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| Switching Gas Discharge Tubes Gas Plasma Voltage Dependent Switches RoHS 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. LT xxx SM 8 +0.20 - 0.20 6 +0.20 - 0.20 60.0 +4 LTxxx A Dimensions in mm ORDERING INFORMATION LT 800 Mechanical Specifications: Weight (ballast ciruit only): 1.42g (0.049oz.) Materials: Electrode Base: Copper alloy Device Marking: Electrode Plating material: Bright Sn Body: Ceramic Littelfuse `LF' marking, voltage and product code (red print) VBO Package Type Packaging A= Axial lead, tape and Reel SM= Surface Mount 316 w w w. l i t t e l f u s e . c o m Switching Gas Discharge Tubes Gas Plasma Voltage Dependent Switches RoHS LT Series VBO(1) (V) 195 -265 680 - 920 Device Ratings and Specifications Part Number LT230 LT800 VS (V) 184 - 276 640 - 960 VT @ 5A (V) 15 15 IDRM (2) (A) 1.0 1.0 IBO (3) (mA) 50 50 CO (4) (pF) 2.0 2.0 VBO to VT (nS) 25 25 7 SWITCH GAS DISCHARGE TUBES 0.4H LT device 317 Electrical Life: Switching Cycles (5) .................................................................. 400,000 Peak Discharge Current (5) ................................................................ 400 A Maximum Ratings: Max Switching Frequency ................................................................ 100 Hz Storage Temperature TSTG ............................................................... -40 - +150C Operating Temperature ............................................................... -40 - +150C 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: VBO - Breakover Voltage VS - Switching Voltage VT @ 5A - Nominal Off-state Voltage at 5A IDRM - Off-state Current IBO - Nominal Breakover Current Co - Max Capacitance VBO to VT - Max switching time from VBO to VT 51K 20K O.C. DC voltage =1000 V 0.22F P.V.D. V 1000Vdc 330nF LT device Fig 1. Recommended breakover voltage test circuit (Discharge current = 10-20mA, sensitivity of Peak Voltage Detect = 10-30mA) Fig 2. Recommended Life Circuit w w w. l i t t e l f u s e . c o m |
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