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VOLUME -23 NUMBER 7
Publication Date: 07/1/2008
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Electronic Mfg. Services
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Special Feature: Assembly and Packaging
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July 2008 Issue
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TDK Develops First Adjustable MLCCs
Mount Prospect, IL — TDK Corporation has developed what it calls the industry's first multilayer ceramic chip capacitor with a new internal structure that allows Equivalent Series Resistance (ESR) values to be set to any value within a specified range, stabilizes ESR values, and can control circuit impedance (alternating current resistance).
Due to smaller and increasingly advanced functions of electronic devices such as PCs and mobile information terminals, manufacturers are making strong demands for reduced mounting areas and miniaturization of components. As a result, power supply circuits on boards with ever higher mounting densities must combine multiple capacitors of different types. As a result, impedances must be adjusted over broad frequency ranges. The effects of the minute electrical resistance elements present in the capacitors themselves can cause interference among multiple capacitors depending on the frequency, which can lower noise suppression effects. Generally, it is necessary to use even more components to control these effects.The new capacitor has a new internal structure that allows ESR values to be set while maintaining the same capacitance as earlier products. Because the ESR values of capacitors located in the vicinity of the CPU can be set, there are smaller changes in impedance between the power supply and the CPU over a broad range of frequencies as well as voltage variation limiting effects. Limiting the variation in voltage stabilizes the current signal and eliminates effects on other circuits.
The capacitor is available in 0603 and 0805 configurations. They are suitable for use in applications that require high power supply quality such as communications base stations and high-end PCs. Although the sizes are the same as earlier products of the same type, resistance has been improved to 1200mΩ for the 0603 product and 500mΩ for the 0805 product and the ESR values can be set to any value within a specified range. By adding resistance components, the variation in impedance frequency is lower than earlier products, which will contribute to reducing the number of components needed compared to earlier products. The mounting method is the same as that for two-terminal products, making switching from existing components easy.
Contact: TDK Corp. of America, 1221 Business Center Drive, Mount Prospect, IL 60056
847-803-6100 fax: 847-803-6296 Web:
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