[SI-LIST] Re: BGA Fan Out
- From: "Dimiter Popoff" <dp@xxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 14 Nov 2005 20:34:41 +0300
I would suggest 0.5mm pads, so two 4 mil (apr. 0.1 mm) traces can come out
between the pads . Drilling with 0.3 (apr. 0.2 after plating with a 0.4 mm pad
for 1.27 spaced BGA has been done for me 5 years ago and is being done now,
but since the 0.4 rather than 0.5 won't buy another trace you will be better
off at 0.5. Whether the whole mess is routable on two layers is of course
another matter... I have enough overhead routing at 3 traces between pads
with 1.27 BGAs, but it may well be (not easily) doable.
Good luck,
Dimiter
------------------------------------------------------
Dimiter Popoff Transgalactic Instruments
http://www.tgi-sci.com
------------------------------------------------------
> -------Original Message-------
> From: Fred Townsend <fred@xxxxxxxxxxxxx>
> Subject: [SI-LIST] BGA Fan Out
> Sent: Nov 14 '05 20:17
>
> I have a client that is proposing the following for his BGA fan out.
>
> BGA = 17 x 17 x 1mm with 0.6mm pads
>
> power is applied to the inside 9x9 grid leaving 4 rows, each side, on
> the outside for signals.
>
> 4 layer stackup = sig/gnd/3 voltage split plane/sig with 4 mil sig to
> plane spacing
>
> vias are limited to a 10 mil drill size
>
> min trace to trace = 4/4/4 mils
>
> has anyone ever heard of doing such a thing?
>
>
> Fred Townsend
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