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Tantalum capacitors boast high breakdown voltage

Posted: 28 Nov 2013 ?? ?Print Version ?Bookmark and Share

Keywords:KEMET? tantalum capacitor? breakdown voltage?

KEMET Corp. has revealed two major technology breakthroughs that allow the firm to deliver solid tantalum capacitors with excellent reliability and highest breakdown voltages. According to the company, the technology meets the needs of engineers designing for medical, aerospace, defense and other high-reliability applications.

The technology includes manufacturing processes for improved dielectric quality, mechanical robustness and a patented screening technique for simulating breakdown voltage. Combined with industry-leading reliability and breakdown voltage (BDV), these technologies also ensure that KEMET's high-grade tantalum capacitors for high reliability designs feature low and stable DC leakage currents, said the firm.

Known as F-Tech, KEMET's tantalum manufacturing technology features techniques for optimizing chemical purity to eliminate hidden dielectric defects that could continue to grow in the field, leading to capacitor failure. The company's patented Simulated Breakdown Screening (SBDS) is a non-destructive testing technique that simulates capacitor BDV without damaging the capacitor. This screening is performed on 100 percent of product when required. Traditional DC leakage (DCL) tests cannot detect small defects in the dielectric and performing these tests at accelerated conditions can actually induce more defects.

Incorporating multiple process technologies, F-Tech is an improved approach to anode manufacturing based on a fundamental understanding of degradation mechanisms in tantalum capacitors. Some of the processes minimize an anode's carbon and oxygen content as these elements can become contaminants that lead to crystallization of the anodic oxide dielectric. Another process technology enhances reliability by ensuring a stronger mechanical connection between the tantalum lead wire and the anode.

Breakdown voltage is the ultimate test of a capacitor dielectric, with a higher BDV indicating a stronger dielectric that will deliver higher reliability in the field. By evaluating the BDV of each and every capacitor, SBDS testing allows KEMET to provide customers with only the most reliable capacitors from a given lot.

These technologies will allow KEMET customers to specify high-grade tantalum capacitors manufactured with the F-Tech process, use SBDS testing, or, for ultimate peace of mind, select both options.

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