gas plasma voltage dependent switches switching gas discharge tubes 320 www.littelfuse.com xt series the xt series is a 2-terminal bi-directional, voltage triggered switch designed for xenon hid 'hot re-strike' circuits such as those found in automobiles. switching voltages for the devices are fixed depending on the part number selected. the gas plasma trigger technology offers very fast switching speeds, resulting in significantly better di/dt values when compared to silicon based sidac devices. due to the high switching voltage of the devices, step-up transformer sizes and specifications can be reduced saving cost, size and weight. features ? rohs compliant ? 2 terminal configuration. ? very high switching speed once switching voltage has been reached, resulting in high di/dt to be generated enabling the best performance to be extracted from ignition transformers. ? high lifetime and stability. ? switching performance is virtually unaffected by changes in ambient temperature. ? tape and reel to eia 481-1 applications ? this product is optimised for xenon hid ?ot re-strike? circuits which require a very high number of operations at high current levels. the switching time is typically 10ns for the best possible efficiency . ordering information xt a v bo package type packaging a= axial lead tape and reel sm= surface mount 8 +0.20 - 0.20 6 +0.20 - 0.20 60.0 +4 xt xxx sm. xt xxx a. mechanical specifications: weight (ballast ciruit only): 1.42g (0.049oz.) materials: electrode base: copper alloy electrode plating material: bright sn body: ceramic device marking: littelfuse ?f?marking, voltage and product code dimensions in mm rohs
switching gas discharge tubes gas plasma voltage dependent switches 321 www.littelfuse.com 7 switch gas discharge tubes xt series r1 xt device c2 v recommended fig 1. breakover voltage test circuit v: open circuit dc voltage =500 (1000v for 600 and 800vparts) c1 =220nf r1 =51k ? discharge current =10 mamps ( approx ) l v r1 xt device c2 fig 2. recommended life test circuit v: open circuit dc voltage =500 (1000v for 600 and 800v parts) c1 =680nf r1 =10k ? l =0.5 h discharge current =500amps ( approx ) part number device ratings and specifications v bo (1) (7) (v) max ignition v t @ 5a (v) i drm (2) (a) i bo (2) (ma) c o (4) (pf) v bo to v t (ns) r s (m) xt350 297 ?403 463 15 1.0 5 1.5 25 >1 xt600 510 ?690 750 15 1.0 5 1.5 25 >1 xt800 680 ?920 1000 15 1.0 5 1.5 25 >1 electrical life: switching cycles (5) 150,000 maximum ratings: max switching frequency(6) ? 400 hz storage temperature tstg ?-40 - +150?c operating temperature ?-40 - +150?c notes: (1) measured on recommended test circuit (fig 1.) (2) measured @ 100 volts dc (3) current required for transition to on-state (4) measured @ 1 mhz, zero volt bias (5) measured on recommended test circuit (fig 2.) (6) duty cycle: 1sec on, 10 sec off. (7) will retain these limits during life cycle definitions: v bo ?breakover voltage v t @ 5a ?nominal off-state voltage at 5a i drm ?off-state current i bo ?nominal breakover current c o - max capacitance v bo to v t ?max switching time from v bo to v t
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