Electronics Forum | Thu Jun 14 22:50:45 EDT 2001 | gregH
Hi, I read an article that says "Flux selection usually depends on the following factors": a) Solderability of pcb base metal or coating b) Corrosivity of vapours and residues c) electrical resistivity of residues d) Ease of removal of residues e)
Electronics Forum | Fri Jun 15 09:13:53 EDT 2001 | jackofallprocesses
Does anyone have knowledge or experience with Pin & Paste on boards that are .095" thick? The boards would have mixed technology, PTH, fine pitch, and BGAs. I did a search for this info and nothing touches on this particular subject, thicker boards.
Electronics Forum | Mon Jun 18 22:04:01 EDT 2001 | davef
YA DON NEDA YELL!!! AHYAINT DAFF YANO!!! Printing adhesive near fine pitch devices can risky. Be careful. Look here to get started: http://www.alphametals.com/products/techarticles/soldrpstncl/guidelines.html [I know this link is expired, but may
Electronics Forum | Mon Jun 18 11:23:44 EDT 2001 | Gil Zweig
BGA defects observed with x-ray inspection fall into catagories. One catagory is the obvious defects; i.e. soledr bridges, missing balls, excessive solder voids. The second catagory is the more subtle "potential" defect. This is where variations in
Electronics Forum | Mon Jun 18 11:34:00 EDT 2001 | Gil Zweig
As you probably have discovered, the cost of x-ray inspection systems can run anywhere from $35,000 to $350,000 or more depending on if you want an In-line or off-line system. Assuming ,in your facility, you want an off line system, then the next con
Electronics Forum | Wed Jun 20 12:07:13 EDT 2001 | Steve
I would suggest getting a copy of IPC-SM-782A, Surface Mount Design and Land Pattern Standard, and IPC-7525 Stencil Design Guidelines. My experience is that reflow does not cause tombstoning very often. Pad and land design, paste volume, and placemen
Electronics Forum | Sat Jun 23 12:42:20 EDT 2001 | genny
OK, to reopen this and muddy the water a little more, What is the difference between REL0 and ROL0 solder. The solder paste that more than one of our suppliers is using is AIM293+ - this is REL0 The no-clean solder wire we use in house is ROL0, mad
Electronics Forum | Mon Jun 25 20:35:44 EDT 2001 | davef
According to J-STD-004 "Requirements for Soldering Fluxes", fluxes are classified by their chemical composition, activity level and halide content. In this scheme, each flux type is identified by a 4-character designator, where: * First two character
Electronics Forum | Wed Jun 27 10:17:46 EDT 2001 | genny
OK....I now fully understand the difference in chemical makeup between rosin and resin. But....can you, or would you, mix them without any concern? Could you or someone please just give me a straight yes or no answer? Please? Of course,... I woul
Electronics Forum | Mon Jun 18 19:57:40 EDT 2001 | Gil Zweig
Dave: You pose a very good question. We have been in the electronics x-ray inspection business for 18-1/2 years and, to date, we have not received a single report of damage associated with x-ray exposure. However... we do see signs of long term x-ra
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