gas plasma voltage dependent switches switching gas discharge tubes 316 www.littelfuse.com lt series the lt series is a 2-terminal bi-directional, voltage triggered switch is designed for ignition circuits used in high pressure hid lighting. 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 ? ceramic chamber for ultimate reliability. ? 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. ? tape and reel to eia 481-1 applications ? for switching stored electrical energy (such as capacitive discharge) at predetermined voltages. ? designed for ignition circuits used in high pressure hid lighting. ordering information lt 800 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 lt xxx sm ltxxx 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 (red print) dimensions in mm rohs
switching gas discharge tubes gas plasma voltage dependent switches 317 www.littelfuse.com 7 switch gas discharge tubes lt series lt device v o.c. dc voltage =1000 51k ? fig 1 . recommended breakover voltage test circuit (discharge current = 10-20ma, sensitivity of peak voltage detect = 10-30ma) p.v.d. 0.22 f lt device v 20k fig 2. recommended life circuit ? 330nf 0.4 h 1000vdc part number device ratings and specifications v bo (1) (v) v s (v) v t @ 5a (v) i drm (2) (a) electrical life: switching cycles (5) 400,000 peak discharge current (5) ? 400 a maximum ratings: max switching frequency ? 100 hz storage temperature t stg ?-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.) definitions: v bo ?breakover voltage v s ?switching 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 i bo (3) (ma) c o (4) (pf) v bo to v t (ns) lt230 195 ?65 184 ?276 15 1.0 50 2.0 25 lt800 680 ?920 640 - 960 15 1.0 50 2.0 25 rohs
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