Polymer Aluminum Electrolytic CapacitorsSSD usage examples

Recently, Solid State Drives (SSDs) have been replacing Hard Disk Drives (HDDs) owing to the former's advantages of faster data processing speeds, a higher degree of freedom in shape design, and being smaller and lighter than HDDs. The introduction of SSDs started gradually with notebook PCs. In recent years, the introduction of enterprise-grade SSDs has spread to applications for data centers/servers and other high-end equipment. Demand is growing for applications (video streaming, etc.) that require high-speed processing of large amounts of data.

Enterprise-grade SSDs use DRAM volatile memory as a high-speed cache memory. Therefore, they are equipped with a Power Loss Protection (PLP) protective function that compensates in the event that the power supply is cut off by using power charged in capacitors. PLP is a function that protects data and memory if the power supply is unexpectedly interrupted such as in a power outage. It is also called a backup circuit.

Murata Manufacturing's conductive polymer electrolytic capacitors are high-capacity capacitors with no DC bias. Accordingly, it is possible to reduce the number of parts. Moreover, our conductive polymer electrolytic capacitors are highly reliable and have a long life. Therefore, they can demonstrate stable capacity characteristics through their product lifetime.

You can use SSDs in the circuit as shown in the figure below.
They are equipped with a Power Loss Protection (PLP) protective function that compensates in the event the power supply is cut off by using power charged in capacitors.
DRAM is a volatile memory. Therefore, it requires a constant supply of power. This means that there is a need to back up power with capacitors.

You can use the ECAS series with a stable capacity even over a long period of time.
In the example below, if 100 mJ is required, although this could be achieved with 10 capacitors in the ECAS series, you would need the equivalent of 14 tantalum capacitors. You can estimate the life in advance, so you can use them without needing to increase the number of parts.

Differences may arise in the decrease in capacity over a long period of time due to differences in the capacitor materials.

The ECAS has more stable reliability compared to tantalum capacitors, which contributes to stable set operation.

ECAS series capacitors burn less readily than tantalum capacitors, resulting in extremely low risk of ignition if a short occurs due to accidental failure.

There are cases in which many MLCCs are connected and used in parallel as small capacitors.
The ECAS series has a large capacity compared to MLCC and no DC bias characteristics. Therefore, it is possible to reduce the number of parts and to downsize sets in applications using many MLCCs requiring capacitance.

MLCCs have DC bias and temperature characteristics. Therefore, their effective capacity changes when the DC voltage and ambient temperature changes.
In contrast to this, the ECAS series experiences virtually no changes in capacitance with respect to DC bias or temperature. Accordingly, the series can be used for stable power supply design without considering changes in the capacitance due to the temperature and applied voltage.