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SMD and Leaded Ceramic Capacitors for High Temperature Applications
Keywords: High temperature capacitor, BME MLCC, C0G
For high temperature applications at 150C or above, such as in electronics for down-hole drilling, geothermal energy generation, power electronics and automotive under the hood electronics, a robust dielectric material is necessary for capacitors. Common X7R and X8R type ceramic capacitors are designed for applications up to 125C and 150C, respectively. At temperatures above 150C, these types of capacitors typically suffer from degradation of reliability performance and severe reduction in capacitance, especially under DC bias conditions. Recently, a Class-I dielectric material has been developed using Nickel electrodes for high temperature application up to 200-250C. Due to its linear dielectric nature, this material exhibits highly stable capacitance as a function of temperature and voltage. Multi-layer ceramic capacitors (MLCCs) made from this material can be qualified as X9G. This paper will report electrical properties and reliability test data on these Class-I type ceramic capacitors in SMD chip and leaded configurations at 150-200C and above along with a discussion of possible mechanisms behind the robust reliability of this high temperature dielectric.
Abhijit Gurav, Vice President, Ceramic Technology
KEMET Electronics Corporation
Simpsonville, SC

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