Porcelain composition for varistor and varistor

Details Porcelain composition for varistor and varistor Porcelain composition for varistor and varistor

2006-07-11

2006-07-11

Hoang, Tu (Department: 2832)

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

C338S223000

Reexamination Certificate

active

07075404

ABSTRACT:
A varistor is provided which can be driven at a low voltage, has a small leak current, and can realize a high ESD resistance and a high surge resistance. The varistor is formed using a ceramic composition for a varistor which contains zinc oxide as a primary component and sub-components including praseodymium at a content of 0.05 to 3.0 atomic percent of the total, cobalt at a content of 0.5 to 10 atom percent of the total, at least one of potassium, sodium, and lithium at a total content of 0.005 to 0.5 atom percent of the total, at least one of aluminum, gallium, and indium at a total content of 2×10−5to 0.5 atom percent of the total, and zirconium at a content of 0.005 to 5.0 atom percent of the total.

REFERENCES:
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patent: 5854586 (1998-12-01), McMillan et al.
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English translation to JP63-16601 to Yamagichi (Jan. 1988).

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