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LGA capacitor offers very low ESL

Posted: 26 Jun 2006 ?? ?Print Version ?Bookmark and Share

Keywords:AVX? land-grid array? LGA? capacitor?

AVX Corp. has developed a land-grid array (LGA) capacitor using a fine copper termination process to produce advanced decoupling capacitors that offer extremely low equivalent series inductance (ESL).

Available in 0204 to 1206 case sizes, the LGA capacitor provides a thickness of 0.5mm up to 1.5mm in larger case sizes. Board-mounting trials at AVX and other sites have shown that parts are readily reflowed, and the mechanical integrity of the LGA solder joint is equivalent, or superior, to those formed with conventional capacitor styles.

Designated the LGA decoupling capacitor, the design builds on technology used by interdigitated capacitors (IDC) and reverse geometry multi-layer ceramic capacitors (LICC) to provide much lower inductance in an industry standard geometry chip. By offering very low inductance, the technology is suitable for the latest "on the package" and board-level decoupling applications, the company said.

High-speed MPU, GPU and DSP semiconductor device performance can be significantly enhanced by reduced inductance capacitors being positioned very close to the die (on the package), AVX said. To better address this application, the LGA capacitor design uses patented technology and a vertical orientation for the internal electrodes, which allows I/O terminals to be located on the bottom of the capacitor so signals feed directly into the vias.

In comparison, MLCCs, LICCs and IDCs all have horizontally oriented electrodes and terminals located on the sides of the capacitors through which electrical signals enter/exit the devices. But with vertical electrodes and precision FCT termination on the bottom, LGA capacitors have very small current loops and therefore very low ESL, said AVX. In addition, the inductance is lower for larger case sizes in the LGA capacitor because the current loop area is set by the design of the internal electrode rather than by the external dimensions of the component.

Pricing for the LGA decoupling capacitor starts at 12 cents in quantities of 10,000. Delivery is 10 to 12 weeks.

- Gina Roos

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