Electronics Forum | Sun Aug 15 04:43:15 EDT 2004 | Danish
Can anyone advise how to measure flatness of a surface?Flatness on top of IC..
Electronics Forum | Mon Aug 16 09:17:13 EDT 2004 | russ
For flatness - Put the part on a leveling plate and roll a dial indicator across it. The leveling plate is not required for a true flatness check but using this will also work for parallelism of lead base to top of body.
Electronics Forum | Mon Nov 20 12:03:42 EST 2006 | ferqs
Good morning Ken, Thank you for your feedback. Just as a clarification, SMD stands for Surface Mount Device. Although my end product, in this case, is a SMD, it might be also referenced as a board. In the other hand, what I get from your feedback i
Electronics Forum | Fri Nov 17 14:36:17 EST 2006 | Fer
Good afternoon all, There is an issue in my company regarding flatness on SMDs. The part I am fabricating is a multilayer assembly of .175" by .175" by .049" thick. The part is made out of a multilayer copper clad PTFE with a tin finish surface. Af
Electronics Forum | Mon Nov 20 19:49:03 EST 2006 | davef
Sorry for stating this incorrectly. It should been: Bow & twist for bare boards and panels: IPC-A-610 Acceptability of Electronic Assemblies, 10.6: 1.5% for PTH only and 0.75% for SMT, acording to test method TM-650, method 2.4.22 IPC-6012, par. 3.
Electronics Forum | Thu May 25 21:50:27 EDT 2000 | Dave F
Bill: I'd expect better gasketing on a nice flat solder mask surface rather than the edge of the stencil opening mashed down on a irregular shaped hunk of solder attached to a pad. Stop thinking and get printing Dave F
Electronics Forum | Mon Jun 15 16:51:05 EDT 2020 | emeto
Tin/Lead has 183C melting point and probably around 220 peak temperature at reflow. Tin has 232C melting point. I would assume that based on this information you would understand why intermetallic joint is questionable. Go to any flat finish. HASL wi
Electronics Forum | Wed Oct 30 13:35:45 EDT 2019 | emeto
We prefer Flat finish. We don't like HASL.
Electronics Forum | Thu Jun 27 17:32:35 EDT 2013 | tpost
We recently had a question come up regarding the amount of solder on a flat underside termination ( we referenced Flat Lug Lead in IPC 610). Judging by the photo you can see on the Left is a target solder joint, but on the right is one which had rewo
Electronics Forum | Mon Jul 01 13:38:01 EDT 2013 | emeto
I am also not sure if the Electrolytic capacitor has a "flat lug leads". I think it is more like a coined lead. I hope other experts can advice.
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