High-Temperature Capacitors Push Performance To 200°C And Beyond

by by Ron Demcko, KYOCERA AVX, Fountain Inn, S.C. and Slavomir Pala, KYOCERA AVX, Lanškroun, Czech Republic , How2Power Today, Mar 15 2022

Focus:
In electronics applications such as oil logging, jet aircraft and other industrial applications, passive components such as capacitors are subject to extremely high temperatures, often in the range of 180°C to 300°C. For MLCCs and tantalum capacitors, the 125°C limit on operating temperature for military components is insufficient. This article reviews the history of the early efforts to address the need for more-robust capacitors. It then discusses the high-temperature options available today for MLCCs and tantalum capacitors; the material systems, manufacturing processes and terminations which enable these parts; and how the different material systems affect key performance parameters such as capacitance stability and voltage rating. In addition to examining the various dielectric types for MLCCs and tantalum electrolytics, options for achieving higher capacitance values through stacking or modular configurations are noted.

What you’ll learn:

• How to understand what high-temperature options are available for MLCC and tantalum capacitors
• How to understand how capacitance stability and voltage rating of MLCCs and tantalums vary over temperature
• How to understand the history of high-temperature capacitor development

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