Electronics Forum | Thu Jan 27 20:34:12 EST 2000 | Dave F
Ashok: The real concern about moisture sensitivity is in plastic packaged parts. The plastic packaging used to manufacture surface mount technology devices absorb moisture from the environment. The high temperatures involved in vapor phase/reflow
Electronics Forum | Wed Jan 05 11:11:09 EST 2000 | Dave F
Hey Pat: My responses are: 1. Does anyone have experience with the shelf life on immersion white tin? If so, how long can the boards be stored without adversely affecting solderability. I've heard one year. No, we don�t, because we turn boards fa
Electronics Forum | Tue Oct 26 18:03:05 EDT 1999 | Dave F
Sai: I can't amswer your questions, but I can give you some leads to people that may be able to help you. Below is a list of companies that deal used equipment. Some refurbish equipment, others turn the equipment from seller to buyer. Good luck.
Electronics Forum | Fri Oct 01 09:03:25 EDT 1999 | Dave F
| | | We are all faced with increasing interconnect density in all we do. This means smaller everything, especially components and that which they are mounted upon but, hopefully, without smaller minds and thoughts. It all demands more process contro
Electronics Forum | Thu Sep 09 09:33:22 EDT 1999 | Dave F
| Hello everyone, | Anybody know how to prevent EOS problem? | Recently, we sent some defective IC components to original suppliers for further analysis, but the result is those parts were all damaged by EOS! | Please somebody help us to prevent thi
Electronics Forum | Thu Aug 19 14:06:07 EDT 1999 | Stu Leech
| | | | We have developed a new process for removing moisture from surface mount devices. We have one site where PCB laminate drying has been reduced to 1.5 hours. A standard oven took 4 hours to do the job. I am looking for a firm who does large sca
Electronics Forum | Thu Aug 19 14:52:13 EDT 1999 | John Thorup
| | | | | We have developed a new process for removing moisture from surface mount devices. We have one site where PCB laminate drying has been reduced to 1.5 hours. A standard oven took 4 hours to do the job. I am looking for a firm who does large s
Electronics Forum | Wed Aug 18 21:03:41 EDT 1999 | Dave F
| | | | | One of the DFM suggestions I've seen is to remove the solder mask web, i.e. the mask between pads on 20-mil QFP devices. The rational is that if the mask is thicker than the pad the mask can prevent the stencil from making intimate contact
Electronics Forum | Fri Jul 30 20:11:35 EDT 1999 | Mike Konrad
It is true that the use of saponifiers (and other water soluble additives) will lower the surface tension and aid in under component penetration. It is also true, however, that other specific design features within a batch machine can also aid in un
Electronics Forum | Tue Aug 03 17:28:33 EDT 1999 | DLKearns
| | | I have been asked to supply a maximum shelf life for our assemblied PCB's. I realise this is dependent on so many factors- temperature, humidity, no of layers etc. But does anyone have a formulae for calculating shelf life, or does anyone know
