surface mount 2-electrode gas discharge tube (gdt) revision october 18, 2013 1 / 4 @ un semiconductor co., ltd. 2013 specifications are subject to change without notice. please refer to www.unsemi.com.tw for current information. un1812 series un semiconductor co., ltd. www.unsemi.com.tw 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. the 1812 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 500a pulse in a miniature package 1812 without destruction. agency agency file number e341061 materials dull tin-plated u non-radioactive u rohs compliant u ultra low capacitance (<1.0 pf) u ul recognized u excellent response to fast rising transients u 2ka surge capability tested with 8/20 s pulse as de ? ned by iec 61000-4-5 u square outline product marking without storage and operational temperature -40 to +90 c weight ~180mg 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 general telecom equipment u esd protection features schematic symbol agency approvals description product characte ristics applications
surface mount 2-electrode gas discharge tube (gdt) revision october 18, 2013 2 / 4 @ un semiconductor co., ltd. 2013 specifications are subject to change without notice. please refer to www.unsemi.com.tw for current information. un1812 series un semiconductor co., ltd. www.unsemi.com.tw dc spark-over voltage maximum impulse spark-over voltage maximum capacitance arc voltage nominal impulse discharge current part number @100v/s @100v/ s @1kv/ s minimum insulation resistance @1mhz @1a @8/20 s 5 times UN1812-90CSMD 90v 20% 600v 700v 1 g (at 50v dc) 1.0pf ~15v 2 ka un1812-150csmd 150v 20% 600v 700v 1 g (at 50v dc) 1.0pf ~15v 2 ka un1812-200csmd 200v 20% 600v 750v 1 g (at 100v dc) 1.0pf ~15v 2 ka un1812-230csmd 230v 20% 600v 750v 1 g (at 100v dc) 1.0pf ~15v 2 ka un1812-300csmd 300v 20% 800v 900v 1 g (at 100v dc) 1.0pf ~15v 2 ka un1812-350csmd 350v 20% 800v 900v 1 g (at 100v dc) 1.0pf ~15v 2 ka un1812-400csmd 400v 20% 900v 1000v 1 g (at 100v dc) 1.0pf ~15v 2 ka un1812-470csmd 470v 20% 900v 1000v 1 g (at 100v dc) 1.0pf ~15v 2 ka un1812-600csmd 600v 20% 1100v 1200v 1 g (at 100v dc) 1.0pf ~15v 2 ka 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 device dimensions ( unit: mm ) electrical characteristics recommended pad outline
surface mount 2-electrode gas discharge tube (gdt) revision october 18, 2013 3 / 4 @ un semiconductor co., ltd. 2013 specifications are subject to change without notice. please refer to www.unsemi.com.tw for current information. un1812 series un semiconductor co., ltd. www.unsemi.com.tw 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. to meet the specified value reflow condition pb - free assembly -temperature min (t s(min) ) 150 c -temperature max (t s(max) ) 200 c pre heat - time (min to max) (t s ) 60 -180 seconds average ramp up rate ( liquidus temp t l ) to peak 3 c/second max t s(max) to tl - ramp-up rate 5 c/second max - temperature (t l ) (liquidus) 217 c reflow - time (min to max) (t s ) 60 -150 seconds peak temperature (t p ) 260 +0/-5 c time within 5 c of actual peak temperature (t p ) 10 - 30 seconds ramp-down rate 6 c/second max time 25 c to peak temperature (t p ) 8 minutes max do not exceed 260 c electrical rating recommended soldering profile ramp-down preheat critical zone t l to t p time to peak temperature (t 25 to peak) t p t l t s(max) t s(min) 25 temperature ramp-up time
surface mount 2-electrode gas discharge tube (gdt) revision october 18, 2013 4 / 4 @ un semiconductor co., ltd. 2013 specifications are subject to change without notice. please refer to www.unsemi.com.tw for current information. un1812 series un semiconductor co., ltd. www.unsemi.com.tw part number description quantity un1812-xxxcsmd 12mm tape & 13 reel 2500 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 un1812 C xxx c smd smd, surface mount 8/20 s level c, 2ka nominal dc spark-over voltage 150 = 150v 200 = 200v 350 = 350v 400 = 400v series tape and reel dimensions unit: mm packaging cautions and warnings
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