Electronics Forum | Wed May 22 19:10:47 EDT 2013 | anvil1021
We do a lot of these devices and I guess I am not familiar the term "Dry Solder". The QFN device is not designed to have a drain hole, but needs to have thermal vias to control heat in most cases. We have used every possible gnd pad design and modifi
Electronics Forum | Wed Jul 03 15:40:17 EDT 2013 | davef
Shear tests are [in my opinion] senseless. The shear stress you measure depends more on the shear rate and on the point where the force is applied than on the grain structure. When shearing a component, you not only apply shear stress, but also roll
Electronics Forum | Mon Oct 14 19:59:17 EDT 2013 | hegemon
We do in fact see a reduction in soldering defects, most especially wetting issues for both parts and PWBs, tombstones, billboards, etc... As a CM we see all kinds of customer furnished material, some of it not in the greatest condition. Our best p
Electronics Forum | Tue Dec 24 09:34:55 EST 2013 | emeto
Hi, it is a not given clear here. I will tell you some basics about the profiling: 1. Profile stages A. Preheat - the board preheats from room temp to 130-150C depending on the paste B. Soak - 150-170(or other range depending on the paste). here th
Electronics Forum | Mon Sep 29 16:38:07 EDT 2014 | rgduval
These papers are a good place to start when learning about profiling: https://www.smtnet.com/library/files/upload/374_RSS_vs_RTS_revised_12-99_(no_pics).doc http://www.ipcoutlook.org/pdf/best_practices_reflow_profiling.pdf If you're having a lot o
Electronics Forum | Tue Mar 08 15:35:43 EST 2016 | fuji_user_2014
I am having problems with LGA solder balls under the devices. Here are some of the details: 1. There are only 2 affected parts @4 locations. 2. The parts are LTM4616EV#PBF and LTM4608AEV#PBF. 3. We are using a ramp soak spike profile. 0-100secs=r
Electronics Forum | Wed Mar 28 16:19:41 EDT 2018 | dleeper
Quad didn't go out of business because they made stellar machines, but if you are running the same board all day long, you can get it dialed in where it's repeatable and reliable. Spares aren't expensive (at least by comparison)and there are lots of
Electronics Forum | Wed Jun 12 04:02:00 EDT 2019 | liyunqiong
SMT reflow soldering temperature setting and process flow: The influence of SMT reflow process parameters on the key parameters of reflow soldering temperature curve provides reference for the setting and adjustment of reflow soldering process para
Electronics Forum | Tue Jun 25 12:10:10 EDT 2019 | slthomas
The profile (temperature curve) is absolutely a function of both top and bottom zone settings as well as conveyor speed, blower speed, etc.. Certainly when you perform profiling you have to consider both top and bottom heaters when you make adjust
Electronics Forum | Fri Oct 11 03:56:39 EDT 2019 | chrislandafont
Hi Tsvetan, Yes, I've heard it's difficult to program but good once it gets going. At the moment, I'm working through the manuals, but can't find a step by step guide, just lots of reference material on how to do things, but not knowing what orde
