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Electrical and physical characteristics play a role in high-accuracy detection.

Most multilayer ceramic capacitors (MLCC) have no marking and cannot easily be distinguished from their package, which gives unscrupulous vendors opportunities for fraud. Here, the authors introduce several test methods for MLCC compliance verification, namely 1) the effect of DC bias on capacitance, 2) capacitance temperature characteristics, 3) high-voltage testing of DCW (dielectric withstand voltage) and IR (insulation resistance), 4) cross-section (dielectric layer and terminal comparison for flex types), and 5) electron microscopy (EDS) material analysis to match with known good device chemical composition.

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