Metal oxide varistor with non-diffusable electrodes

Details Metal oxide varistor with non-diffusable electrodes Metal oxide varistor with non-diffusable electrodes

1982-07-06

1985-05-07

Envall, Jr., Roy N.

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

338 20, 264 61, 264 66, H01C 710, C04B 3500

Patent

active

045161054

ABSTRACT:
Disclosed is a metal oxide varistor which comprises; a sintered body containing (a) ZnO as a principal component, and (b), as auxiliary components, Bi, Co and Mn in amounts of 0.05.about.2 mole %, 0.05.about.2 mole % and 0.05.about.2 mole %, when calculated in terms of Bi.sub.2 O.sub.3, Co.sub.2 O.sub.3 and MnO.sub.2, respectively, and at least one selected from Al, In and Ga in amounts of 1.times.10.sup.-4 .about.3.times.10.sup.-2 mole %, when calculated in terms of Al.sub.2 O.sub.3, In.sub.2 O.sub.3 and Ga.sub.2 O.sub.3, respectively; said sintered material having been reheated at a temperature of 650.degree..about.900.degree. C. after sintering; and a non-diffusible electrode provided on said sintered body. The metal oxide varistor has excellent pulse response and volt-ampere non-linearity even with respect to a pulse having a short rise time of less than a microsecond.

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Integrated Circuit Fabrication, McGraw-Hill Book Co., New York, .COPYRGT.1982, David J. Elliot, pp. 18-20.

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