As shown in the diagram on the previous slide, the input filter stage has the following requirements: good AC voltage performance, which means stability of capacitance over time; capability of withstanding over-voltages and transients coming from the mains; capability to withstand the high voltage testing required by international safety standards, such as UL, IEC, and others; the ability to withstand high current pulses; self-extinguishing  materials used in components for flammability safety requirements; in case of a very high over-voltage or current and possible failure, capacitors shall have open circuit failure mode, without burning; and components with approvals by reference standards from IEC, UL, CSA. To satisfy these requirements, EPCOS offers the B3292x series that is rated at 305 VAC at 105ºC, with a capacitance range from 0.010µF up to 45µF.