
2/3
BTC Series
Gas Discharge Tube
SMD1812
ROHS
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
Average ramp up rate ( Liquidus Temp T
L
)
to peak
Ramp-down
T
S(min)
Preheat
T
S(max)
to TL - Ramp-upRate
Reflow
- Temperature (T
L
) (Liquidus)
- Time (min to max) (t
s
)
Peak Temperature (T
P
)
Time to peak temperature
(t 25℃ to peak)
25
Time
Time
within
5°C
Temperature (t
p
)
Ramp-down Rate
Time 25°C to peak Temperature (T
P
)
Do not exceed
Part Numbering
BW
F – 900
N
M：20%
N: 30%
Nominal DC Spark-over Voltage 900 = 90V
8/20μs Level
F,5.0KA
BORN SMD5x5 Series
Cautions and warnings
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.
Damaged Gas discharge tubes (GDT) must not be re-used.
3/3
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