Electronics Forum | Tue Jun 03 09:04:38 EDT 2003 | Mike F
Do a search in the archives on conformal coating and silicone conformal coat. A variety of companies make conformal coatings and the equipment to apply it. Coatings can be applied by dipping the board into the coating, brushing it on, or spraying i
Electronics Forum | Tue Jun 03 13:01:16 EDT 2003 | Ramanandkini
We have some experience in manual application of conformal coating using a brush that too for small circuits espceially on the soldered pads. We use Chase corporation's Humuseal 2A64. This passes high humidity tests. I am also in touch with Lackwere
Electronics Forum | Wed May 28 08:25:08 EDT 2003 | davef
That's what we do [no more than three reworks or mods]. Your "four reworks permissable" was probably based on the 55110 five thermal cycles, counting wave soldering as the first cycle. How do you plan to keep track of each of those rework actions?
Electronics Forum | Thu May 29 14:21:22 EDT 2003 | swagner
Thanks for the clarification, I have worked with both application, especially pre reflow. The data you should consider collecting pre reflow is missing, skew degrees, x,y shift, bill boarding, polarity and match the failure data (ref. desg.) to feed
Electronics Forum | Fri May 30 18:57:44 EDT 2003 | russ
We place a large amount of .4mm (what is that in microns?)QFPs every day. I would much prefer a BGA package. Reasons are 1. Pitch is greater which provides a larger process window 2. Alignment is easier because you don't need vision for BGA if you
Electronics Forum | Thu Jun 05 16:44:19 EDT 2003 | blnorman
The data we have is from an IBM report. Below 100�C the SAC reliability is almost double that of SnPb (-40 to 100�C thermal cycle). When the upper end temp is increased to 125�C the reliability drops to 75% of SnPb. I'd like to see the data that s
Electronics Forum | Fri May 30 17:05:57 EDT 2003 | jonfox
Back from my days at a CM, the setup fee was only used for first time customers. Basically this was to ensure that if the relationship was to be permanent, all data formats, documentation, and special issues were taken care of. This requires extra
Electronics Forum | Fri Jun 06 16:11:25 EDT 2003 | RF Lurker
I understand that there may not be a lot of material on this, as most threads I've seen discourage doing it. It goes against DFM to do it. But I wish to use a large copper area instead of heat sink and thermal epoxy to cool a regulator. But I can'
Electronics Forum | Fri Jun 06 18:44:26 EDT 2003 | davef
No, no. It's koscher to have thermal planes. You just need to: * Work with your fabricator to keep the layup balanced. * Relieve the plane so that it doesn't cause assembly problems. While probably not directly for your part, it gives a starting p
Electronics Forum | Wed Jun 04 06:37:10 EDT 2003 | cdowny
I am looking into pick and place for medium to medium-high production with semi frequent changeovers. I have been looking for a little while and nosed around at APEX also. I am not interested in any used products, I have been down that road before
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