3-electrode gas discharge tube (gdt) revision march 6, 2014 1 / 4 @socay electronics co., ltd. 2014 specifications are subject to change without notice. please refer to www.socay.com for current information. un3e7 series socay electronics co., ltd. www.socay.com un3e7-xxxhm un3e7-xxxh 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. they are thus fitted at the input of the power supply system together with varistors and at the connection points to telecommunication lines. they have become equally indispensable for protecting base stations in mobile telephone systems as well as extensive cable television (catv) networks with their repeaters and distribution systems. these protective components are also indispensable in other sectors, in ac power transmission systems, they are often used with current-limiting varistors, in customer premises equipment such as dsl modems, wlan routers, tv sets and cable modems in air-conditioning equipment, the integral black-box concept offers graduated protection by combining arresters with varistors, ptc, diodes and inductor. agency agency file number e341061 materials nickel-plated with tinplated wires u non-radioactive u rohs compliant u low insertion loss u excellent response to fast rising transients u ultra low capacitance u 10ka surge capability tested with 8/20 s pulse as de ? ned by iec 61000-4-5 product marking union xxxh xxx -nominal voltage m -20ka glow to arc transition current ~1 amps glow voltage ~70 volts storage and operational temperature -40 to +90 c un3e7-xxxhm ~2.3g weight un3e7-xxxh ~2.1g climatic category (iec 60068-1) 40/ 90/ 21 u communication equipment u catv equipment u test equipment u data lines u power supplies u telecom slic protection u broadband equipment u adsl equipment, including adsl2+ u xdsl equipment u satellite and catv equipment u consumer electronics features schematic symbol agency approvals product characteristics applications description a e b a = tip b = ring e = ground (center electrode)
3-electrode gas discharge tube (gdt) revision march 6, 2014 2 / 4 @socay electronics co., ltd. 2014 specifications are subject to change without notice. please refer to www.socay.com for current information. un3e7 series socay electronics co., ltd. www.socay.com radial leaded devices (un3e7-xxxhm) without wire devices (un3e7-xxxh) service life dc spark-over voltage maximum impulse spark-over voltage maximum capacitance arc voltage nominal impulse discharge current max impulse discharge current nominal alternating discharge current impulse life part number marking @100v/s @100v/ s @1kv/ s minimum insulation resistance @1mhz @1a @8/20 s 4) 5 times @8/20 s 4) 1 time @50hz 4) 1 sec 10 times @10/1000 s 4) 300 times un3e7-75hm un3e7-75h union 75h 75v 20% 500v 600v 1 g (at 25v) 1.5pf ~15v 20ka 25ka 20a 200a un3e7-90hm un3e7-90h union 90h 90v 20% 500v 600v 1 g (at 50v) 1.5pf ~15v 20ka 25ka 20a 200a un3e7-150hm un3e7-150h union 150h 150v 20% 500v 600v 1 g (at 50v) 1.5pf ~25v 20ka 25ka 20a 200a un3e7-230hm un3e7-230h union 230h 230v 20% 600v 700v 1 g (at 100v) 1.5pf ~25v 20ka 25ka 20a 200a un3e7-250hm un3e7-250h union 250h 250v 20% 600v 700v 1 g (at 100v) 1.5pf ~25v 20ka 25ka 20a 200a un3e7-350hm un3e7-350h union 350h 350v 20% 800v 900v 1 g (at 100v) 1.5pf ~25v 20ka 25ka 20a 200a un3e7-470hm un3e7-470h union 470h 470v 20% 900v 1000v 1 g (at 100v) 1.5pf ~25v 20ka 25ka 20a 200a un3e7-600hm un3e7-600h union 600h 600v 20% 1100v 1200v 1 g (at 100v) 1.5pf ~25v 20ka 25ka 20a 200a un3e7-800hm un3e7-800h union 800h 800v 20% 1200v 1400v 1 g (at 100v) 1.5pf ~25v 20ka 25ka 20a 200a notes: 1). terms in accordance with itu-t k.12 and gb/t 9043-2008 2). at delivery aql 0.65 level , din iso 2859 3). tip or ring electrode to center electrode 4). total current through center electrode, half value through tip respectively ring electrode dimensions ( unit: mm ) electrical characteristics
3-electrode gas discharge tube (gdt) revision march 6, 2014 3 / 4 @socay electronics co., ltd. 2014 specifications are subject to change without notice. please refer to www.socay.com for current information. un3e7 series socay electronics co., ltd. www.socay.com item test condition / description requirement dc spark-over voltage the voltage is measured with a slowly rate of rise dv / dt=100v/s impulse spark-over voltage the maximum impulse spark-over voltage is measured with a rise time of dv / dt=100v// s or 1kv/ s insulation resistance the resistance of gas tube shall be measured each terminal each other terminal , please see above spec. capacitance the capacitance of gas tube shall be measured each terminal to each other terminal. test frequency :1mhz nominal impulse discharge current the maximum current applying a waveform of 8/20 s 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 30% of the nominal dc spark-over voltage. dwell time between pulses is 3 minutes. nominal alternating discharge current rated rms value of ac current at 50hz, 1 sec. 10 times. intervals: 3min. the dc spark-over voltage does not exceed 30% of the nominal dc spark-over voltage. ir > 10 8 ohms. to meet the specified value solder iron temperature: 350 c +/-5 c heating time: 5 seconds max. electrical rating recommended soldering profile w ave soldering soldering profile applied a single process reflow soldering soldering parameters - hand soldering 1.0 0.9 0.5 0.1 0.0 20 sec 30% max t i 8 sec
3-electrode gas discharge tube (gdt) revision march 6, 2014 4 / 4 @socay electronics co., ltd. 2014 specifications are subject to change without notice. please refer to www.socay.com for current information. un3e7 series socay electronics co., ltd. www.socay.com part number description quantity un3e7-xxxhm 100pcs per tray, 10 trays / inner carton 1000 un3e7-xxxh 100pcs per tray, 10 trays / inner carton 1000 tray dimension (unit: mm) u gas discharge tubes (gdt) must not be operated directly in power supply networks. u gas discharge tubes (gdt) may become hot in case of longer periods of current stress (danger of burning). u 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. u damaged gas discharge tubes (gdt) must not be re-used. part numbering un3e7 C xxx h m m, with wire no, without wire 8/20 s level h, 20ka nominal dc spark-over voltage 75 = 75v 350=350v 90 = 90v 470=470v 150 = 150v 600=600v 230 = 230v 800=800v series packaging cautions and warnings
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