Electronics Forum | Wed Oct 24 02:09:34 EDT 2018 | simondsr
Hi everyone, I am new to this SMT. I have just graduated my study, have zero experience in SMT industry as I studied Automotive before. Ok lets proceed to the main objetive, I have a question regarding package rebake. From what I have learned, the
Electronics Forum | Wed Jan 09 01:22:39 EST 2019 | kenneth0
Hi Simond, The baking process is likely to remove any moisture after the cleaning process. We wouldn't want any moisture trapped as this might cause delamination if the package is subject to subsequent heating/reflow process. Hence there's a staging
Electronics Forum | Fri Nov 02 17:23:52 EDT 2018 | cbart
are these requirements outlined by your company or the manufacture of the part? if its your company is the product tested? if so the test guys don't usually like to power things up with water trapped in them or under them as it can cause some problem
Electronics Forum | Fri Nov 02 19:34:19 EDT 2018 | sarason
I am assuming that your application is Automotive. The logic here is that the product has got to at least run for 8 years or more. The prebake removes any moisture that may creep into the product during the wait time. A little moisture combined with
Electronics Forum | Tue Mar 03 14:07:07 EST 2009 | macisaint
I'm having shorts appear on my QFN packages between pins, usually only after a week or so of power-on operation. The shorts are 1K and slowly down to hard shorts over time. Typically a defective part will have failures on multiple pins. I tried havi
Electronics Forum | Fri Mar 06 10:32:34 EST 2009 | fountain42
Yes, We've already experienced this same problem. 1) What kind of flux are you using? No Clean? Rosin? OA? 2) If it's OA, What kind of water wash do you do? Do you use DI water? How Hot? Who's machine? What are the pressures? 3) Have you performed a
Electronics Forum | Mon Jul 01 08:06:22 EDT 2013 | sarason
There is my shareware package PCBSynergy https://pcbsynergy.com It doesn't do spliting out of the box but you can split the file in Excel and then re-import. All up board prep less than 5 minutes. There are also quite a few commercial packages suc
Electronics Forum | Fri Sep 16 09:14:29 EDT 2005 | actech
We have just launched a new contract assembly house and I was wondering if there was anybody out there that had an honist formula for calculating labor cost for the purpose of bidding assembly work, "is there a good canned software package that actua
Electronics Forum | Thu Sep 07 03:57:39 EDT 2000 | Steven Cheung
Does anyone know of a freely-available document which discusses the main considerations of BGA assembly and inspection (x-ray?). l need to know about pad sizes and inspection standards and when to underfill and when not to etc.. l am looking at ass
Electronics Forum | Wed Apr 23 19:00:39 EDT 2008 | stevek
It depends on the laminate but a PWB is like any other MSL component. Some fab shops are only waranting standard FR4 laminates for 45-60 days when processed at lead free temperatures. The best thing I can say is to try some weight gain/loss experim
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