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Non-Polarized Ceramic Decoupler Capacitor

IP.com Disclosure Number: IPCOM000048181D
Original Publication Date: 1981-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Crawford, TL: AUTHOR [+3]

Abstract

Shown are ceramic capacitor ribbon terminal module packages proposed for replacement of tantalum fuse ribbon terminal capacitors.

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Non-Polarized Ceramic Decoupler Capacitor

Shown are ceramic capacitor ribbon terminal module packages proposed for replacement of tantalum fuse ribbon terminal capacitors.

Heretofore, ceramic capacitors had limited usage as high frequency decouplers in a molded radial leaded package because of its high inductance in the high MHz frequency range. In the design shown, the inductance can be lowered to less than 1 NH, which makes it very attractive for high frequency decoupling.

The ceramic chip capacitor 1 is shown contained within a module case 2, together with its end metallization 3 and lead terminals 4. The distance "A" of the projecting leads can be about 1.27 mm. The vertical distance "B" constitutes the most critical dimension, since the greater the length, the greater the inductance. As a result, the ribbon lead length should be kept as short as possible.

What is significant about this design is the ribbon lead terminals, which reduce the inductance of the capacitor packaged module substantially in application in the 100 MHz range. The reduced inductance of the ribbon terminal design is due to the flat ribbon leads having a larger cross-sectional area that reduces the current density. This combined with the lead geometry contributes to less self inductance throughout the lead.

Also, the designs of Figs.1 and 2 will eliminate polarity problems normally associated with tantalum capacitors. The failure mode of a ceramic capacitor is an immediate open upon failu...