Document
SG Series
Gas Discharge Tubes
SG Series
RoHS
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E128662
2 Electrode GDT Graphical Symbol
Additional Information
Datasheet
Resources
Samples
Description 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
• 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
• 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
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
© 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
SG75 SG90 SG150
SG200
SG230 SG300 SG300Q SG350 SG350Q SG400 SG420 SG420Q SG450Q SG500Q SG600Q
DC Breakdown Impulse Impulse Insulation Capaci-
in Volts
Breakdown Breakdown Resistance tance
(@100V/s)
in Volts In Volts
(@1MHz)
(@100V/µs)
(@1 Kv/µsec)
MIN TYP MAX 52 75 98 63 90 117 105 150 195
140 200 260
172 230 288 225 300 375 210 300 390 263 350 437 263 350 437 300 400 500 315 420 525 315 420 525 370 450 500 400 500 600 450 600 750
MAX 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
MIN
MAX
>1GΩ (at 50VDC)
>1GΩ (at 100VDC)
<1 pf
>1GΩ (at 50VDC) <0.8 pf
<1 pf
>1GΩ (at 100VDC)
<0.5 pf
<1 pf
Arc Voltage
(@1A)
~10 V
~12 V ~20 V ~12 V ~10 V ~20 V ~20 V ~16 V ~20 V
Glow Glow Nominal Nominal Nominal
to Arc Voltage AC
Impulse Impulse
Transition
Discharge Discharge Discharge
Current
Current Current Current
(x10 @50Hz) (x10 @8/20µs) (10/1000µs 100 cycles)
~1.0 A ~60 V
2A 2.5 A
2kA
~0.5 A ~90 V
2A
~0.8 A
~140 V ~90 V
NA* 2A
10 A
~0.5 A
~140 V ~90 V
NA* 2A
1kA
~60 V
2A
<1.0 A
NA*
~0.1 A <0.5 A
~140 V
1A 2A
* 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
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
Voltage (V)
Voltage vs. Time Characteristic
Max dynamic breakover voltage
Hold-over voltage On-State voltage
0 200 400 600 800 1000 1200 Time (ns)
© 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
Pb – Free assembly
- Temperature Min (Ts(min))
Pre Heat - Temperature Max (Ts(max))
- Time (Min to Max) (ts)
Average ramp up rate (LiquidusTemp
(TL) to peak
TS(max) to TL - Ramp-up Rate
Reflow
-Temperature (TL) (Liquidus) - Temperature (tL)
Peak Temperature (TP)
Time within 5°C of actual peak
Temperature (tp)
Ramp-down Rate
Time 25°C to peakTemperature (TP) Do not exceed
150°C 200°C 60 – 180 secs
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
TP
TL TS(max)
Ramp-up
TS(min)
Preheat
tS
25 time to peak temperature (t 25ºC to peak)
tP
Critical Zone TL to TP
tL
Ramp-down
Time
Device Dimensions
Dimensions in Millimeters.
3.2 +/- 0.3
0.5 +/- 0.1 4.5 +/- 0.3
2.7 +/- 0.3
5.2 2.8 4
Recommended Soldering Pad Layout
Device Marking
Type Production Code Year Code
(last digit)
A3A
Production Month Code
Type Code
A SG75 B SG90 C SG150 D SG230 E SG300 F SG300Q G SG350 H SG350Q I SG400 J SG420 K SG420Q L SG450Q M SG500Q N SG600Q O SG200
Month Code
A January B February C March D April E May F June G July H August I September J October K November L December
© 2017 Littelfuse, Inc. Specifications are subject to change without notice.
Revised: 12/12/17
Gas Discharge Tubes
SG Series
Tape and Reel Dimensions (IEC 60286-3, dimension in mm)
Tape Specificat.