Electronics Forum | Mon Jun 25 21:02:42 EDT 2001 | davef
Try: 1 SMTA [http://www.smta.org] Knowledge Base Conference Proceedings: * 09/24/2000 COMPARISON OF AG, NI/AU, AND SOLDER PWB SURFACE FINISHES ON THE SECOND LEVEL RELIABILITY OF FINE PITCH AREA ARRAY ASSEMBLIES Lon E. Chase, Raytheon Electronic Syste
Electronics Forum | Fri Jun 18 12:20:16 EDT 1999 | John Thorup
| Now don't everyone jump on this at once, but it seems time for me to send out copies of my not even close to being dated copy of an article about HASL. Though it was published in 1992, in Printed Circuit Fabrication Magazine, and it got rave review
Electronics Forum | Thu Sep 02 15:45:35 EDT 2004 | russ
We don't do any wave, SMT only. We did not have to change apertures for lead free, we use the same stencil that we did when we ran water soluble with pb. This I think might be dependant upon your current design of both pad and apertures however.
Electronics Forum | Thu Dec 09 09:51:34 EST 2004 | russ
One of the things that I have found is the "benchtop/lab" type waves (Low cost) do not perform very well except on the simplest of products, they are lacking critical design elements such as adequate preheat length, laminar flow nozzle design, etc.
Electronics Forum | Wed Jul 12 21:47:41 EDT 2000 | Dave F
Celiav: Mark is probably spot-on on his comments about a board fab problem. It is weird that you have similar problems from two suppliers though. Recommendations are: � Get rid of any bird brain contractor that installs processes that affect your
Electronics Forum | Tue Apr 03 22:03:18 EDT 2001 | davef
With friends like you, who needs enemies? I�d guess that the perceived benefits of flat pads for your 20 mil pitch and below components counter-balance the higher cost, gold being a solder pot contaminant, limited solder mask compatibility, potentia
Electronics Forum | Mon May 14 17:14:07 EDT 2001 | davef
First, consider checking the fine SMTnet Archives. Look for threads on "white tin", in addition to "immersion tin". We�ve had a cuppla good ones of late. Merix [http://www.merix.com] gives a good comparison of different solderability preservatives
Electronics Forum | Fri Jun 18 14:07:50 EDT 1999 | Earl Moon
| | Now don't everyone jump on this at once, but it seems time for me to send out copies of my not even close to being dated copy of an article about HASL. Though it was published in 1992, in Printed Circuit Fabrication Magazine, and it got rave revi
Electronics Forum | Fri Jul 18 10:46:43 EDT 2003 | davef
If you are saying that you have discolored white tin at in-bound inspection, you have bad boards. The boards are fabricated incorrectly. Your fabricator is deficient. That is the GREAT thing about imm coatings. You can look at them and determine
Electronics Forum | Thu Jan 27 16:43:15 EST 2005 | russ
Ther is a solder alloy out there that is supposed to allow lead free wave processing without having to upgrade pumps and such or increasing the pot temp (direct drop in). I have not used it nor do I plan on doing leadfree wave soldering but you may
