Abstract
Developments and improvements in the materials, design and manufacturing of tantalum bulk capacitors have resulted in new case sizes, improved ESR, higher operating voltages and temperatures. This work discusses the basic design and manufacture of hermetic tantalum and wet tantalum capacitors and the resulting high temperature performance offered by each technology. Specifically, hermetic sealed tantalum capacitors offer a novel set of design options for the high temperature designer. This technology, exhibits superior stability when exposed to high temperatures, high humidity, and ambient atmosphere. The device is impervious to the typical capacitance drop common to high temperature capacitor operation. Thus they enable potentially significant size reductions, lower component counts, and reliability improvements in extremely high temperature applications, such as downhole oil drilling. Both electrical and physical comparisons are made between the characteristics of bulk stacked ceramic capacitors, hermetic tantalum and wet tantalum devices across an operating range of -55°C to +230°C. Lifespan and recommended de-ratings are presented.
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