Electronics Forum | Mon Nov 12 09:22:41 EST 2007 | devajj
BTW, The surrounded QFN fine pitch terminals > should have the normal aperture reduction of 7 % > in case of RoHS Senju solder paste. This works > for our Telecom customer. > > The vias in the > ground pad will be somewhat filled with solder >
Electronics Forum | Mon Nov 19 09:34:50 EST 2007 | bbarton
Real Chunks...Yes, that's the most glaringly obvious defect in the short term (you'll probably find it on your production floor if it's really bad) but you may find that everything looks good short term only to have a high level of customer returns..
Electronics Forum | Tue Dec 04 09:46:50 EST 2007 | pms
Thanks for all your suggestions. I like the BGA replacement pad option the best. Reprogramming/programing? Forget it. That's what I'm trying to avoid. I'd be there all friggin day long, with all the loser "Labor Only" accounts we have. And oh, the p
Electronics Forum | Fri Dec 21 09:24:33 EST 2007 | rgduval
Andy, I think you'll find as many answers to your questions as you have people that post them. To that end, here are mine: Planning to pay off the machine...we took it as an overhead cost, and didn't directly correlate cost of the machine to job co
Electronics Forum | Tue Dec 18 09:31:45 EST 2007 | rgduval
Bill, Any reflow oven sales guy would be happy to help you with a snazzy sales pitch. I also had some info from paste manufacturers when I pitched it to my boss. Essentially, I believe, it comes down to control. You may be able to get a 4-zone ho
Electronics Forum | Fri Jan 04 09:44:59 EST 2008 | philkaz
Hello, I am Philip Kazmierowicz and I work with KIC, a Thermal Profiling company. We have done many lifetime experiments on Printed Circuit Boards over the years. The key thing to understand is that if the primary material of the board in FR4 fiber
Electronics Forum | Fri Jan 04 09:01:35 EST 2008 | davef
Here's a link to the article that Loco references in the above post: http://www.smtnet.com/library/files/upload/DevelopingaReliable.pdf The table seems to be taking a simplistic approach. J-STD-020C, Table 4-2 lists nine catagories of MSL classific
Electronics Forum | Mon Jan 07 09:25:55 EST 2008 | pjc
One per operator is the optimum for obvious. 3 to 4 per operator is more typical. The number is not as important as the type and time. Like don't have someone handle 2 different TO92 part nrs., splitting them up to different operators eliminates the
Electronics Forum | Wed Jan 09 14:46:29 EST 2008 | chef
Besides changing fluxes, do you have good knowledge of actual flux volumes? Do you have a micrograms per square value? Pre-heats can affect flux by burning off too soon and also not enough - therefore moisture hits the wave- how's your humidity cont
Electronics Forum | Tue Jan 15 09:20:26 EST 2008 | rgduval
I just got a scope off of Ebay from Precision World. There have been some kinks, but, overall, it was a good experience. The scope I picked up actually zoomed a little too much for our needs (I need to use it for assembly, as well as inspection).
.gif)
