Gas Discharge Tubes
SG Series
SG Series
Description
RoHS
Littelfuse SG 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 1000A pulse without
destruction.
Features
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E128662
2 Electrode GDT Graphical Symbol
• RoHS compliant and
Lead-free
• GHz working frequency
• Excellent stability on
multiple pulse duty cycle
• Excellent response to
fast rising transients.
• Ultra Low Insertion Loss
• 1-2KA surge capability
tested with 8/20μS
pulse as defined by IEC
61000-4-5
Applications
• Ultra small devices
offered in a variety of
mounting lead forms
• Non-Radioactive
• Low capacitance (<1pF)
• Voltage Ranges 75V to
600V
• UL recognized
• Conforms to ITU-T K12,
IEC 1000-4-5
• Square Outline
Additional Information
•
Communication
Datasheet
Resources
Samples
•
•
•
•
•
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
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/12/17
Gas Discharge Tubes
SG Series
Electrical Characteristics
Device Specifications
(at 25°C)
Life Ratings
Part
Number
MIN TYP MAX
SG75
52 75
98
SG90
63 90 117
SG150
105 150 195
SG200
SG230
SG300
SG300Q
SG350
SG350Q
SG400
SG420
SG420Q
SG450Q
SG500Q
SG600Q
140 200 260
172
225
210
263
263
300
315
315
370
400
450
230
300
300
350
350
400
420
420
450
500
600
288
375
390
437
437
500
525
525
500
600
750
DC Breakdown Impulse
Impulse
Insulation Capaci-
Arc
Glow
Glow Nominal Nominal Nominal
in Volts
Breakdown Breakdown Resistance tance Voltage
to Arc
Voltage
AC
Impulse Impulse
in Volts
In Volts
Transition
Discharge Discharge Discharge
(@100V/s)
(@1MHz)
(@1A)
Current
Current
Current
(@100V/µs)
(@1 Kv/µsec)
Current
(x10 @50Hz)
MAX
MIN
MAX
(x10 @8/20µs)
(10/1000µs
100 cycles)
500
500
500
550
650
700
580
750
600
800
800
650
680
950
1100
650
600
600
700
800
850
650
900
700
950
1000
750
750
1050
1200
>1GΩ
(at 50VDC)
>1GΩ
(at 100VDC)
~10 V
<1 pf
~12 V
~20 V
>1GΩ
(at 50VDC) <0.8 pf
~12 V
~10 V
~20 V
~20 V
~16 V
~20 V
~0.5 A
~0.8 A
~0.5 A
~90 V
~140 V
~90 V
~140 V
~90 V
~60 V
~1.0 A
~60 V
2A
2.5 A
2A
NA*
2A
NA*
2A
2A
NA*
1A
2A
2kA
10 A
1kA
<1 pf
>1GΩ
<0.5 pf
(at 100VDC)
<1 pf
<1.0 A
~0.1 A
<0.5 A
~140 V
* Specification is not applicable for quick response (SGxxxQ) version of product
Product Characteristics
Materials
Storage and
Operational
Temperature
Device Tin Plated 17
.5±12.5 Microns
Construction Ceramic Insulator.
-40 to +90 °C
Voltage vs. Time Characteristic
Max dynamic breakover
voltage
Typical Insertion Loss
@ 1.0 GHz = 0.01 dB
@ 1.4GHz = 0.1 dB
@ 1.8 GHz = 0.53 dB
@ 2.1 GHz = 0.81 dB
@ 2.45 GHz= 1 dB
@ 2.8 GHz = 1.2 dB
@ 3.1 GHz = 1.5 dB
@ 3.5 GHz = 2.1 dB
0
200
400
600
Time (ns)
Voltage
(V)
Hold-over voltage
On-State voltage
800
1000
1200
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/12/17
Gas Discharge Tubes
SG Series
Soldering Parameters - Reflow Soldering (Surface Mount Devices)
Reflow Condition
- Temperature Min (T
s(min)
)
Pre Heat
- Temperature Max (T
s(max)
)
- Time (Min to Max) (t
s
)
Average ramp up rate (Liquidus Temp
(T
L
) to peak
T
S(max)
to T
L
- Ramp-up Rate
Reflow
- Temperature (T
L
) (Liquidus)
- Temperature (t
L
)
Pb – Free assembly
150°C
60 – 180 secs
3°C/second max
5°C/second max
217°C
60 – 150 seconds
260
+0/-5
T
P
Ramp-up
t
P
Critical Zone
T
L
to T
P
Temperature
200°C
T
L
T
S(max)
T
S(min)
Preheat
t
L
Ramp-down
t
S
25
time to peak temperature
(t 25ºC to peak)
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
°C
10 – 30 seconds
6°C/second max
8 minutes Max.
260°C
Device Dimensions
Device Marking
Dimensions in Millimeters.
Type Production
Code Year Code
(last digit)
3.2
+/- 0.3
0.5
+/- 0.1
4.5
+/- 0.3
2.7
+/- 0.3
A3A
Production
Month Code
Type Code
Month Code
A
B
C
D
E
F
G
H
I
J
K
L
January
February
March
April
May
June
July
August
September
October
November
December
A
B
C
D
SG75
SG90
SG150
SG230
SG300
SG300Q
SG350
SG350Q
SG400
SG420
SG420Q
SG450Q
SG500Q
SG600Q
SG200
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/12/17
5.2
2.8
4
Recommended Soldering Pad Layout
E
F
G
H
I
J
K
L
M
N
O
Gas Discharge Tubes
SG Series
Tape and Reel Dimensions
(IEC 60286-3, dimension in mm)
Tape Specifications
IEC 60286-3
Dimensions in mm
section
A-A
0.4
±0.05
section
B-B
Part Numbering System and Ordering Information
5°
SG xxx Q
Series
Square GDT
1.75
±0.1
A
2
±0.1
4
±0.10
Ø 1.55
±0.05
Ø 1.6
±0.1
Breakdown Voltage
75 = 75V
90 = 90V
150 = 150V
200 = 200V
230 = 230V
300 = 300V
350 = 350V
400 = 400V
420 = 420V
450 = 450V
(Not available without “Q” suffix)
500 = 500V
(Not available without “Q” suffix)
600 = 600V
(Not available without “Q” suffix)
4.9
±0.1
5°
12
0
5.5
±0.1
+0.3
B
R0.5 typical
B
3.65
±0.1
8
±0.1
3
±0.1
A
SMD-Tape has to withstand
a minimum Force of
F > 20 N / pocket
2 Kg / pocket
minimum vertical load
(minimum checking
quantity:10 pockets)
Device Option Code
(Blank) = Standard device
Q
= Quick Response Version
(300V, 350V, 420V, 450V,
500V, 600V only)
Packaging
Reel Specifications
IEC 60286-3
Dimensions in mm
Part Number and Device Type
SGxxx
Surface mount
Quantity and Packaging
Description
2000pcs/reel in tape and reel
1.5 min.
12.8 min.
R0.75
18.4 max.
12.4 +2/-0
11.9 min.
Disclaimer Notice -
Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and
test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete
Disclaimer Notice at:
www.littelfuse.com/disclaimer-electronics.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/12/17
Ø330 max.
20.2 min.
Ø100 min.
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