By adding the ECAS series to its line of multilayer ceramic capacitor (MLCC) products, Murata has further broadened the range of options available to customers. As electronic devices gain ever-more-sophisticated functionality, stricter voltage control is needed for the power lines of the CPU, etc. Maintaining voltage line stability sometimes requires large capacitance. In the past we would have suggested using multiple MLCCs, but now in many cases we can propose combining ECAS series capacitors with MLCCs in order to reduce both the quantity and cost of components.
The ECAS series delivers low ESR, low impedance, and stable capacitance, making it ideal for applications such as smoothing (eliminating ripple and high transient response) various types of power lines subject to large fluctuations in the current load.
Basically, ECAS series capacitors are almost always used in combination with MLCCs, and the ECAS series capacitors really show their value in applications involving suppression of voltage fluctuations (high-speed back-up). Polymer-type tantalum electrolytic capacitors and polymer-type aluminum electrolytic capacitors (can-type) are widely used to suppress voltage fluctuations, but ECAS series capacitors are even more ideally suited for such applications due to their low ESR and good balance between ESR and capacitance.
If you are designing the power line for a CPU, we recommend the ECAS series.