The ECAS series reliability is charted on this slide using three key indicators: high temperature life under load, load humidity and the surge voltage test. As demonstrated the polymer aluminum capacitors provide a high level of reliability. Based on intensive knowledge about the design and materials, it is possible to predict its life time under specified conditions using a formula. For example, Murata defines end of life for the ECAS series as a greater than 20% capacitance drop from the initial value. Using the estimated life calculations, the length of time it would take for the conductivity of the polymer of a capacitor, at a specified voltage and temperature continuously, to be reduced to where the capacitor value drops more than 20% of the initial value can be approximated. This is temperature and voltage driven and would apply for all parts with the same voltage rating, independent of capacitor value. While most manganese dioxide tantalum capacitors support a similar life estimation, tantalum failure is not easily predicted as there are no known equations to do so. Not only do engineers typically heavily de-rate tantalum type capacitors by as much as 50% - 80%, but tantalum type capacitors differ in terms of its failure mode.