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SG350Q
GAS DISCHARGE TUBE, 350V, SMD
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- Manufacturer: LITTELFUSE
- Product type: Gas Discharge Tubes - GDT
- Product Range:SG Series; DC Breakover Voltage:350V; GDT Case Style:SMD; Impulse Discharge Current:1kA; Impulse Sparkover Voltage:700V 88T2461
- Product Range: SG Series
- GDT Case Style: SMD
- DC Breakover Voltage: 350V
- Impulse Discharge Current: 1kA
- Impulse Sparkover Voltage: 700V
| Delivery and price | |
|---|---|
| Units per pack | 2000 |
| Price | 0.585 € |
| Current stock | 10+ |
| Lead time | 30 days |
Datasheet
**Gas Discharge Tubes** SG Series ~~|_|~~ ~~**Ro**~~ **HS** ~~@) SAS~~ ## SG Series ## ~~**Description** Lo~~ 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** [Po~~ **==> picture [244 x 240] intentionally omitted <==** **----- Start of picture text -----**<br> Agency Approvals<br>Lo<br>AGENCY AGENCY FILE NUMBER<br>E128662<br>—<br>2 Electrode GDT Graphical Symbol<br>Lo<br>Additional Information<br>Ee,<br>=<br>Datasheet Resources Samples<br>**----- End of picture text -----**<br> - RoHS compliant and • Ultra small devices Lead-free offered in a variety of - • GHz working frequency mounting lead forms - Excellent stability on • Non-Radioactive multiple pulse duty cycle • Low capacitance (<1pF) - Excellent response to • Voltage Ranges 75V to fast rising transients. 600V - Ultra Low Insertion Loss • UL recognized - 1-2KA surge capability • Conforms to ITU-T K12, tested with 8/20μS IEC 1000-4-5 pulse as defined by IEC • Square Outline - 61000-4-5 ## ~~**Applications** ee~~ - Communication • Broadband equipment equipment • ADSL equipment, - ADSL equipment, including ADSL2+ - CATV equipment - XDSL equipment - Test equipment - Satellite and CATV equipment - Data lines - Power supplies - General telecom equipment - Telecom SLIC protection © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 11/06/15 **Gas Discharge Tubes** SG Series **==> picture [94 x 32] intentionally omitted <==** ## ~~**Electrical Characteristics**~~ **==> picture [514 x 473] intentionally omitted <==** **----- Start of picture text -----**<br> Device Specifications (at 25°C) Life Ratings<br>DC Breakdown Impulse Impulse Insulation Capaci- Arc Glow Glow Nominal Nominal Nominal<br>in Volts Breakdown Breakdown Resistance tance Voltage to Arc Voltage AC Impulse Impulse<br>(@100V/s) in Volts In Volts (@1MHz) (@1A) Transition Discharge Discharge Discharge<br>Part (@100V/µs) (@1 Kv/µsec) Current Current Current Current<br>Number MIN TYP MAX MAX MIN MAX (x10 @50Hz) (x10 @8/20µs) 100 cycles)(10/1000µs<br>SG75 52 75 98 500 650<br>>1GΩ<br>SG90 63 90 117 500 600 2 A 2kA<br>(at 50VDC)<br>SG150 105 150 195 500 600<br>~10 V ~1.0 A ~60 V<br>>1GΩ<br>SG200 140 200 260 550 700 <1 pf 2.5 A<br>(at 100VDC)<br>SG230 172 230 288 650 800<br>2 A<br>SG300 225 300 375 700 850 ~12 V ~0.5 A ~90 V<br>SG300Q 210 300 390 580 650 ~20 V ~0.8 A ~140 V NA*<br>10 A<br>SG350 263 350 437 750 900 >1GΩ ~90 V 2 A<br>SG350Q 263 350 437 600 700 (at 50VDC) <0.8 pf ~12 V ~0.5 A ~140 V NA*<br>1kA<br>SG400 300 400 500 800 950 ~90 V 2 A<br>SG420 315 420 525 800 1000 ~10 V ~60 V 2 A<br>SG420Q 315 420 525 650 750 <1 pf ~20 V <1.0 A NA*<br>SG450Q 370 450 500 680 750 ~20 V 1 A<br>>1GΩ ~140 V<br>SG500Q 400 500 600 950 1050 (at 