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Ceramic Capacitors and Stacks for High Temperature Applications
Keywords: High Temperature, Ceramic Capacitor, C0G
There is a growing need for ceramic capacitors for applications at temperatures of 150°C or above, such as electronics for down-hole drilling, geothermal energy generation and power electronics. In traditional X8R ceramic capacitors (EIA specification, TCC or (deltaC)/C within ±15% between -55°C and +150°C compared that at 25°C), the dielectric material is designed for applications up to 150°C. However, at temperatures above 150°C, the X8R capacitors typically suffer from degradation of reliability performance and severe reduction in capacitance, especially under DC bias conditions. Recently, a Class-I C0G dielectric has been developed using Nickel electrodes for high temperature application up to 200°C and beyond. Due to its linear dielectric nature, this material exhibits highly stable capacitance as a function of temperature and voltage. Multi-layer ceramic capacitors (MLCC) made from this material can be qualified as X9G with robust reliability. This paper will report electrical properties and reliability test data on these Class-I C0G ceramic capacitors at high temperatures at 150-200°C and above. In addition, reliability and other test data on ceramic stacks using this dielectric will be reported along with a discussion of possible mechanisms behind the robust reliability of this high temperature dielectric.
Abhijit Gurav, Senior Director, Ceramic Innovation Center
KEMET Electronics Corporation
Simpsonville, SC

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