Electronics Forum | Mon Jun 18 11:34:00 EDT 2001 | Gil Zweig
As you probably have discovered, the cost of x-ray inspection systems can run anywhere from $35,000 to $350,000 or more depending on if you want an In-line or off-line system. Assuming ,in your facility, you want an off line system, then the next con
Electronics Forum | Wed Jun 20 12:07:13 EDT 2001 | Steve
I would suggest getting a copy of IPC-SM-782A, Surface Mount Design and Land Pattern Standard, and IPC-7525 Stencil Design Guidelines. My experience is that reflow does not cause tombstoning very often. Pad and land design, paste volume, and placemen
Electronics Forum | Sat Jun 23 12:42:20 EDT 2001 | genny
OK, to reopen this and muddy the water a little more, What is the difference between REL0 and ROL0 solder. The solder paste that more than one of our suppliers is using is AIM293+ - this is REL0 The no-clean solder wire we use in house is ROL0, mad
Electronics Forum | Mon Jun 25 20:35:44 EDT 2001 | davef
According to J-STD-004 "Requirements for Soldering Fluxes", fluxes are classified by their chemical composition, activity level and halide content. In this scheme, each flux type is identified by a 4-character designator, where: * First two character
Electronics Forum | Wed Jun 27 10:17:46 EDT 2001 | genny
OK....I now fully understand the difference in chemical makeup between rosin and resin. But....can you, or would you, mix them without any concern? Could you or someone please just give me a straight yes or no answer? Please? Of course,... I woul
Electronics Forum | Mon Jun 18 19:57:40 EDT 2001 | Gil Zweig
Dave: You pose a very good question. We have been in the electronics x-ray inspection business for 18-1/2 years and, to date, we have not received a single report of damage associated with x-ray exposure. However... we do see signs of long term x-ra
Electronics Forum | Mon Jun 18 18:14:59 EDT 2001 | davef
Would comment extensively on the following? The time is a fact for X-ray inspection. If you set the contrast, tilting angle correctly (provide you did enough cross section to know the few type of failure mode: e.g. smaller balls, shorts, missing on
Electronics Forum | Tue Jun 19 12:15:45 EDT 2001 | Gil Zweig
I have made reference to X-ray Ball Bond Signatures a number of times, and I cannot overstate the importance of quickly qualifying the overall ball bond pattern as either uniform in size and shape or not. Software is available that will make this qua
Electronics Forum | Tue Jun 19 11:57:35 EDT 2001 | Gil Zweig
As you probably know, x-ray inspection has problems positivly identifying cracks or delamination. This task is more suited to scanning laser acoustical microscopy but the cost is very high. It has been our experience that cracks are associated with t
Electronics Forum | Tue Jun 19 10:59:21 EDT 2001 | Gil Zweig
When x-ray inspecting BGA packages with metal heat spreaders tube voltages greater than those used for Plastic BGAs must be used. It must be recognized, however, that the tube votage required will depend on the particular sensitivity of the x-ray cam
