Electronics Forum | Wed Mar 04 11:16:25 EST 2009 | patrickbruneel
From your description of the problem first reduced SIR to dead short is exactly what happens with dendrite growth. What is needed to form them is low bias voltage (10 volt range is ideal with low current), a surface, 2 conductors (containing tin), io
Electronics Forum | Tue Feb 19 08:49:34 EST 2008 | rgduval
Get the ionic specs from your flux manufacturer, and show it to the designer. No-clean flux/solder is supposed to be low to minimal in ionic contamination, which allow the whole no-clean thing. If he needs further proof, you can have the board io
Electronics Forum | Wed Mar 20 20:02:06 EST 2002 | davef
Surfactant. A synthetic detergent made from petrochemicals that lowers the surface tension of water and allows better cleaning in small spaces. Do you have a cleaning issue that requires you to use a surfactant? If so, be aware that you must clean
Electronics Forum | Sat Sep 26 19:09:17 EDT 1998 | Graham Naisbitt
As an addendum to Daves posting, please consider that: There is no such thing as no residue fluxing. A no-clean must herefore, have benign residues - in other words, they are not as efficient at removing surface oxides to enable good solder joints. S
Electronics Forum | Sat Sep 25 07:07:02 EDT 1999 | Brian
| I need a memory jog. What is the term for the growth of conductive contamination after a board is in storage or field? | There are several different mechanisms which can cause this. In reality, ionic contamination is the root cause for many of the
Electronics Forum | Wed Feb 20 08:57:13 EST 2008 | tonyamenson
We test for board cleanliness using an ionic tester. It's been my experience that if your board is clean you take away the possibility of growth even if the unit encounters moisture. We actaully had a problem where our wash lost pressure due to a mi
Electronics Forum | Fri Jun 01 10:52:37 EDT 2012 | blnorman
Neither the Omega meter nor the IC are officially "destructive" tests, but everywhere I worked we treated them that way. The boards were scrapped after the test. The Omega meter can be tested at elevated temps, but the IC sample is extracted at ele
Electronics Forum | Thu Sep 17 12:08:13 EDT 1998 | Graham Naisbitt
Wayne, I think Dave and Justin are correct but I would just add my twopennworth: Your customer presumably wants to know if the end-product will be reliable? If he/she wants you to prove cleanliness, ask them for the spec they want to work to and app
Electronics Forum | Thu Aug 05 06:29:18 EDT 1999 | Graham Naisbitt
| | | We're getting field failures in a high impedance portion of the circuit. Think the unpopulated pc card has contaminates because we were able to grow dendrites by applying a 9 volt battery across the suspected pad, placed a drop of de-ionized w
Electronics Forum | Thu Apr 14 12:48:54 EDT 2005 | russ
boards greater than this spec. can cause latent failure, Do not confuse no-clean assembly materials (nocleaning required) vs. clean chemistries that must be cleaned. You do not want ionic contaminants on your products.
