Electronics Forum | Wed Mar 04 11:47:42 EST 2009 | patrickbruneel
I have to correct something from my previous post (before someone else corrects me). You can grow dendrites from any conductive surface (Cu, Ni etc.) but the final stage would be lower SIR. In my experience other metals except for tin do not lead to
Electronics Forum | Wed Apr 08 15:07:10 EDT 2009 | waveroom
When or before evaluating your paste you might want to find out how Readily available it is? From where it is coming to you? (Freight charges).. And how reliable the distributor is that is selling it to you. Nothing worse than running out of paste an
Electronics Forum | Fri Apr 17 09:39:07 EDT 2009 | rkevin
I received my sample jar of NC257-2 SAC305 from Aim, and while that may have been true about older Aim paste formulations, this stuff prints and reflows better than anything I have tried and more importantly there were practically no voids on a 256 B
Electronics Forum | Wed Apr 29 08:32:08 EDT 2009 | davef
We'd expect the contract assembly houses in your area could do that soldering for you. Ooops, you said 'customer' that means you're a contract assembly house and don't want to give business to your competitor or give them a lead on your customer. Me
Electronics Forum | Thu Apr 30 12:59:16 EDT 2009 | realchunks
I have run design of experiments on screen printers and most times people forget about the type of board you are running; the condition of the board; manufacturer of the paste as I have seen Type 4 no-clean no-lead pastes react very differently using
Electronics Forum | Fri May 22 08:04:30 EDT 2009 | stevezeva
Have any of you ever worked with Actel's QFN 180? A three row I/O QFN? Actel has a published paper on design and assembly guidelines, but we're finding that they are pretty much generic, and don't really work as well as they lead you to believe. ht
Electronics Forum | Sat Jun 06 15:14:35 EDT 2009 | ysutariya
If the concern is the increased moisture absorption associated with lead-free capable materials, you probably have the most experience with phenolic materials like Isola IS410 or 370HR. The best move would be to switch to an IPC 4101/99 or /124 mate
Electronics Forum | Thu Jun 04 14:35:11 EDT 2009 | floydf
We wound up using a ramp to spike profile with 50 sec. between 150C and 217C and 90 sec. above 217C. The idea being the flux is still active when it hits reflow, and it stays in reflow long enough for the weird alloy in the parts lead to wet. All par
Electronics Forum | Mon Jun 29 10:19:25 EDT 2009 | brandieatborisch
Are there any photos available of what good HASL finish looks like as opposed to not desired? I'm looking for something to use as an aide in inspection becasue sometimes boards at our facility are received with HASL where the solder is excessive cau
Electronics Forum | Fri Aug 28 06:39:29 EDT 2009 | sachu_70
I had seen such effect caused by the wave itself, where the exposed wave surface was coated by a thin dull oxide layer which then adhered to the bottom side of PCB during wave soldering. You could verify if the wave surface is clean metal when the P
