Comparison with MLCC | Comparison with various capacitors

Acoustic noise

When voltage is applied to an MLCC, the dielectric element expands in the electric field application direction and contracts in the vertical direction, causing the chip mounting board to vibrate and may generate acoustic noise.
By contrast, the dielectric elements used in the ECAS series do not distort even when voltage is applied, so acoustic noise caused by that does not occur.

When voltage is applied Image 1 of When voltage is applied

Std design MLCC

The board vibrates, may generate acoustic noise

ECAS series

Acoustic noise does not occur

Sound pressure level Image of Sound pressure level

MLCC solutions for suppressing acoustic noise is here

You can also view a video showing the main causes of acoustic noise and ways to counteract them. Be sure to watch it to get an idea though images of phenomena that may be difficult to visualize, such as vibration of circuit boards on which chips are mounted.

Causes of acoustic noise: Starts at 1:50 seconds
Description of countermeasures: Starts at 2:17 seconds

Effective capacitance

The effective capacitance of MLCCs that use a barium titanate ferroelectric changes (decreases) when a DC voltage is applied to the capacitor.
By contrast, such capacitance change rarely occurs in the ECAS series.
This enables use without concern about capacitance change due to applied voltage.

Voltage dependence of capacitance

Mechanical strength

MLCCs are composed of ceramic, so cracks that occur during board deflection, etc. may result in open-circuit or short-circuit defects.
By contrast, the main components of the ECAS series are metal and resin, which provide extremely high mechanical strength compared to MLCC.

MLCC

ECAS series Image 2 of Mechanical strength

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Polymer Aluminum Electrolytic CapacitorsComparison with MLCC

Acoustic noise

Effective capacitance

Mechanical strength