Electronics Forum | Sun Oct 24 20:55:45 EDT 2004 | christina
Dear Chris Thank you so much for the prompt reply and it really helps. Do you have any SMT experience for rig-flex boards? Can you share with me about the differences with that of rigid boards? Is there any special precaution needed? When you were d
Electronics Forum | Fri Oct 22 04:09:22 EDT 2004 | christina
Is there anyone who knows the yield rate difference for SMT on multi-flex boards and rig-flex boards ? Basically, I think the yield rate should be higher for rig-flex than multi-flex due to the poor dimensional stability of polyimide, since multi-fle
Electronics Forum | Wed Jan 09 17:03:44 EST 2002 | rob_thomas
We follow IPC-2221 recommendations for Au and don't have a problem as long as the Ni is under 150 microinches.This ensures a consistent process for us.Also we do plasma clean after SMt and prior to wirebond.That makes a big difference. Rob
Electronics Forum | Fri Oct 22 11:53:53 EDT 2004 | C Lampron
Hi Christina, What would you be basing the yields off of? Is it solder defect, component placement, etc....? I have worked for a flex house for quite a few years. You are right. The Polyimide is very dimentionally unstable. (even more so on humid da
Electronics Forum | Thu Feb 25 13:17:21 EST 1999 | SMT-ASSY
Look up on the SMTnet directory for Training. Type in the search box "training" and then click on the search button. This should give you a list of all service provider which include training as part of their service to the industry. I am sure that
Electronics Forum | Tue Jun 30 16:26:50 EDT 1998 | Ben Salisbury
I use both companies, and happen to hit witch ever one can get me the cheapest price. As far as customer service, both are incredible. As far as services, each has it's strong points over the other. Give both a call and decide for your self... which
Electronics Forum | Thu Feb 25 12:51:10 EST 1999 | SMT-ASSY
You can look up on the SMTnet directory for Training. Type in the search box "training" and then click on the search button. This should give you a list of all service provider which include training as part of their service to the industry. I am su
Electronics Forum | Fri Mar 06 10:46:35 EST 2009 | davef
First, we agree with Loco that your QFP is nonwetting, rather than dewetting. Your sceen-shots look like ol' timey SnPb paste recipes. Turn-up the heaterometer dial. Second, on nitrogen: * We kinda think your O2 needs to be around 100ppm with 99.99%
Electronics Forum | Wed Jan 09 15:24:49 EST 2002 | mregalia
Thanks Chris. As I was writing my last message our mailperson dropped off the latest issue of Circuit Assembly. It has an article on mixing SMT and COB on the same board. The author recommends as a compromise 10-20 micro inches of gold over 70-100 of
Electronics Forum | Thu Oct 04 16:07:03 EDT 2007 | jdengler
Everything for a lead free job is labeled with green lead free labels. This includes all processing documentation. When the kit is issued to production the production supervisor and SMT lead operator are reminded that the job is lead free. When th
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