Polymer Aluminum Electrolytic CapacitorsFeatures of each series

The ECAS Series

Aluminum electrolytic capacitors can be broadly divided into three types, based on the cathode material and the structure. Murata’s aluminum capacitors are all-solid multilayer polymer aluminum capacitors (the ECAS series)(Fig. 1).
Other varieties of aluminum capacitors include can-type wrapped aluminum capacitors that use either an electrolyte or a polymer as the cathode. What sets ECAS series capacitors apart are the high conductivity of the conductive polymer used as the cathode and the multilayer (laminated) structure of the aluminum elements. These make possible the lowest ESR obtainable among electrolytic capacitors.
ECAS series capacitors also achieve large capacitances, and the capacitance remains stable when DC voltage is applied due to the lack of DC bias. Thus, the major features of the ECAS series are low ESR, high capacitance, and stable capacitance.

Figure 1. Example of Structure of ECAS Series Capacitor
Figure 2. ECAS Series Capacitor lineup

The ECNS Series

Multilayer conductive polymer aluminum electrolytic capacitors do not have DC bias characteristics, and feature low ESR、high capacitance, and stable capacitance. In terms of size, however, adoption is becoming difficult in recent compact electrical and electronic devices.
A major feature of the ECNS series of multilayer conductive polymer aluminum electrolytic capacitors is the realization of the small size of 3.5 × 2.8 mm.
This enables use by customers who have used MLCC and Ta capacitors thus far, but have the following problems:

  • Problems with DC bias countermeasures and acoustic noise reduction in AV and other equipment
  • Trouble with ripple noise reduction for power supply circuits and capacitor short-circuit failure