05085C104KAJ2A
05085C104KAJ2A Datasheet
Multiple terminations of a capacitor will also help in reducing the parasitic inductance of the device. The IDC is such a device. By terminating one capacitor with 8 connections the ESL can be reduced even further. The measured inductance of the 0612 IDC is 60 pH, while the 0508 comes in around 50 pH. These FR4 mountable devices allow for even higher clock speeds in a digital decoupling scheme. Design and product offerings are shown on pages 48 and
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05085C104KAJ2A |
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| Low Inductance Capacitors Introduction As switching speeds increase and pulse rise times decrease the need to reduce inductance becomes a serious limitation for improved system performance. Even the decoupling capacitors, that act as a local energy source, can generate unacceptable voltage spikes V = L di/dt . Thus, in high speed circuits, where di/dt can be quite large, the size of the voltage spike can only be reduced by reducing L. Figure 1 displays the evolution of ceramic capacitor toward lower inductance designs over the last few years. AVX has been at the forefront in the design and manufacture of these newer more effective capacitors. INTERDIGITATED CAPACITORS Multiple terminations of a capacitor will also help in reducing the parasitic inductance of the device. The IDC is such a device. By terminating one capacitor with 8 connections the ESL can be reduced even further. The measured inductance of the 0612 IDC is 60 pH, while the 0508 comes in around 50 pH. These FR4 mountable devices allow for even higher clock speeds in a digital decoupling scheme. Design and product offerings are shown on pages 48 and Charges entering - plate Charges leaving + plate Charges entering - plate Charges leaving + plate 2000 SpinGuard 2000 pH 1500 1000 1206 MLC 1200 pH 0612 LICC 170 pH 0508 LICC 130 pH 0306 105 pH LICC 0612 60 pH 0508 LICA 50 pH 25 pH 0 1980s 1990s Figure The evolution of Low Inductance Capacitors at AVX values given for a 100 nF capacitor of each style LOW INDUCTANCE CHIP CAPACITORS The total inductance of a chip capacitor is determined both by its length to width ratio and by the mutual inductance coupling between its electrodes. Thus a 1210 chip size has lower inductance than a 1206 chip. This design improvement is the basis of AVX’s low inductance chip capacitors, LI Caps, where the electrodes are terminated on the long side of the chip instead of the short side. The 1206 becomes an 0612 as demonstrated in Figure In the same manner, an 0805 becomes an 0508 and 0603 becomes an This results in a reduction in inductance from around 1200 pH for conventional MLC chips to below 200 pH for Low Inductance Chip Capacitors. Standard designs and performance of these LI Caps are given on pages 46 and 1206 0612 Figure Change in aspect ratio 1206 vs. 0612 LOW INDUCTANCE CHIP ARRAYS Further reduction in inductance can be achieved by designing alternative current paths to minimize the mutual inductance factor of the electrodes Figure This is achieved by AVX’s product which was the result of a joint development between AVX and IBM. As shown in Figure 4, the charging current flowing out of the positive plate returns in the opposite direction along adjacent negative plates. This minimizes the mutual inductance. The very low inductance of the LICA capacitor stems from the short aspect ratio of the electrodes, the arrangement of the tabs so as to cancel inductance, and the vertical aspect of the electrodes to the mounting surface. Net Inductance Net Inductance Figure Net Inductance from design. In the standard Multilayer capacitor, the charge currents entering and leaving the capacitor create complementary flux fields, so the net inductance is greater. On the right, however, if the design permits the currents to be opposed, there is a net cancellation, and the inductance is much lower. |
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