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Advanced Ceramic Capacitor Solutions for High Temperature Applications
Keywords: High temperature capacitor, Ceramic Capacitor, BME MLCC C0G
For high temperature applications at 150C or above, such as those in electronics for down-hole drilling, geothermal energy generation and power electronics, a robust dielectric material is necessary for capacitors. Ceramic capacitors using X7R and X8R type dielectrics are designed for applications up to 125C and 150C, respectively. At temperatures above 150C, these X7R/X8R types of ceramic capacitors typically suffer from degradation of reliability performance and severe reduction in capacitance, especially when bias is applied. 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. 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, and discuss possible mechanisms behind the robust reliability of this high temperature dielectric.
Abhijit Gurav, Vice President Ceramic Technology
KEMET Electronics Corporation
Simpsonville, South Carolina
USA


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