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