Electronics Forum | Fri Nov 07 11:32:36 EST 2003 | Gabriele
we experimented round pad for 0402, it improves chip self alignment and reduce tomb stone effects. On 0603, half round shape also gave guud results. G
Electronics Forum | Wed Dec 08 17:58:44 EST 1999 | Dave F
Dave: You should see a solder smudge on the gold plating where the ball was attached, if there is (was) solder reflow during either the (1) BGA fabrication, (2) your BGA attach, and / or (3) your BGA removal. You rework will not remove the solder
Electronics Forum | Mon Oct 11 15:21:20 EDT 2004 | russ
I have heard of making square apertures for round pads to aid in Xray and possibly allow for better release in some applications. The square aperture in your case would be for Xray inspection and not release. Usually a 20 mil square would be used f
Electronics Forum | Thu Mar 19 12:22:54 EDT 2009 | mhjohnso
While investigating a routing study for a new bga device, I found the vendor used round 20 mil pads on 0402 decoupling caps.This allows fitting the caps between break out vias on their 1mm pitch BGA. Round pad gives about 8 mils diagonally from pin t
Electronics Forum | Wed Mar 03 11:30:18 EST 1999 | dave reese
Are square pads more difficult to wavesolder than round pads? I am referring to a through hole board.
Electronics Forum | Wed May 29 11:11:16 EDT 2002 | jax
Are you using Diamond apertures to achieve a volumn you cannot get through round ap's?
Electronics Forum | Tue Jun 04 12:33:57 EDT 2002 | dason_c
We use the diamond shape on the CBGA/CCGA only, all the PBGA are using the regular round shape.
Electronics Forum | Thu Feb 27 10:12:46 EST 2003 | Stephen
I've had good luck with round pads, for 0603 and 0402.
Electronics Forum | Wed Feb 28 17:42:43 EST 2001 | lileubie
I've used round and optimized ovate pads for the majority of boards used in prior companies. Study after study has proven excellent reliability. Why your sample has both apertures, I could only guess that your customer is testing both. Have you e
Electronics Forum | Wed Aug 29 11:09:01 EDT 2001 | rmerk
Dave, We are using tab nibblers right now, but they have a hard time with round boards. FKN has a model(N200) that shears the tabs off. The cost is fairly low(3K). I just wanted to know if there are any other brands out there that might work on rou
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