Electronics Forum | Wed Apr 28 20:57:22 EDT 2021 | stephendo
It will be tough to get a good line for that cost. You might want to start by looking at Mydata and Juki for the machines. Ekra for the screen printer and Heller for the oven is where you might want to start. If you have not already you might want
Electronics Forum | Tue Aug 31 19:16:59 EDT 1999 | Steve Surtees
| I am looking for a rule of thumb regarding the maximum ramp standard components (chip capacitors) can tolerate without failure during the reflow process. The standard seems to be 3C\second, but this figure is generally derived from the average ram
Electronics Forum | Thu Jun 13 08:32:24 EDT 2013 | rway
Have you verified the measurements on the bench with an LCR meter? Chances are you are experiencing aging with these ceramic caps. We have similar issues with X5R and X7R caps. You will see the effects of aging with returns from the field as well
Electronics Forum | Thu Jun 28 12:44:11 EDT 2018 | dleeper
A few questions: How did you put the wrong part on for so many years and not catch it? Was this due to an error in the customer supplied data like an incorrect BoM or an internal error such as a P&P machine programming error? How wrong was the wron
Electronics Forum | Tue Jan 02 02:30:18 EST 2007 | _____
Ahh yes, 254. Don't give up on the other vision types. 254 can give you skewing as well. Your width and height are awfull close. Even with the 0.5 tolerance it is using the tolerance and saying that it is OKAY. Maybe what you measure is 1.8mm for wit
Electronics Forum | Fri Jul 09 19:09:52 EDT 2010 | rway
A couple of things: Does the cap break if you try to remove it with hot air? If not, than you are breaking the caps do to mechanical stress. We have had similar issues. I don't think your board is suffering from mechanical stress from depaneling o
Electronics Forum | Fri Apr 18 16:53:25 EDT 2003 | takfire
DST, What was the crack signature? Was the crack parallel with the internal electrodes or 45� with the terminal electrode? It is also important to determine the orientation of the failed caps on the PCB (in regards to depaneling). Perhaps the cap
Electronics Forum | Tue May 21 17:22:45 EDT 2019 | stephendo
There are flex caps that are more tolerant of flexing. I don't think they are a lot more expensive. You might want to try a run with them?
Electronics Forum | Fri Jun 14 13:43:02 EDT 2013 | rway
The low value will be 0.624uF. You have to factor it from the low tolerance (-10%). So: 0.9 x 0.92 (machine tolerance) x 0.91 x 0.91 x 0.91 (3 decade aging factor for X7R dielectric). We factor hours at the 3rd decade (10,000 hours), but you can
Electronics Forum | Wed Sep 28 01:32:15 EDT 2005 | Mika
Try vision type 12 for capacitors, this will give you much better acceptance in the vision inspection, since those are slightly rounded. Resistors works normally fine with vision type 10. If you have a component that is very hard to get pass the visi
