Gas Discharge Tubes(GDT)
Description
Gas discharge tubes (GDT) use noble gasses enclosed in
ceramic tubes to provide an alternate circuit path for voltage
spikes. The ceramic envelope and with nickel connectors
allow for high loads. SMD4042 Gas Discharge Tubes
(GDT) series has a surge rating of 3kA, 8/20μs.Offered in a
Squared Surface Mount package, which helps to make pick
and place on PCB process easier.
This GDT series is perfectly suited for broadband
equipment applications. The GDT’s low off-state
capacitance is compatible with high bandwidth applications
and this capacitance loading value does not vary if the
voltage across the GDT changes.
SMD4042 Gas Discharge Tube (GDT) series are
specifically designed for protection of electrical, multimedia,
and communication equipment against over voltage
transients in surface mount assembly applications.
SMD4042 Series
Electrical symbol
Features
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Excellent response to fast rising transients
Stable breakdown voltage
GHz working frequency
8/20μs Impulse current capability:3KA
Surface Mount package
Non-Radioactive
Ultra Low capacitance (<0.8pF)
Lead-free and RoHS compliant
Size: 4.0mm*4.2mm*4.2mm
Storage and operational temperature: -40~+90°C
Applications
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CATV equipment
Antennas
RS 485
Telecom Base Station
Power Supply AC Main
EV power Charging
Inverter/Variable
Frequency Drivers
(VFDs)
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IEEE 802.3 compliant
Ethernet interfaces
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Broad Band equipment
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xDSL, ADSL, ADSL2,
VDSL, and VDSL2
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Medical Electronics
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Test Equipment
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General Telecom
Equipment
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Renewable Energy
Part Number Code
S
M
D
4
0
4
2
-
x
x
x
E
Surface Mount Package
Product Series
Size: 4.0mm*4.2mm*4.2mm
DC Spark-over Voltage
8/20μs Impulse Current
E: 3KA
Specifications are subject to change without notice.
Please refer to http://
www.ruilon.com.cn
for current information.
Revised: 2017-04-25
Page:1
Gas Discharge Tubes(GDT)
Electrical Characteristics
Impulse Spark-over Insulation
Capacitance
DC
Voltage
Resistance
@1MHz
Spark-over
3)
1) 2)
Voltage
100V/μS 1KV/μS
@100V/S
Max
Max
Min
Max
V
SMD4042-075E
SMD4042-090E
SMD4042-150E
SMD4042-200E
SMD4042-230E
SMD4042-300E
SMD4042-350E
SMD4042-400E
SMD4042-470E
SMD4042-600E
75±20%
90±20%
150±20%
200±20%
230±20%
300±20%
350±20%
400±20%
470±20%
600±20%
V
500
500
500
600
600
750
800
850
900
1100
V
600
600
600
700
700
850
900
950
1000
1200
GΩ
1
1
1
1
1
1
1
1
1
1
~60V
~10V
~0.5A
~0.28g
-40~90°C
40/090/21
Without
Matte-tin plated
pF
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
SMD4042 Series
Life Ratings
Impulse Discharge
Current
@8/20μS
Nominal
±5
times
KA
3
3
3
3
3
3
3
3
3
3
Max
1 time
KA
5
5
5
5
5
5
5
5
5
5
AC Discharge Impulse Life
Current
@10/1000μS
@50Hz 1S
100A
Nominal
5 times
A
3
3
3
3
3
3
3
3
3
3
Min
Times
50
50
50
50
50
50
50
50
50
50
Part Number
Glow Voltage at 10mA.................................................................
Arc Voltage at 1A.........................................................................
Glow to Arc transition Current……………………………………...
Weight………………………………………………………………...
Operation and storage temperature……………………………….
Climatic category (IEC 60068-1)…………………………………..
Marking……………………………………………………………….
Surface treatment…………………………………………..............
1)
2)
3)
At delivery AQL 0.65 level II, DIN ISO 2859
In ionized mode
Insulation Resistance Measuring Voltage:
75V at DC 25V
90V~150V at DC 50V
Other at DC 100V
Terms in accordance with ITU-T Rec. K.12, IEC 61643-311, GB/T 9043.
Specifications are subject to change without notice.
Please refer to http://
www.ruilon.com.cn
for current information.
Revised: 2017-04-25
Page:2
Gas Discharge Tubes(GDT)
Dimensions
Symbol
A
B
C
D
X
X1
Y
SMD4042 Series
Millimeters
4.2±0.2
4.2±0.2
4.0±0.2
0.5±0.1
1.3
3.6
5.0
Inches
0.165±0.008
0.165±0.008
0.157±0.008
0.020±0.004
0.051
0.142
0.197
Recommended Soldering Pad Layout
Taping and Reel Specifications
Symbol
W
A0
B0
K0
P
F
SMD-tape according to IEC 60286-3
E
D
P0
P2
T
D0
D1
D2
W1
Direction of Unreeling
Millimeters
16±0.3
4.5±0.1
4.3±0.1
4.4±0.1
12±0.1
7.5±0.1
1.75±0.1
1.5+0.1/-0.0
4±0.1
2±0.1
0.4±0.1
13.3±0.15
330±2
100+1/-2
16.5±0.4
Inches
0.630±0.012
0.177±0.004
0.17±0.004
0.173±0.004
0.472±0.004
0.295±0.004
0.069±0.004
0.059+0.004/-0.0
0.157±0.004
0.079±0.004
0.016±0.004
0.524±0.006
12.992±0.079
3.937+0.039/-0.079
0.65±0.016
Packaging Quantity:
1,000 PCS per reel (13”)
3 reels per inner box
3,000 PCS per inner box
Specifications are subject to change without notice.
Please refer to http://
www.ruilon.com.cn
for current information.
Revised: 2017-04-25
Page:3
Gas Discharge Tubes(GDT)
Soldering Parameters - Reflow Soldering (Surface Mount Devices)
Reflow Condition
T
P
Ramp-up
Critical Zone
T
L
to T
P
SMD4042 Series
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
10 - 30 Seconds
6°C/second max
8 minutes Max
260°C
-Temperature Min (T
s(min)
)
Pre Heat
-Temperature Max (T
s(max)
)
- Time (min to max) (t
s
)
Ramp-down
T
L
T
S(max)
Temperature
Average ramp up rate ( Liquids Temp
T
L
) to peak
T
S(max)
to TL - Ramp-up Rate
T
S(min)
Preheat
Reflow
25
Time to peak temperature
(t 25℃ to peak)
- Temperature (T
L
)
(Liquids)
- Time (min to max) (t
s
)
Time
Peak Temperature (T
P
)
Time within 5°C of actual peak
Temperature (t
p
)
Ramp-down Rate
Time 25°C to peak Temperature (T
P
)
Do not exceed
Specifications are subject to change without notice.
Please refer to http://
www.ruilon.com.cn
for current information.
Revised: 2017-04-25
Page:4
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