Varistors Introduction - Vishay

Vishay BCCOMPONENTS. Resistive Products Technical Note Varistors Introduction GENERAL FEATURES. Varistors provide reliable and economical protection against Wide voltage range selection - from 14 VRMS to 680 VRMS. high voltage transients and surges which may be produced, This allows easy selection of the correct component for for example, by lightning, switching or electrical noise on AC the specific application. or DC power lines. They have the advantage over transient High energy absorption capability with respect to size of suppressor diodes in as much as they can absorb much component. higher transient energies and can suppress positive and Response time of less than 20 ns, clamping the transient negative transients. the instant it occurs. When a transient occurs, the varistor resistance changes Low stand-by power - virtually no current is used in the from a very high stand-by value to a very low conducting stand-by condition. value. The transient is thus absorbed and clamped to a safe Low capacitance values, making the Varistors suitable for level, protecting sensitive circuit components.

Varistors Introduction TECHNICAL NOTE Technical Note www.vishay.com Vishay BCcomponents Revision: 04-Sep-13 2 Document Number: 29079 For technical questions, contact: nlr@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE.

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