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Another overstress failure mode found in film capacitors occurs when peak current limits are exceeded, due to a fuse-like action at the region where the “plates” of the capacitor join to the external leads.  This is particularly common with the metallized film types, due to their very small electrode thickness and the resulting delicacy of their connection to the outside world.  Many film type capacitors will specify a maximum rate of voltage change (dV/dt) that is to be applied across the capacitor.  This is tantamount to specifying a peak current through the device since I(t)=C*dV/dt, though voltages are typically more convenient to measure than currents.

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Polyphenylene Sulphide (PPS) dielectrics can be regarded as a reflow-compatible alternative to polypropylene, for applications where quality of capacitance is more important than qualityquantity.  Relative to polyproplynepolypropylene, PPS capacitors exhibit a higher specific capacitance and dissipation factor over the range of applicable frequencies by a factor or roughly 2 to 3, though stability of capacitance over the temperature range is slightly improved.

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