gas discharge tubes (gdt) use noble gasses enclosed in ceramic tubes to provide an alternate circuit path for voltage spikes.the ceramic envelope and with nickel connectors allow for high loads and ruilon offers products that function at 20ka,40ka,50ka,60ka,100ka&150ka.the breakdown voltages of the devices have a wide range (up to 20% tolerance).major applications are high frequency telecommunication lines,stations, security systems,hid and high quality surge protection devices (spd). product name 2 r x x x - 4 s stable breakdown voltage 2r : 2 electrodes dc spark-over voltage dimensions 4 : 4.2mm*4.0mm lead type s:smd features 2r-4s series gas discharge tubes 0 . 5 0 . 1 4.0 0.2 4.2 0.2 3 . 5 5 . 0 1 . 3 size:4.2mm*4.0mm dc spark-over voltage: 75~2000v stable breakdown voltage. high insulation resistance. low capacitance (<1pf) high holdover voltage. large absorbing transient current capability. low capacitance micro-gap design cable modem xdsl set-top box satellite and catv equipment power supplier consumer electronics general telecom equipment ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! applications
electriacl characteristics part number dc spark-over voltage maximum impulse breakdown voltage max. impulse discharge current (8/20s) impulse life (10/1000s) normal alternating discharge current dc holdover voltage minimum insulation resistance maximum capacitance (1mhz) 100v/s 100v/ s 1kv/ s 1 times 10 times 300 a 50hz 1sec single 9 cycles <150ms (v) (v) (v) (ka) times (a) (v) (g) (pf) 2r075-4s 7520% 700 800 5 3 300 3 6 52 1 0.5 2r090-4s 9020% 700 800 5 3 300 3 6 52 1 0.5 2r150-4s 15020% 600 800 5 3 300 3 6 80 1 0.5 2r230-4s 23020% 600 700 5 3 300 3 6 150 1 0.5 2r250-4s 25020% 600 700 5 3 300 3 6 150 1 0.5 2r300-4s 30020% 600 700 5 3 300 3 6 150 1 0.5 2r350-4s 35020% 650 800 5 3 300 3 6 150 1 0.5 2r400-4s 40020% 700 800 5 3 300 3 6 150 1 0.5 2r470-4s 47020% 800 900 5 3 300 3 6 150 1 0.5 2r600-4s 60020% 900 1000 5 3 300 3 6 150 1 0.5 2R800-4S 80020% 1300 1400 3 2 100 2 4 150 1 0.5 2r1000-4s 100020% 1500 1600 3 2 100 2 4 150 1 0.5 2r1200-4s 120020% 1700 1800 3 2 100 2 4 150 1 0.5 2r1400-4s 140020% 1700 1800 3 2 100 2 4 150 1 0.5 2r1500-4s 150020% 2000 2100 3 2 100 2 4 150 1 0.5 2r1600-4s 160020% 2000 2100 3 2 100 2 4 150 1 0.5 2r1800-4s 180020% 2500 2600 3 2 100 2 4 150 1 0.5 2r2000-4s 200020% 2700 2600 3 2 100 2 4 150 1 0.5 dc spark-over voltage dc measuring voltage 75-90v 50v 150-400v 100v 470-800v 250v 1000-2000v 500v
pb ? f ree assembl y pr e heat - te mperature min (t s(min) )1 50c - te mperature max (t s(max) )2 00 c - ti me (min to max) (t s )6 0 ? 1 80 secs a verage ramp up rate (liquidus t emp (t l ) to peak 3c/second ma x t s(max) to t l - ra mp-up ra te 5c/second ma x - te mperature (t l ) (liquidus) 21 7c - te mperature (t l )6 0 ? 1 50 seconds p eak t emperature (t p )2 6 0 +0/-5 c ti me within 5c of actual peak te mperature (t p ) 10 ? 30 seconds ra mp-down ra te 6c/second ma x ti me 25c to peak t emperature (t p )8 minutes max. do not exceed 260 c ti me e r u t a r e p m e t t p t l t s(max) t s(min) 25 t p t l t s time to peak temperatur e (t 25oc to peak) ramp-dow n ramp-u p preheat critical zone t l to t p dwell ti me 0 20 40 6 0 80 100 120 140 16 0 180 200 220 240 26 0 280 300 0 10 20 30 40 50 6 0 70 80 90 10 0 11 0 12 0 13 0 14 0 15 0 16 0 17 0 18 0 19 0 20 0 21 0 22 0 23 0 24 0 ti me (seconds) te mperature (c) - measured on bottom side of board cooling ti me preheat t im e w ave pa ramete rl ead- fr ee r ecommendatio n pr eheat : (depends on flux a ctiv ation te mperat ure) (t ypical indust ry r ecommendation) te mperat ure minimum: 10 0 c te mperat ure maximum: 15 0 c p reheat t ime: 60-1 80 seconds so lder p ot t emperature: 280 c maximu m so lder dwell t ime: 2-5 seconds soldering parameters -wave soldering recommended process parameters
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