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Does a low-profile capacitor itself reduce acoustic noise?
Murata’s available product information does not establish component height as the cause of reduced acoustic noise. It identifies particular low-acoustic-noise products and describes ways to limit vibration or noise, but does not provide a controlled comparison showing that a lower profile alone reduces sound. Treat profile as a mechanical design dimension, not a noise-reduction mechanism, unless a product-specific comparison supports that conclusion.
How Murata’s ZRA and ZRB interposer MLCCs address noise
Murata lists ZRA and ZRB as low-acoustic-noise multilayer ceramic capacitors mounted on interposer boards for consumer electronics and industrial equipment. An MLCC contains alternating ceramic dielectric and electrode layers; Murata’s broader overview describes this construction and a lineup spanning different capacitances, voltages, sizes, and applications (Murata MLCC technology overview).
For ZRA, Murata says that mounting the capacitor on an interposer board suppresses transmission of capacitor vibration and thereby reduces the noise level (Murata ZRA series). This describes a vibration-transmission pathway; it does not quantify the reduction a particular board will achieve. Murata also describes acoustic-noise suppression more generally as an outcome of material and configuration design (Murata ceramic capacitor lineup).
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What the ECAS comparison does—and does not—show
Murata presents ECAS polymer aluminum electrolytic capacitors as an alternative to conventional MLCCs when addressing unpleasant noise and vibration. Its official video description says that measuring sound pressure level (S.P.L.) including background noise shows approximately 40% lower S.P.L. for the ECAS series compared with regular MLCCs (Murata ECAS video description). The page does not state a publication year in the retrieved description.
That is Murata’s stated comparison, not an independent result or a guarantee for a specific circuit. It is not a ZRA/ZRB measurement, nor does it establish that every ECAS part will outperform every MLCC in every board, operating condition, or sound measurement.
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Choosing between the documented approaches
These options are not automatically interchangeable. Start with the circuit’s electrical and mechanical requirements, then check whether the relevant noise-control approach fits the design.
| Option | Documented approach | What the cited evidence establishes |
|---|---|---|
| ZRA/ZRB interposer MLCCs | Interposer board suppresses transmission of capacitor vibration, according to Murata’s ZRA description. | Murata identifies these series as low-acoustic-noise MLCCs. The cited lineup does not give a universal noise-reduction value. |
| ECAS polymer aluminum electrolytic capacitors | Alternative capacitor technology to conventional MLCCs. | Murata’s video description reports approximately 40% lower S.P.L. than regular MLCCs in its stated comparison, including background noise. It is not a ZRA/ZRB result. |
Use the product records to confirm the actual part’s specifications. Murata’s part-number listing includes representative ZRA/ZRB examples with differing capacitance and rated voltage; those examples demonstrate that parts exist, not that a particular part suits a design (Murata MLCC part-number list).
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- Electrical fit: Match capacitance, rated voltage, tolerance, operating conditions, and the circuit function the capacitor must perform.
- Mechanical fit: Check package and footprint, board layout, and available height. A profile constraint may affect integration, but the cited information does not show that profile is what reduces acoustic noise.
- Noise-control fit: Decide whether an interposer-based MLCC or an alternative such as ECAS is compatible with the circuit and assembly. Confirm performance under the design’s actual conditions rather than assuming a lineup description predicts board-level results.
Lineups and specifications can change. Check Murata’s current product record for the exact part number before design-in or purchase.
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