Electronics Forum | Wed Sep 26 11:17:38 EDT 2012 | garym4569
We have been having a solder paste reflow issue which results in the solder not wetting to the LED lead. The solder appears to create "puddles" on the pcb pad. I have attached AOI image for review. We have had the pads analyzed for contamination, w
Electronics Forum | Thu Oct 04 10:54:11 EDT 2012 | eniac
I have only one incredible idea: this is example of different speed of heat transfer of neighboring pads. I saw it two times during last years, but on lead solder pastes (Sn63Pb37). The reason of this mistakes each times we found two: 1. errors duri
Electronics Forum | Wed Dec 05 09:26:08 EST 2012 | proceng1
I've got four KISS 103s. If you keep up with the pump cleaning and especially keep your nozzles clean on the Lead Free, they are great. The only downside with them is that they are West Coast and we are East Coast, so if I have an issue first thing
Electronics Forum | Wed Nov 07 21:36:17 EST 2012 | davef
Multiple process and rework thermal cycles are brutal on boards and components. Improving reliability of products through reducing thermal stress ends-up being a major driver to the interest in lower MP LF solders. Binary LF solders require the addit
Electronics Forum | Thu Nov 15 09:29:29 EST 2012 | anvil1021
Maybe this piece of information will help. In China (just returned from visit) there are many factories that are using a dual temperature process using SAC305 or Sn100C and 42/58. Apparently this allows them to run their through hole parts through re
Electronics Forum | Wed Nov 21 16:53:09 EST 2012 | jmelson
We use an LM2575 switching regulator, and have had no trouble reflow soldering it. It is made for that purpose, so no big tab with the bolt hole, and the leads are pre-bent for SMT. Note that soldering the part to the PCB doesn't really give the he
Electronics Forum | Mon Dec 03 16:05:55 EST 2012 | emeto
Hi all, We are going to evaluate new LEAD-FREE solder paste. We stopped our attention on 3 manufacturers but the variety of products is so big. What would you recommend for a daily basis use? Is SAC305 the most commonly used alloy? We are a subcontr
Electronics Forum | Fri Jan 18 12:34:14 EST 2013 | duchoang
Yes, I have. think I have pretty good reflow profile. We use Lead-Free,No-Clean,SAC305 Solder Paste. The problem is at LGA design.The pad size is alot bigger than BGA. They are totally flat and do not have balls/spheres which melted and collapsed thr
Electronics Forum | Wed Jan 30 17:23:07 EST 2013 | dyoungquist
In response to hegemon... This is not a recommended practice but..... We have added a few drops of water soluble flux to our water soluble solder paste when the paste is on the stencil. This was after the paste had "dried" out a bit. We have had
Electronics Forum | Wed Feb 20 18:04:56 EST 2013 | hegemon
You should have a number of lighting options to deal with the low contrast lettering. Low angle, B/W, reverse color. etc... If I am reading you right, you might have your bridge inspector too far out on the lead banks, that it is seeing the silkscree
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