Metal oxide varistors and methods therefor

Details Metal oxide varistors and methods therefor Metal oxide varistors and methods therefor

1989-12-08

1991-02-26

Reinhart, Mark J.

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

338 20, 264 61, 296101, H01C 710

Patent

active

049965107

ABSTRACT:
A varistor comprises a primary varistor metal oxide, aluminum in an amount of about 1 to about 30 parts per million (ppm), about 0.1 to about 0.5 mole % bismuth, about 0.1 to about 1.5 mole % antimony, about 0.1 to about 1 mole % chromium, about 0.1 to about 1.0 mole % manganese, about 0.1 to about 2.0 mole % cobalt, and about 0 to about 1.0 mole % boron. Each of these elements is present in the form of its oxide and the varistor has a DC leakage current at 80% of V.sub.1ma/cm.spsb.2 of less than 1.0.times.10.sup.-7 amp/cm.sup.2.

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