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Manufacturers : Electronic components : Capacitors : Varistors
Varistors, and especially metal oxide varistors, have been widely used as devices for providing nonlinear resistance functions. Varistors are non-linear, voltage-dependent resistors whose value of resistance decreases with increasing voltage. Varistors have high resistance and are good resistors when loaded with voltage below the critical voltage. The resistance of the varistor abruptly decreases and the electric current through the varistor will greatly increase when voltages are higher than the critical voltage. Varistors possess the ability to absorb surges, reduce overload voltage to a safe level and prevent electric components from being damaged by surges. Varistors are utilized in low-voltage electronic equipment for absorbing high-voltage pulsative noise while bypass capacitors are utilized for removing low-voltage and high-frequency alternating noise. Zinc oxide varistors are polycrystaline ceramic semiconductor devices based on zinc oxide. They have highly non-linear current/voltage characteristics, similar to back-to-back Zener diodes, but with much greater current and energy handling capabilities. Zinc oxide varistors are and widely applied to home appliances, factory devices, power transmission lines and other many kinds of instruments having electrical circuits, to protect them from damages to power surges by taking advantage of the nonlinearity between current and voltage of a varistor.


Listings on Electronic components : Capacitors : Varistors

  • CeNtRa Science Corp.
    Manufacturer and exporter of power protection equipments, specializing in manufacturing metal oxide varistors, which are nonlinear resistors, consisting main of zinc oxide and several kinds of metal oxide additive used for absorption of transient voltage, suppression of pulse noise and circuit voltage stabilization. Taiwan, China.
    http://www.cnr.com.tw
  • Crownpo Technology Inc.
    Specializes in producing hybrid IC and ceramic substrate chip resistors, resistor network and chip resistor array, rectifiers, protection products, small signal products, zener diodes, semiconductor varistor, radio frequency IC, transistors, analog IC, opto products, and inductors. Taiwan, China.
    http://www.crownpo.com
  • Littelfuse
    Supplies overcurrent products such as fuses and resettable PTCs as well as overvoltage products including polymer electrostatic discharge (ESD) suppressors, gas discharge tubes (GDTs), silicon avalanche diodes (SADs), surface mount multilayer varistors (MLVs), metal oxide varistors (MOVs) and UL recognized protection thyristors. USA.
    http://www.littelfuse.com
  • Maida Development Company
    Manufactured products include a complete line of radial-leaded ceramic zinc-oxide varistors along with a line of surface mount monoblock and multilayer varistors. Common applications include ground fault interrupters, specialty high-voltage power supplies, telecommunication equipment, computer and computer-related products, motor control systems, cable TV systems, and AC smoke detectors, plus many special applications. Maida also manufactures a complete line of high voltage ceramic disc capacitors, complemented by a full selection of safety capacitors. USA.
    http://www.maida.com
  • MDE Semiconductor, Inc.
    Manufactures radial-leaded varistors, tab-leaded varistors, high current transient voltage suppressors, high current transient voltage suppressor (TVS) diodes, silicon avalanche transient voltage suppressor (TVS) diodes, low capacitance transient voltage sSuppressors, two terminal thyristors , and JEDEC devices. USA.
    http://www.mdesemiconductor.com
  • New Chien Wei Electronics Co., Ltd.
    Manufacturer of metallized polyester film capacitor, metallized polypropylene film capacitor, polyester film capacitor, polypropylene film capacitor, AC capacitor, ceramic capacitor, metal oxide varistor, metal film resistor, carbon film resistor, metal oxide film resistor, and thick film chip resistor. Taiwan, China.
    http://www.jt-capacitor.com.tw

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