Electronics Forum | Thu Sep 24 09:28:13 EDT 2015 | rgduval
No direct experience with this particular issue....but, I do know that measuring capacitance can be tricky. How are you arriving at this conclusion? Are you measuring the caps on the bench before assembly, and then on the boards post assembly? Cap
Electronics Forum | Sat Feb 05 13:25:32 EST 2005 | etienne
Just a basic suggestion.... Inspect the nozzle placing the component...because that is the only medium, apart from the PCB design, which can be causing the damage. It occurred in my Department.
Electronics Forum | Wed Jun 23 08:47:32 EDT 2010 | mun4o
Hi, about location - components are in the diferent location on PCB.In the one PCB have 7 cap 560pF 0603 , and some of thenm are cracked, another are OK. When I look at 20x microscope , I can't see defect, but ICT measure from 200 to 350pf.When hea
Electronics Forum | Wed Feb 02 20:00:48 EST 2005 | davef
150*C/min * Determining the distance it takes to lower the delta temperature at the current conveyor speed: [150*C/min]/[25 inch/min] = 6*C/inch * Calculating how much of this 6*C/inch would be spread along the length of the 0805 capacitor: [6*C/inch
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 May 14 08:31:07 EDT 2004 | todd_ferrell
We're looking for a contractor who can support high volume production of 0201 passives and 1-2mm csp's to create 4mm sq. RF modules as well as mold cap capabilities. Any leads would appreciated.
Electronics Forum | Wed Nov 26 19:10:05 EST 2014 | caurbach
While I can't directly answer your question, we've had the same problem here occasionally. Our wash parameters are roughly the same as yours. It seems to be correlated to the diameter of the cap (larger caps will balloon while most smaller caps are
Electronics Forum | Mon Sep 10 11:16:37 EDT 2007 | russ
Can you implement a longer soak? how many feet of heat do you have in oven? Russ
Electronics Forum | Thu Jun 19 15:07:23 EDT 2008 | realchunks
Sure! But they warm up slower than everything else, so it's not a big deal. You can taylor your profile around them and never exceed your 50 second threshold.
Electronics Forum | Mon Nov 07 11:26:23 EST 2005 | CW
How large of chip capacitor can we use reliably? I��ve heard they tend to crack. I��ve also heard if you pre heat the larger chip caps (1812 and above) before vapor phase reflow, they won��t crack. If I use 2 mil copper for a power supply board, a