Electronics Forum | Sat Apr 25 12:58:13 EDT 1998 | Earl Moon
| Is there an industry standard in calculating SMT process | PPM level for benchmarking purpose ? What are the industry | benchmark ppm number for some of the defects like solder | short for 20-mil QFP, tomstone problem for 0603 components etc....
Electronics Forum | Mon Sep 09 21:42:12 EDT 2002 | rwilliams
I have been involved with the reflow process for many years. However, my most recent position now includes the use of Nitrogen. In studying the reflow process and using Nitrogen, it seems to me that it would only make sense to be measuring the O2 lev
Electronics Forum | Mon Jan 04 18:56:25 EST 1999 | Marc P.
| We have a Vitronics SMR400N oven and many times need to use N2 inerting. My problem is that it takes close to an hour of operation to purge the system to achieve the desired O2 levels (~40PPM). This is not only time consuming but results in an inor
Electronics Forum | Wed Oct 29 07:52:42 EDT 2008 | ikonify
Thanks Dave, did send an email to this site as wanted some industy standard PPM levels but my email bounced back. Will give it another go. Thanks for taking the time to reply !!! Steve.
Electronics Forum | Tue Sep 04 13:41:52 EDT 2001 | Brian W.
IPC7912 deals with the end result, ie an OEM getting boards from a contract manufacturer. I have a friend who is sitting on these committees. He tells me there is a new standard due out for actually doing in-process DPMO. From a process standpoint
Electronics Forum | Wed Oct 24 11:57:17 EDT 2001 | mparker
http://www.ceeris.com/DPMO.htm Ceeris is a company that may help you. They collect data and publish benchmark results. Their DPMO report will give you the data you need, for each process step. It's not cheap- they want $3000 per copy. Beyond that,
Electronics Forum | Tue Aug 28 12:05:42 EDT 2001 | mparker
The advantage of DPMO is that the numbers used are PPM, (Part Per Million), rather than percentage. Percentage can distort, depending on volume. For instance, 100 units processed, 25 defects found = 75 percent yield. 4 units processed, 1 defect found
Electronics Forum | Wed Jun 10 18:40:00 EDT 1998 | Earl Moon
| I am looking for the Industry standards on vias. Are they required to be plated with solder or is copper plating enough? What about reliabilty with either one? Also, if tenting the via is required should it be copper plated or solder plated over
Electronics Forum | Tue Dec 21 18:09:24 EST 1999 | Brian W.
I have been soldering 0603 components on the bottom side using a glue and wave solder process for a long time. Bridging has not been a common problem. However, it is inherent on the design engineers to follow good manufacturability planning when la
Electronics Forum | Thu Dec 16 11:54:45 EST 1999 | Mike Naddra
At reflow an inert atmosphere is used to mitigate the occurance of oxidation, to me the decision weather to move from an inert atmosphere is based on several things ; PCB surface finish - are you using a HASL finish, OSP or another surface finish and
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