Many customers say, I used to design and use of graphics, those nominal 16V KEMET tantalum capacitor Even to buck 8V use, is also not guarantee not to be breakdown! Yes ta MnO2 capacitorsDoes the problem, it is because the cathode capacitance of MnO2 are too rigid and mighty, due to the high hardness of manganese dioxide, in use process due to thermal expansion and contraction caused by the stress of manganese oxide particles can be extruded five oxide thin tantalum two dielectric layer, resulting in medium thinning, so the higher the voltage is easy to cause a short circuit breakdown medium, so the traditional tantalum MnO2 capacitors are to buck 50%.
however Polymer tantalum capacitor No, because the polymer and soft plasticity and strong, even if the encounter stress will not cause great harm to the five oxidation two tantalum layer, so the low voltage products as long as 10% buck, Buck 20% high voltage products such as 16V can be used, that is to say 16V Polymer tantalum capacitor Safe working voltage is 12.8V, is applied to 670 and 9600 12V external power supply filter.
Look at the table, this is KEMET two KEMET tantalum capacitor The comparison of test data. If you use the card for tantalum polymer capacitor at 1000000 (PPM ppm) trial met several times of failure (Note: failure is not damaged, it can continue to work), then you can buy lottery tickets.