Degradation of zinc oxide varistors volume 5 ken takahashi, t. Both bi 2o 3rich and zn 7sb 2o 12 spinel phases are also usually present at the grain boundaries of the zno, but the presence of a bi 3zn 2sb3o14 phase is possible as well. Zinc oxide varistor 50 series, tvr10471 datasheet, tvr10471 circuit, tvr10471 data sheet. The littelfuse varistor is composed primarily of zinc oxide with small additions of bismuth, cobalt, manganese and other metal oxides. Zinc oxide varistors are strongly nonlinear resistors that have been used to regulate transient voltage surges of unwanted magnitude for high voltage and powerrelated applications, such as surge. The structure of the body consists of a matrix of conductive zinc oxide grains separated by grain boundaries which provide pn junction semiconductor characteristics.
The mixture consists 90 % of zinc oxide grains and the other 10 % is. File number e3168 general information the mov14dxxxk series of 14 mm radial leaded varistor devices protects against overvoltage transients such as lightning, power contact and power induction. Within the useful varistor voltage range, the voltagecurrent. Dc leakage current maximum current with rated dc voltage applied. The commercially available varistors are fabricated by sintering the zinc oxide powder with bismuth oxide and a number of other additives, the exact compositions being proprietary information. Ingredients zinc oxide varistors consist mainly of zinc oxide about 90 % by weight. For higher frequencies, such as radio communication equipment, a gas discharge tube gdt may be utilized. From microstructure to macrocharacteristics, first edition. Metal oxide varistors high energy disc varistor series metal oxide disc varistors features the disc varistor series of transient surge suppressors are industrial provided in disc form for unique. This type contains a ceramic mass of zinc oxide grains, in a matrix of other metal oxides, such as small amounts of. The symmetrical, sharp breakdown characteristics shown in figure 1 enable the varistorvaristor impedance changes many orders of.
These varistors are composed of zinc oxide and some other metal oxides, which provide the desired characteristics for these varistors. Var series zinc oxide varistor va r d k packing type. Znozno grain boundary, rich of bismuth, which is a highly resistive phase, is the main cause of. Time lag between application of surge and varistors turnon conduction state. This product has tvr series zinc oxide varistor functions. Plastic encapsulated type for surge protection size. Metal oxide varistor 7mm disc, jvr07nk65p pdf download rfe international. Circuit protection from transient voltage by varistor. These properties then form the basis for defining the application parameters that are directly related to the nonlinear current. This paper gives an overview of the failure modes of the zno varistors and investigates the characteristics of the varistor when subjected to. Zinc oxide varistor selection only reference varistor voltage varistor voltage should be more than the operating voltage in over protective circuit, the formula is shown as the following. The most common modern type of varistor is the metaloxide varistor mov. Siov 1 varistors have been proven to be excellent protective devices because of their application flexibility and high reliability.
Varistor symbol and applications metal oxide varistor. Zinc oxide varistor 1 specification tvr series surge protection features recommended applications approvals 1. Panasonics mov are available in various disc dimensions 5mm to 20mm diameter, varistor voltages and ul certificated. Jvr 20nk metal oxide varistor components datasheet pdf data sheet free from datasheet data sheet search for integrated circuits ic. Cnr07d471k varistors datasheet pdf oxide varistors. Specifications are subject to change without notice. Maida development company 201 south mallory street hampton, virginia 23663. Varistor testing introduction as with any device, metaloxide varistors possess a number ofway to assure correlation of measured values between maker and user. Fenghua zinc oxide varistor fenghua hk electronics ltd. Jvr10nk datasheet, jvr10nk pdf, jvr10nk pinout, jvr10nk equivalent, jvr10nk replacement metal oxide varistor rfe, schematic, circuit, manual jvr10nk datasheet pdf metal oxide varistor.
Modeling of electrical transport in zinc oxide varistors article pdf available in advances in radio science 12. Measuring the energy handling capability of metal oxide. Zinc oxide varistors ve 07091724 vf 0507101420 max. Article pdf available in american ceramic society bulletin 654. Mechanical properties and microstructure of zinc oxide. Available formats pdf please select a format to send. V1maa vb c v1maa vb c apower voltage ripple coefficient usually take 1. Tvr10471 datasheetpdf list of unclassifed manufacturers. Are nonlinear resistors utilize a semiconductor electronic ceramic element mainly composed of zinc oxide and its resistors change as. Zinc oxide is an inorganic compound with the formula zn o. Zinc oxide znobased pastes with tailored rheological properties have been developed for directwrite fabrication of thickfilm varistor elements in highly integrated, multifunctional electroceramic devices.
Model for zinc oxide varistor journal of materials. Panasonics mov are also know as znr, which stands for zincoxide nonlinear. Etc1, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors. It can be found in rubbers, plastics, ceramics, glass, cement, lubricants, paints, ointments, adhesives, sealants, pigments.
Application of zinc oxide varistors gupta 1990 journal of the. A wide variety of zinc oxide varistor options are available to you, there are 399 suppliers who sells zinc oxide varistor on, mainly located in asia. Rga series zinc oxide varistors are nonlinear resistors, consisting mainly of zinc oxide and several kinds of met al oxide additives. Zinc oxide varistor zinc oxide varistor are nonlinear resistors utilizing semiconductor electronic ceramic element mainly composed of zinc oxide and its nonlinear resistance change as a function of the applied voltage. Pdf modeling of electrical transport in zinc oxide varistors. Zinc oxide varistor are nonlinear resistors utilize a semiconductor electronic ceramic element mainly composed of zinc oxide and its resistors change as a function of the applied voltage. It s called varistor or transient surge absorbers 18v1. Zinc oxide znobased pastes with tailored rheological prop erties have been developed for directwrite fabrication of thickfilm varistor elements in highly. Zno is a white powder that is insoluble in water, and it is widely used as an additive in numerous materials and products including rubbers. Ohwada skip to main content accessibility help we use cookies to distinguish you from. In this chapter the status of zno varistors is assessed. Metal oxide znobased varistor ceramics 331 conductors.
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