[SI-LIST] : RE: Another decoupling question

Ingraham, Andrew (Andrew.Ingraham@compaq.com)
Thu, 16 Sep 1999 11:28:45 -0400

>I have recently heard about capacitors that are supposedly thin enough to
fit under a standard MBGA package

Not BGA, but I have seen thin caps mounted under DIPs. The dielectric
material they used (Z5U or Y5V? I forget now) was not quite as good as the
better chip caps, so capacitance falls off faster at higher temperatures.
And they do get hotter since they are nearly in contact with the chip.

They were a space-saver, but we did no direct comparison to see how the net
result compared, noise-wise.

Andy Ingraham

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