Re: [SI-LIST] : BGA pin location

Meher Venkateshwarlu Vemaraju (meher@cisco.com)
Mon, 19 Jul 1999 18:03:50 +0530 (IST)

Hi,

I think you are talking about the BGA package mounted on a PCB, Right.
I fear you can not just locate the power pins of a BGA component after
mounting. Once we had problems and had to access some pins on a BGA part
We did a rework by removing the BGA and wire the pins out.
Then we thought of providing testpoints for un used signals which we
thought of as imp.
Hope this helps

Thanks,
Meher

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> Does anyone help
> how to locate the power,GND pin on BGA Package?
>
> Espetially it should be located on outer lead or inner .
> (Which is more important to consider the factor of location with
> BiPath-capacitor
> that is to locate the BiPath-cap is on the same side, cause the distance
> between BGA package and the BiPath-cap without Through-hole connected to
> inner Plane of Power or just distance with Through-hole to the opposite
> side
> capacitor (on the solder side)?
>
> I'm sorry I'm not good at writing english.
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> <BODY bgColor=3D#ffffff>
> <DIV><FONT color=3D#000000 size=3D2>Does anyone help </FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2>&nbsp; how to locate the power,GND =
> pin on BGA=20
> Package?</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
> <DIV><FONT color=3D#000000 size=3D2>Espetially it should be located on =
> outer lead or=20
> inner .</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2>(Which is more important to consider =
> the factor=20
> of location with BiPath-capacitor</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2></FONT><FONT color=3D#000000 =
> size=3D2>&nbsp; that is=20
> to locate the BiPath-cap is on the same side, cause the=20
> distance&nbsp;</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2></FONT><FONT color=3D#000000 =
> size=3D2>&nbsp; between=20
> BGA package and the BiPath-cap without Through-hole connected=20
> to&nbsp;</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2>&nbsp; inner Plane of Power&nbsp; or =
> just=20
> distance with Through-hole&nbsp; to the opposite side</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2>&nbsp; capacitor (on the solder=20
> side)?</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
> <DIV><FONT size=3D2>I'm sorry I'm not good at writing=20
> english.</FONT></DIV></BODY></HTML>
>
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