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| Switching Gas Discharge Tubes Gas Plasma Voltage Dependent Switches RoHS VS Series The VS Series is a 2-terminal bi-directional, voltage triggered switch designed for gas fuel ignition systems and similar circuits. 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. Applications * For switching stored electrical energy (such as capacitive 8.0 +0.20 - 0.20 discharge) at predetermined voltages. * Designed for in gas fuel ignition systems and similar circuits. 6.0 - 0.20 60.0 + 4 +0.20 Mechanical Specifications: Weight: Materials: 1.42g (0.049oz.) Electrode Base: Copper alloy Electrode Plating material: Bright Sn Body: Ceramic Littelfuse `LF' marking, voltage and product code Device Marking: 318 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 VS Series VBO(1) (V) 200 -255 350 - 550 400 - 750 VT Device Ratings and Specifications Part Number VS230 VS450 VS600 @ 5A (V) IDRM (2) (A) 1.0 1.0 1.0 IBO (3) (mA) 50 50 50 CO (4) (pF) 2.0 2.0 2.0 VBO to VT (nS) 25 25 25 15 15 15 7 SWITCH GAS DISCHARGE TUBES Electrical Life: Maximum Increase in VBO(1) ............................................................ 25 V Switching Operations (6) .................................................................. 2,000,000 Maximum Ratings: Surge On-State Current (5) ............................................................... 1000A Storage Temperature TSTG ............................................................... -40 - +150C Operating Temperature ............................................................... -40 - +150C Notes: (1) Measured on recommended test circuit (fig 1.) (2) Measured @ 300 Volts DC (3) Current required for transition to on-state (4) Measured @ 1 MHz, zero Volt bias (5) Using 8/20s double exponential pulse (6) Measured on recommended test circuit (fig 2.) Definitions: VBO - Breakover 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 15K O.C. DC voltage =1000 V 0.22F P.V.D. V 230Vac 2.2F LT device 32H VS device Fig 1. Recommended breakover voltage test circuit (Discharge current = 10-20mA; Sensitivity of peak voltage detect = 10-30mA) Fig 2. Recommended Life Test Circuit w w w. l i t t e l f u s e . c o m 319 |
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