Electronics Forum | Fri Nov 28 04:46:45 EST 2003 | gregoryyork
Best to establish what type of residue is causing this problem and then stamp it out.Speak with SCOPE Labs who offer PCB extraction followed by IR and IC work. So many problems with porous resist at present and NON ionic materials that you really nee
Electronics Forum | Thu May 06 08:59:25 EDT 2004 | davef
Even with PbSn solderpaste the leadfree BGA's have a superior resistance to solder-joint fatigue failure when compared to conventional parts. [Solder Fatigue Reliability Issues in Lead Free BGA Packages, Pedro Chalco of IBM, Pan Pacific Microelectron
Electronics Forum | Thu Jul 03 03:23:04 EDT 2003 | loz
I have been advised recently about pcb manufacturers, that somehow or other supply pcb's with contamination. Visually they are fine, but problems arise during SMT manufacture, ie solder balling, non-wetting on pads, and also during wave solder proces
Electronics Forum | Wed Aug 07 11:55:31 EDT 2002 | slthomas
Ron, have a look at http://www.fda.gov/cdrh/dsma/cgmphome.html It would be a nightmare, if your plant is not structured to support it. It's a huge pain in the fanny even when you (alledgedly) are. I'm not sure what you're pursuing, but if you're c
Electronics Forum | Thu Sep 23 08:47:25 EDT 2021 | majdi4
1)Though in many cases the difference between SAC305 and SAC405 was small,and not always statistically significant, it was observed that SAC405 generally outperformed SAC305 joints. Under 0°C to 100°C thermal cycling,no statistically significant
Electronics Forum | Mon Jun 16 14:39:49 EDT 2003 | stepheno
The second one is typical. The important temperature is the temperature of the joint, not the setting of the oven. The oven setting are only important because they determine the temperature of the joint. If you set the oven to 150, that will be th
Electronics Forum | Tue Jun 24 09:42:52 EDT 2003 | stepheno
The temprature for the first zone should be less as the PCB entering the oven from the ambient shop floor temprature would suffer a thermal shock from a higher temp. Experience must be gained from profiling a board with thermocouples, otherwise you
Electronics Forum | Wed Jun 25 12:11:43 EDT 2003 | stepheno
We have a 5 zone oven and were starting at 150 which brought it up too fast. Even with only a 5 zone starting at 140 we get the temp up to soaking temp fast enough. ( I think too fast actually) What kind of oven do you have anyways? And I can't
Electronics Forum | Wed Jun 25 12:20:03 EDT 2003 | russ
This may make it easy, Do you really need soak? Or can you just ramp to reflow. Most pastes that I am aware of perform just as well using the linear ramp as opposed to the ramp/soak /spike. Now, out of curiosity how are you attaching the thermocou
Electronics Forum | Sat Feb 02 08:55:55 EST 2002 | davef
I'd don't believe that the reels need to be ESD protective material. The carrier and cover tape have resistivity and materials specifications. Start with EIA-481. In past threads on SMTnet, we have discussed problems in picking components that wer