100VDC) <0.5 pf ~16 V ~0.1 A 2 A<br>SG600Q 450 600 750 1100 1200 <1 pf ~20 V <0.5 A<br>* Specification is not applicable for quick response (SGxxx Q ) version of product<br>Product Characteristics Voltage vs. Time Characteristic<br>Device Tin Plated 17.5±12.5 Microns<br>Materials Max dynamic breakover<br>Construction Ceramic Insulator. voltage<br>Storage and<br>Operational -40 to +90 °C<br>Temperature<br>Typical Insertion Loss<br>Hold-over voltage<br> @ 1.0 GHz = 0.01 dB<br>On-State voltage<br> @ 1.4GHz = 0.1 dB<br> @ 1.8 GHz = 0.53 dB 0 200 400 600 800 1000 1200<br> @ 2.1 GHz = 0.81 dB Time (ns)<br>(V)<br>Voltage<br>**----- End of picture text -----**<br> @ 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 © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 11/06/15 **Gas Discharge Tubes** SG Series **==> picture [93 x 32] intentionally omitted <==** ## ~~**Soldering Parameters - Refow Soldering (Surface Mount Devices)**~~ |Refow Condition<br>Pre Heat<br>- Temperature Min (Ts(min))<br>- Temperature Max (Ts(max))<br>- Time (Min to Max) (ts)<br>Average ramp up rate (Liquidus Temp<br>(TL) to peak|Refow Condition<br>Pre Heat<br>- Temperature Min (Ts(min))<br>- Temperature Max (Ts(max))<br>- Time (Min to Max) (ts)<br>Average ramp up rate (Liquidus Temp<br>(TL) to peak|Pb – Free assembly<br>150°C<br>200°C<br>60 – 180 secs<br>3°C/second max| |---|---|---| |TS(max)to TL|- Ramp-up Rate|5°C/second max| |Refow|- Temperature (TL) (Liquidus)<br>- Temperature (tL)|217°C<br>60 – 150 seconds| |Peak Temperature (TP)||260+0/-5°C| |Time within 5°C of actual peak<br>Temperature (tp)||10 – 30 seconds| |Ramp-down Rate||6°C/second max| |Time 25°C|to peak Temperature (TP)|8 minutes Max.| |Do not exceed||260°C| **==> picture [243 x 151] intentionally omitted <==** **----- Start of picture text -----**<br> t P<br>T P<br>Critical Zone<br>Ramp-up TL to TP<br>T S(max) T L t L<br>Ramp-down<br>Preheat<br>T S(min)<br>t S<br>25<br>time to peak temperature Time<br>(t 25ºC to peak)<br>Temperature<br>**----- End of picture text -----**<br> **==> picture [262 x 19] intentionally omitted <==** **----- Start of picture text -----**<br> Device Dimensions<br>**----- End of picture text -----**<br> **==> picture [244 x 256] intentionally omitted <==** **----- Start of picture text -----**<br> Dimensions in Millimeters.<br>3.2 +/- 0.3<br>0.5 +/- 0.1<br>2.7 +/- 0.3<br>4.5 +/- 0.3<br>5.2<br>2.8 4<br>Recommended Soldering Pad Layout<br>**----- End of picture text -----**<br> ## ~~**Device Marking**~~ |||Type|Production|Production|Production||| |---|---|---|---|---|---|---|---| |||Code|Year Code||||| ||||(last digit)||||| |||A3A|||||| ||||||||| ||||Production||||| ||||Month Code||||| |||**Type Code**||**Month Code**|||| |||A<br>SG75||A||January|| |||B<br>SG90||B||February|| |||C<br>SG150||C||March|| |||D<br>SG230||D||April|| |||E<br>SG300||E||May|| |||F<br>SG300Q||F||June|| |||G<br>SG350||G||July|| |||H<br>SG350Q<br>I<br>SG400||H<br>I||August<br>September|| |||J<br>SG420||J||October|| |||K<br>SG420Q||K||November|| |||L<br>SG450Q||L||December|| |||M<br>SG500Q|||||| |||N<br>SG600Q|||||| |||O<br>SG200|||||| ||||||||| © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 11/06/15 **Gas Discharge Tubes** SG Series **==> picture [94 x 32] intentionally omitted <==** **==> picture [261 x 543] intentionally omitted <==** **----- Start of picture text -----**<br> Tape and Reel Dimensions (IEC 60286-3, dimension in mm)<br>Tape Specifications<br>IEC 60286-3<br>section<br>Dimensions in mm B-B<br>section<br>A-A<br>0.4 ±0.05 2 ±0.1 4 ±0.10 Ø 1.55 ±0.05 Ø 1.6 ±0.1<br>A<br>B B<br>3 ±0.1 A 3.65±0.1 8 ±0.1<br>R0.5 typical<br>SMD-Tape has to withstand<br>a minimum Force of<br>F > 20 N / pocket<br> 2 Kg / pocket<br>minimum vertical load<br>(minimum checking<br>quantity:10 pockets)<br>Reel Specifications<br>IEC 60286-3<br>Dimensions in mm<br>1.5 min.<br>12.8 min.<br>R0.75<br>18.4 max.<br>12.4 +2/-0<br>11.9 min.<br>5°<br>5°<br>±0.1<br>1.75<br>±0.1<br> ±0.1 +0.3 0 5.5<br>12<br>4.9<br>20.2 min. 100 min.<br>Ø Ø330 max.<br>**----- End of picture text -----**<br> ## ~~**Part Numbering System and Ordering Information**~~ **==> picture [136 x 206] intentionally omitted <==** **----- Start of picture text -----**<br> SG xxx Q<br>Series<br>Square GDT<br>Breakdown Voltage<br>75 = 75V<br>90 = 90V<br>150 = 150V<br>200 = 200V<br>230 = 230V<br>300 = 300V<br>350 = 350V<br>400 = 400V<br>420 = 420V<br>450 = 450V (Not available without “Q” suffix)<br>500 = 500V (Not available without “Q” suffix)<br>600 = 600V (Not available without “Q” suffix)<br>Device Option Code<br>(Blank) = Standard device<br> Q = Quick Response Version<br> (300V, 350V, 420V, 450V,<br> 500V, 600V only)<br>**----- End of picture text -----**<br> **==> picture [262 x 75] intentionally omitted <==** **----- Start of picture text -----**<br> Packaging<br>Quantity and Packaging<br>Part Number and Device Type<br>Description<br>SGxxx Surface mount 2000pcs/reel in tape and reel<br>**----- End of picture text -----**<br> © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 11/06/15
Updated at April 23, 2026
Founded in 1927 and headquartered in Chicago, Illinois, Littelfuse is a premier global manufacturer of circuit protection, power control, and sensing technologies. Widely recognized for pioneering the first small, fast-acting protective fuse, the company has grown into an industry leader whose highly reliable components are essential to modern industrial, transportation, and consumer electronics applications worldwide. At the core of the Littelfuse portfolio is an expansive and industry-leading range of circuit protection solutions. This encompasses a massive selection of traditional fuses, fuse holders, and resettable PTC thermistor fuses designed to safely interrupt overcurrent conditions. To defend against electrical overstress, Littelfuse also provides advanced transient voltage suppression (TVS) technologies, including thousands of specialized TVS diodes, TVS varistors, and gas discharge tubes (GDTs) that ensure robust defense against voltage spikes and environmental hazards. Beyond its foundational protection components, Littelfuse manufactures a diverse array of discrete semiconductors, sensors, and switching devices. Engineers rely on their high-performance thyristors, including TRIACs and SCRs, alongside power-efficient Schottky diodes and MOSFETs for demanding power control applications. Complemented by precision proximity sensors and highly reliable reed and solid-state relays, Littelfuse delivers the critical building blocks required for secure, efficient, and complete system design.
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