Electronics Forum | Mon Mar 21 09:33:25 EST 2005 | davef
RoHS Substance||RoHS MCV Limits||Typical Testing Approaches Lead||1000 ppm* ||Wet chemical digestion followed by ICP (Inductively coupled plasma) or AAS (atomic absorption) spectroscopy ||||XRF (X-ray fluorescence) spectroscopy Cadmium||100 ppm ||Wet
Electronics Forum | Wed Mar 16 09:06:07 EST 2005 | russ
This is what I might do, I would purchase either a solder volume (preferred) or at the least a paste height measurement piece of equipmment, The most important parameters with pronting are volume and registration. You need one of these inspection
Electronics Forum | Tue Mar 15 07:59:07 EST 2005 | mattkehoe
We are looking for some feedback on this situation. Please let us know if you have any ideas. Thanks in advance. I have been doing some studies on defects and such with our PCB's in prep for lead free and I've come to a conclusion about our process.
Electronics Forum | Tue Mar 15 09:46:06 EST 2005 | davef
Comments are: * J-STD-001 and A-610 committees have eliminated the requirement that solder joints be "bright and shiny". Certain metallizations (such as gold) can influence the solder joint surface texture, but have no impact of reliability. Reliance
Electronics Forum | Wed Mar 16 09:22:20 EST 2005 | russ
Try varying you conveyor speed as well to increase the dwell time on the wave (touchy, and can easily be overdone). Every no-clean type and process I have ever used will leave some type of residue. They can be minimized but they will always be ther
Electronics Forum | Wed Mar 16 20:11:03 EST 2005 | darby
KT, What sort of delta T are you getting? This does sound a bit odd. TCs are in EXACTLY the same position on each board? Something I only recently found out - according to Mark Cannon from ERSA re profiling, that you may wish to consider. 1.TCs sho
Electronics Forum | Thu Mar 24 07:06:06 EST 2005 | davef
There's a lot of comparison tables on the web. Here's one: Properties - Summary [A Winlow Circatex] Attribute||Hasl||Immersion Silver||Immersion Tin||Electroless Pd||OSP||Eless Ni / Imm Au Shelf Life (months)||12||12||12||12||12||6 Multiple Reflows
Electronics Forum | Thu Mar 17 10:56:24 EST 2005 | jmedernach
Hi John, This problem is interesting. I've never had a problem with solder shorts caused by subjecting a device to reflow a second time. I've built many double sided SMT assemblies with fine pitch devices on top and bottom. Some things to possibly
Electronics Forum | Fri Mar 18 14:21:02 EST 2005 | Dreamsniper
We are producing control products for the Aerospace Industry both Commercial and Military. I have TQFP 100 fine Pitch in one of my PWB's Solder Side and have no misalignment problems or defects on my part after 2nd reflow. I control my reflow profile
Electronics Forum | Fri Mar 18 19:17:37 EST 2005 | valuems
Hello PMD Don't feel like that, we live with these MPM's. And we have over 10 years experience. Also never mess with the down stop on any MPM and you will be better off. Most of mpm's machines have a down stop of .0750 and it should never be cha
