Electronics Forum | Fri Nov 12 08:55:43 EST 1999 | Wolfgang Busko
Hallo Edmund, what does dull mean in your case ? It�s nearly impossible to say something about it without more information. Dull or shiny isn�t a clear or better no indicator for good or bad. Some companies add other metalls to the solder to get rid
Electronics Forum | Thu Sep 16 18:07:16 EDT 1999 | Earl Moon
| We have some SMT components with gold plated leads. They're actually LCC led packages. A good solder alloy to use would be Indium / Lead to reduce tin dissolution into the gold and avoid the resultant brittle intermetallic compound. However, a reco
Electronics Forum | Tue Jun 08 17:31:15 EDT 2010 | whitewing
For protos and very short runs I already use a polyester stencil + pizza oven process which is fine except for the placement time and tedium. I'm partly trying to bridge the gap between that and stuff that needs subbing out due to quantity, and partl
Electronics Forum | Wed Aug 03 16:41:22 EDT 2011 | jlawson
SJ Innotech from (Korea), make excellent printers, have some excellent features, other do not have, great bang for buck, well built. Have machine with FULL 3D SPI built in, first machine maker to offer this on market. Also offer long PCB models for
Electronics Forum | Tue Sep 30 13:41:51 EDT 2014 | cyber_wolf
In 25 years of profiling, I have never seen a reflow profile make TOMBSTONES better. I have had "experts" come in an adjust our ovens to the "magic profile." The AOI data has never shown improvement from profile changes. EVER...EVER. As long as you
Electronics Forum | Wed Dec 04 12:42:04 EST 2019 | dunks
We currently use Kester's ep256 as well and it seems to be a bit more grainy than one would expect from lead, especially if the temperature is too low. That paste says it's specialty is being robust over a wide range of profiles and stencil conditio
Electronics Forum | Wed Aug 03 20:28:10 EDT 2022 | cbeneat
We have been known to bring the break air to, and past .1 on the gauge. You have to be careful, as you increase the break air It can blow small parts that are close to any light, or send a part that it is trying to mount. So we always increase increm
Electronics Forum | Fri Mar 17 21:38:55 EDT 2017 | jlawson
I think the main driver is MTBF data driven by the Car OEMS, mainly german makers pushing this onto suppliers in supply chain. Vacuum soldering and void reduction is a hot topic for the leading electronics suppliers in Germany at the moment. Is not r
Electronics Forum | Thu Apr 01 16:47:23 EST 1999 | AlexO
Dan, The rationale to use laser cut stencils in my experience is based on the benefits to paste release. Laser cut stencils are "supposed" to have a smoother inner aperture wall. That, combined with the trapezoidal shape (which can be emulated with
Electronics Forum | Wed Mar 15 08:18:29 EDT 2017 | rob
It's well documented in higher power semiconductors where thermal interface materials are used, such as SIL pads, thermal grease etc. There are a couple of papers on the effects of voiding on MOSFET performance, but I haven't got around to reading