Seiko touts 'thinnest' chip-type double-layer capacitor

Tag: R-407C

Recently, the demand for smaller and thinner portable electronic communication devices, such as mobile and smart phones, has increased significantly. As such, the electronic components used in these products need to be smaller and thinner to facilitate these more compact packages of R-407C.

With that industry demand in mind, Seiko Instruments Inc. will introduce the world's thinnest and smallest chip-type electric double layer capacitor, part number CP3225A, in October.

The electric double-layer capacitor (EDLC) functions as a rechargeable electrical storage device, and is commonly used for mobile phone memory and clock back-up during the primary battery's run out or replacement.

Somewhat different than the coin cell battery that may often be used in these applications, the new device from Seiko contains activated carbon, which has large surface area, in its electrode, while using organic solvent in the electrolyte.

Current EDLC packages are typically "coin" shaped, and don't completely use the board space allocated to them due to the round shape. Also, metal solder tabs are always required for surface mounting, which increases size thickness.

The CP3225A product is "chip" shaped in an industry-standard rectangular package, effectively increasing volumetric efficiency by 50 percent. By integrating tabs into the package itself, the CP3225A also achieves a 20 percent reduction in mounting height at only 0.9mm, said to be the thinnest in the industry.

Ceramic has been chosen for the CP3225A's package incorporating SII's developed inner structure and encapsulating technique. This ceramic packaging offers superior air-tightness and leakage resistance compared to that of a coin-type package.