Anshul Shrivastava 1, Michael H. Azarian 1, and Michael G. Pecht 1
1 Center for Advanced Life Cycle Engineering, University of Maryland, College Park, MD 20742, USA
Polymer aluminum (PA) electrolytic capacitors have
solid conductive polymers as electrolyte. Reliability of polymer
capacitors at elevated temperature humidity is not well understood.
Elevated temperature–humidity testing was performed
on PEDOT PA electrolytic capacitors by two manufacturers,
Nichicon and Nippon Chemi-Con. Both the companies are among
the top suppliers of aluminum electrolytic capacitors worldwide.
Two different dominant failure modes of increase in equivalent
series resistance and increase in leakage current (LC) were
found in the PA capacitors from the two different capacitor
manufacturers. The capacitance value of the polymer capacitors
remained stable during the test. In the subsequent analysis,
a new failure mechanism that has not been previously reported
in the literature was found that leads to the high LC failure
of PA electrolytic capacitors. The criteria for evaluation for this
new failure mechanism should be included during the part and
manufacturer selection process.
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