Electronics Forum: pad size (Page 1 of 89)

BGA pad size

Electronics Forum | Tue Jun 14 14:18:56 EDT 2005 | davef

Send the vacation pix, pls

BGA pad size

Electronics Forum | Tue Jun 14 15:18:13 EDT 2005 | jdumont

How do I send pics....sorry for the ignorance.

BGA pad size

Electronics Forum | Tue Jun 14 20:03:06 EDT 2005 | davef

click on the email link, next to the Lou Reed icon, then paste the pix in the form

BGA pad size

Electronics Forum | Tue Jun 14 18:26:32 EDT 2005 | GS

You can find useful informations also on last review of IPC-7085 : Design and Assembly Process Implementation for BGA. Regards GS

BGA pad size

Electronics Forum | Tue Jun 21 11:46:04 EDT 2005 | kenscj

Hi dave, Thanks for the comment. I have another issue. The board already pass Test and Burn-In processes, but after 2 months the BGA contact is found open (no contact on certain balls). How can that happen? Is it during build, the solder ball alrea

BGA pad size

Electronics Forum | Fri Jun 17 07:38:59 EDT 2005 | jdumont

Thanks for taking a look at the pics. I have made my thoughts on this type of design known to all. Im going to let this run through and have them put a note in the file for this board to reduce the trace size for the next time the board gets rev'd up

BGA pad size

Electronics Forum | Tue Jun 14 08:37:18 EDT 2005 | jdumont

Morning all, just took a look at a new board we just got in and the there are different pad areas under the same BGA. What happened is engineering uses wider trace sizes for some pads and those overlap when more than one go to the same pad. This caus

BGA pad size

Electronics Forum | Fri Jun 17 23:31:12 EDT 2005 | kenscj

Hi all, currently, we are seeing BGA problem like solder ball misalign, void, solder short (all under BGA, tested with 5DX), after reflow. We examine the solder ball (raw material of BGA), and see that the ball surface is not smooth, will that affe

BGA pad size

Electronics Forum | Thu Jun 16 18:16:32 EDT 2005 | davef

Josh: You're correct it's tough to describe the layout of the BGA pads and traces. We wouldn't be too excited about seeing this board either. On one hand, for the obvious lack of care taken in doing the layout, this is a junk board and you shouldn

BGA pad size

Electronics Forum | Sat Jun 18 08:03:58 EDT 2005 | davef

kenscj: Responding to your points of interest: * On the smoothness of BGA solder balls causing solder ball misalign, void, solder short after reflow: We expect the solder balls to be smooth and have no sharp irregularities. We can't recall attribut

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