Electronics Forum | Thu Sep 19 10:15:36 EDT 2013 | sara_pcb
We have a PCB to be populated using reflow soldering. The board contains lead free BGA device(11x11, 1mm pitch ) and Standard SMT devices which are not lead free. Since profile temperature is different for both devices, our contract assembly house is
Electronics Forum | Tue May 08 03:14:12 EDT 2001 | sinclair
We started our first ENIG process recently and to our surprise, we have many failure on the one and only BGA on the board. The BGA is a 31 mils pitch plastic. Sending the PCBA to 1 cycle of heating/cooling @ 70/-5 degree C yield 40% of failure. With
Electronics Forum | Mon Aug 21 20:25:19 EDT 2000 | Dave F
Doug: I guess every solderability preservative has it�s fans. You know what the issue is? � A supplier that makes it�s customer happy by doing a good job processing material!!!! I�m a HASL guy myself � too much heartache with the other stuff. Giv
Electronics Forum | Thu Sep 02 12:01:49 EDT 1999 | stefano bolleri
| Could someone shares their experience on the causes of 'Open' in the BGA after reflow. | | Are you talking about "primary" process or rework? Are you sure you have not clogged apertures on your stencil? What is the pitch of the balls? My experie
Electronics Forum | Mon May 07 16:07:05 EDT 2012 | davef
Start with targets based on the stencil thickness (for height) and stencil thickness times the aperture size (for volume). * Set reasonable upper and lower control limits (+ 25% and –25 % of the targets, for example). * Next, check the printer set-u
Electronics Forum | Thu Jun 21 10:47:55 EDT 2001 | caldon
Glenbrook has a solution. I do not know what your definition of low cost is but Glenbrook offers an inspection solution an x-ray system and an endo scope (ersa scope type) for low cost. Contact Steve zweig at (973) 361-8866. They have some great soft
Electronics Forum | Wed Oct 20 16:05:47 EDT 1999 | Mark Charlton
I knew this would happen. Someone wants to rework a bad BGA artwork by cutting a trace and adding a wire under a 292p 1.27mm pitch PBGA. Has anyone done this before? What kind AND size wire do you use? How do you hold it in place during the replc
Electronics Forum | Thu Jan 26 17:59:07 EST 2006 | GS
How is RH% inside your Dry Cabinet ? What is the most critical MDL of your MSDs soldered on your board ? Best instructions about Handling of MSD you can get from Standard J-STD-033B/C. The defects you encountered at test it could be moisture absor
Electronics Forum | Tue Sep 01 10:16:10 EDT 1998 | Mike Cox
| | We are experiencing shorting on a BGA. The part has a 1mm pitch with a 196 I/O count. The problem seems to pop up without warning & disappear in the same manner. | | Our pad design is .020" diameter pads with .025" solder resist diameter. Th
Electronics Forum | Mon Apr 26 12:03:22 EDT 1999 | Justin Medernach
| Help Guys!! | | We sub con assemble small to medium batch runs of mixed tech boards inc fine pitch BGA o4o2 etc. | | As usual we get all the crap to build that no-one else wants, however lately some customers are getting a little more serious wit
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