Electronics Forum | Fri Apr 16 09:40:04 EDT 1999 | Gerry G
While trying to sell me a low temperature baking system for SMDs the salesman mentioned that the 125C for 24hr bake had been known to cause co-planarity defects. I thought I'd ask some experts. Any help guys?
Electronics Forum | Sat Jan 19 02:29:11 EST 2002 | ianchan
Thanks for the tips... found out the ex-employee guy, had pre-bake conditioning put into the process flow, as this pcb is made of polymide material, that is reputed to have historical patterns in thermal sensitivity. To avoid "thermal damaging" the
Electronics Forum | Mon Jun 28 09:15:21 EDT 2004 | jdumont
Morning all, we have been seeing some problems with the edges of some of our BGA's curling away from the PCB after reflow. Is this possibly a moisture problem? If so what would be a good time/temp to bake them at to rectify the problem? Thanks in
Electronics Forum | Thu Jan 17 20:33:05 EST 2002 | ianchan
Hi, Can anyone help explain the benefits/disadvantages of bareboard pcb baking, as part of the pre-heat conditioning, before the bareboard pcb use in SMT production run? The pcb board is 200mm x 240mm panelized pcb board, and has 28 smaller pcb boa
Electronics Forum | Mon Jun 28 15:03:43 EDT 2004 | jdumont
If you dont mind me asking, what are you guys using to keep your IC's dry??
Electronics Forum | Mon Jun 28 15:11:29 EDT 2004 | davef
McDry seems be a good unit to consider.
Electronics Forum | Mon Jun 28 10:02:06 EDT 2004 | fmonette
The answer is yes, it is possibly a moisture-related problem. You can confirm this by baking your parts at 125C for 48 hours (ref. J-STD-033A, table 4-1). For more technical background on this issue I recommend you read the following paper : Impac
Electronics Forum | Mon Jun 28 10:04:41 EDT 2004 | jdumont
Yes please send a copy of that paper as I dont have access to the 033 STD. That would be great, thanks a lot. firstname.lastname@example.org JD
Electronics Forum | Mon Jun 28 14:45:50 EDT 2004 | davef
JDumont: In trying to find the paper that Francois referenced, poke around his site [ http://www.cogiscan.com ], where he's collected a bunch of papers on the control of moisture sensitivity in components.
Electronics Forum | Mon Jun 28 15:27:33 EDT 2004 | davef
Oh, you posted something about that a couple of weeks ago. Nice that you have the justification, too bad that's the way you needed to get it.