Electronics Forum | Fri Jun 21 12:59:20 EDT 2002 | stepheno
When you say well designed for wave, does that include "extra" solder pads for the IC's for solder thieving? And Boards that are well designed for wave don't have QFP's on the bottom. They might be ok but then the board would be "ok for wave", but no
Electronics Forum | Sun Jun 23 23:23:25 EDT 2002 | beldorian
First question - I am making an assumption that after "de-pop'ing" a BGA prior to socketing the thing to test it, the best known practice is to re-ball the thing. Is this an industry standard? Second question - If it is an industry standard, does a
Electronics Forum | Mon Jun 24 19:15:13 EDT 2002 | Chris C
Do I really need a Vapour Phase Oven or a Nitrogen Oven when soldering PBGA's if my PCB has only 2 to 3 BGA's (ball pitch of 0.5mm to 1.27mm) ? Is the quality of soldering when using an 8-Zone Convective Oven is not acceptable? I have been bombarded
Electronics Forum | Wed Jun 26 08:53:32 EDT 2002 | davef
We have not done a DOE on board warping. Consider: * How close the board gets to its Tg during the reflow cycle * Amount of copper on each side and the balance between the two * Thickness of the board * Overall length x width * Time at temperature
Electronics Forum | Tue Jul 02 21:47:44 EDT 2002 | alex_kirichenko
Hello everybody!!! We are going to start loading 0402s and I'm looking into all diffirent sorts of problems. From this forum I see that tombstoning is the main one. I found article about using U-shape appeture design for 0402s. I never had stenc
Electronics Forum | Wed Jul 03 14:08:10 EDT 2002 | gbriceno
I' designing a PCB with SMD components to optimize the land patterns for wave soldering. I find that the IPC-SM-782 land patterns are not robust enough for wave soldering, yielding ramdom skips and bridges. This PCB will also give me insight on sha
Electronics Forum | Mon Jul 08 08:49:51 EDT 2002 | pjc
Interesting study. It shows no-Pb alloys having a greater negative environmental impact. I wonder if the Euros are re-thinking their no-Pb regulations? I also wonder if popular opinion and politics is at the route of our EPA's no-Pb regulations and n
Electronics Forum | Wed Jul 10 13:33:40 EDT 2002 | bentzen
Hi You might be right that the ban will go ahead eventhough some indications, like the report from Germany, show it will be an environmental drawback. In Denmark I�m aware of 2 lead-free invetigating projects on the way. I participate in one of t
Electronics Forum | Tue Jul 16 04:38:23 EDT 2002 | bayanbaru
Hi, Is there any ESD system that do not requires the ESD wrist/heel strap testing? You see one problem we face is meeting the wrist strap testing compliance. There bound to have some operator fail to carry out the wrist strap test. How can we preven
Electronics Forum | Mon Jul 08 09:52:37 EDT 2002 | gdstanton
Folks, Looking for some feedback from anyone who has had experience with panelized or palletized CCAs, or anyone interesting on commenting, where interconnects were used to facilited a "gang" incircuit and functional test. We are considering implem
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