Electronics Forum | Wed Mar 26 17:09:52 EST 2003 | Jos�
For the Resistor Network Array SMT 0402- 8 pads I'm using a Stencil 5 mils Th. with the next appertures : Corners-biggers pads: 24 x 12 mils Center pads : 9 x 24 mils This Appertures are working excelent for the RN's that his appertures are parallel
Electronics Forum | Fri Apr 11 16:07:08 EDT 2003 | daanterstegge
I'd say your profile is about right, assuming these are values that you measured in the balls of this BGA and not elsewhere on the board. If you want a more shiny joint than use a nitrogen oven or experiment with various solder pastes, but why the he
Electronics Forum | Mon Apr 14 10:20:05 EDT 2003 | davef
Daan Terstegge, on his excellent site [ http://www.smtinfo.net ], makes several free DFM checklists available for download. Earl Moon contributed couple of them. Moonie has been a generous contributor to the SMTnet Forum and wrote several knowledge
Electronics Forum | Tue Jun 17 08:52:39 EDT 2003 | russ
Aspect ratio = width of aperture divided by height. E.G. 6 mil stencil at 9 mil wide = aspect ratio of 1.5. Value should be 1.5 min. Area ratio - use when length and width of pad are roughly same dimension like for BGAs and 0805 and smaller R-nets
Electronics Forum | Thu Sep 11 23:50:51 EDT 2003 | Dean
Epoxy is hydroscopic. A cavity will form when the cure furnace reaches the boiling point of water. The steam expansion creates the pocket. It can be large enough to be filled with molten solder from the wave machine and cause a hard short under th
Electronics Forum | Wed Sep 17 03:15:40 EDT 2003 | Daan Terstegge
Are there via's underneath the Tantalum, closed with soldermask on the other boardside only ? I've had a situation recently where a chip resistor was blown away by the outgassing of via's under a Tantalum. The presence of the Tantalum caused the vap
Electronics Forum | Tue Oct 14 23:40:36 EDT 2003 | Dean
Here is a tip. Do an evaluation on materials. DO not trust what anyone says about solder paste. There are just too may "experts" out there peddling the brand of the week. You can begin with the brands listed, but do your homework. You know your
Electronics Forum | Sun Dec 14 23:41:15 EST 2003 | valuems
In response to your inquiry, Value Machine Sales is an established company of over 5 years, having over a total of 22 years of experience in field service engineering and specializing in MPM machines. VMS offers tech support, spare parts and warrant
Electronics Forum | Fri Mar 05 15:02:18 EST 2004 | magdelectronics
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Electronics Forum | Fri Apr 02 09:41:45 EST 2004 | mattkehoe
We are in the process of purchasing a mole for our reflow oven. We've only looked at one model and it works well however, my accountablilty partners desire that we look at other options before we make the decision. Looking at about 3k. Opinions from
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