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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 150C 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 125C and 150C, respectively. At temperatures above 150C, 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 200-250C. 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 150-200C 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