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I've noticed that most component retailers split these types, and am wondering what comparative differences there are between them. I know that "regular" tantalum caps usually use MnO2 as an electrolyte, whereas polymer ones use (generally unspecified) polymers instead.
What are the main performance differences between them? Is there a key factor that should decide which type is used in a specific design scenario?
Conventional MnO2 tantalum capacitors are the ideal choice for applications with requirements for high temperatures (currently up to 175C), high voltage (up to 50V) and established reliability. The technology offers highest CV in a small package. It’s possible to use them up to 80% of rated voltage, but in low impedance circuits further derating needs to be applied - see 7].
Tantalum Polymer Capacitors are the best choice for consumer applications with low ESR requirements such as DC/DC converters in notebooks, PDA, telecom and other applications. The parts can be used up to 80% of rated voltage. Manufacturer’s specifications of lead-free reflow process capability, temperature range ratings, leakage current and appropriate storage/handling in accordance to the MSL level should be verified for specific application needs.
NbO OxiCapTM Capacitors offer the safest, available alternative among the various capacitor technologies with good cost-versus-performance value. The parts can be used up to 80% of rated voltage and are compatible with lead-free reflow requirements. The excellent steady state reliability makes these parts a favorite choice not only for consumer applications but also for high end, automotive, computer and professional designs. Appropriate temperature derating needs to be applied for temperatures over 85°C.
http://www.avx.com/docs/techinfo/New_Tantalum_Technologies.pdf
