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

Posted: 23 Apr 2008 ?? ?Print Version ?Bookmark and Share

Keywords:chip-type electric double layer capacitor?


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.

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.

The CP3225A chip-type device measures 3.2mm x 2.5mm x 0.9mm. With a high capacity of 14mF, the device, when compared with a similar sized tantalum capacitor, contains over 30x more electric capacity.

The device has a max. charge voltage rating of 2.6V. According to the company, organic solvent in electrolyte allows for a wider voltage range, from 0-2.6V. Thus, overcharge/overdischarge prevention circuitry is no longer necessary. Adds Seiko, a 1min charge of the device stores approximately 90 percent of full capacity. Also, with load current of 1100?A, discharge capacity exceeds 90 percent. Charge-discharge cycle is rated at above 50,000.

The device also has a heat-resistant design that allows for Pb-free reflowable SMT board attachment.

Applications include backup for memory, clock function and power management ICs for mobile phones and most other portable electronic devices.

Samples will be available in June, with mass production set to start in October. Sample pricing is yet to be determined.

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