Electronics Forum | Mon Oct 31 19:37:16 EDT 2022 | emeto
Just because you can't add copper to the board, doesn't mean you can't add copper to the panel. Redesign panel, where board house can add copper to the panel to balance the board a little better. I would advise against low melting solder alloys on cu
Electronics Forum | Mon Aug 21 16:36:14 EDT 2023 | merliniass
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Electronics Forum | Thu Feb 17 21:45:26 EST 2000 | Dave F
Steve: Wadja mean "I fixed it, now tell me what I did to fix it." Steve, you�re one scary guy. ;-) "Steve�s Longer Pad Theory" - Stubby pads will not make solder flow-up the leads of a QFP100, leaving sparse solder on the pads. Given a choice, s
Electronics Forum | Thu Feb 17 21:45:26 EST 2000 | Dave F
Steve: Wadja mean "I fixed it, now tell me what I did to fix it." Steve, you�re one scary guy. ;-) "Steve�s Longer Pad Theory" - Stubby pads will not make solder flow-up the leads of a QFP100, leaving sparse solder on the pads. Given a choice, s
Electronics Forum | Tue Sep 18 11:34:36 EDT 2001 | jschake
The tightest spacing between neighboring 0201 components assembled was 8-mils. Please refer to the response for the query entitled �Minimizing Tombstoning Defects� posted by martys, as the response provided there is also relevant to address this que
Electronics Forum | Tue Jan 08 22:48:58 EST 2008 | davef
Maybe these folk can help you with your MTM issues. http://www.mtm.org We appreciate the desire to balance the line with respect to standard insertion time, number of insertions, and number of assemblers. In reality there are too many variables fo
Electronics Forum | Mon Jan 08 20:26:12 EST 2001 | Dave F
Ask your supplier if he will guarantee to cover rework, warranty, and lost business costs, if he's incorrect. Below 2uinch gold is very pourous and not worth anything in preventing corrosion of your nickel undercoat. 3 uinch has to be the absolute
Electronics Forum | Fri Oct 20 13:57:35 EDT 2000 | Greg Amero
Most LCD manuf. specify not to wave or reflow. I believe this is because of the prolonged exposure to the preheat temp. However, about three years ago, we were running about 350/wk of a 40P DIP LCD through the wave with no fallout. It did stress t
Electronics Forum | Thu Mar 22 15:44:50 EST 2001 | pteerink
I have a board with QFP240 plastic package exhibiting the same characteristics. Minimum heel fillet that doesn't change with stencil mods, paste change, profile change etc ( I am working to class 2, though, so my pass spec, although they are not pret
Electronics Forum | Thu Mar 22 15:45:20 EST 2001 | pteerink
I have a board with QFP240 plastic package exhibiting the same characteristics. Minimum heel fillet that doesn't change with stencil mods, paste change, profile change etc ( I am working to class 2, though, so mine pass spec, although they are not pr
