Electronics Forum | Thu Nov 20 13:00:36 EST 2008 | jameskelch
Calling out materials by name locks you into laminates by brand. If these are typically phenolic materials it can lead to moisture absorption, less mechanical strength and more prone to delamination during assembly. It is more effective to refer
Electronics Forum | Mon Jul 07 09:00:50 EDT 2008 | josh_brubaker
These images are of two melted matrix trays, full of BGA components, which were left to bake in an oven over the weekend. The oven temperature controller was not checked after a recent power failure and reached a temperature of 715�F. The two trays m
Electronics Forum | Mon Sep 15 06:14:49 EDT 2008 | milas
Hi Has anyone experienced laminateand BGA cracking on ENIG finish boards built using a lead free process? The laminate is cracked directly underneath the pad where the solder joint has cracked. We have confirmed the cracking via Microsectioning. We
Electronics Forum | Thu Mar 05 09:46:12 EST 2009 | davef
Solder mask requirements: * IPC-6012 and IPC-SM-840 contain detailed specifications and information regarding solder mask requirements. * IPC-A-600 defines acceptability of printed boards [analog of A-610 for board assemblies]. Why can't you use A-6
Electronics Forum | Thu May 07 23:02:35 EDT 2009 | cusackmusic
Bob has been very helpful so far. He was very reasonable on the price for the manual too. I think I'll have this thing in production by Monday Morning! So far I've replaced the 5V Power Supply, re-aligned the X and Y, and re-laminated the table to
Electronics Forum | Thu Aug 20 14:52:40 EDT 2009 | davef
Armando: We're guessing that the white residue is on the laminate also. We believe that the residue has something to do with your low residue flux and water. It could be: * Water contamination in the flux. * Poor selection of preheat temperature that
Electronics Forum | Fri Dec 10 01:02:36 EST 2010 | sparrow
Hello, our products are made on single-sided boards and we often have problems with receiving too warped PCBs from our suppliers. Can anybody suggest a good laminate or the most important properties of the material so we could specify it when we orde
Electronics Forum | Fri Dec 17 02:43:24 EST 2010 | grahamcooper22
Ideal storage conditions to stop pcbs absorbing moisture is at less then 5% RH, for example in sealed moisture barrier bags. You mention that storage was at 40~70%...at these levels the pcb will absorb quite a bit of moisture. Your baking time was no
Electronics Forum | Wed May 25 21:03:30 EDT 2011 | thanhnguyen22
Hi All, I am new the PCBA process fabrication. I have found many cracks in the PCB after we have cross sections analysis. The cracking has same kind of pattern. It happens betwen the solder and the PCB, or between the solder and the part, BUT not be
Electronics Forum | Wed Jun 01 01:08:43 EDT 2011 | boardhouse
Hi Aj, for the most part we have gotten away from calling out specific material and instead calling out IPC4101 back slashes to needed requirements. But if you are just looking for what most domestic shops have switch to you would be looking at 370
