Electronics Forum | Tue Apr 17 10:22:16 EDT 2001 | tom g
Has anyone out there had solder joint wetting issues with Murata ceramic chip caps, in particular with Alpha UP78 no-clean paste? We are finding that changing either the paste or the vendor corrects this problem. If so, please advise your solution(
Electronics Forum | Tue Apr 17 21:19:31 EDT 2001 | davef
Curious. Tell us more about: * Murata solderability protection * Solderability protection on the caps used to replace the Muratas * Reflow profile used with each of the two pastes * Differences in the two pastes
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 | 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 | Thu Feb 03 12:21:15 EST 2005 | Chunks
Lets get to the simple things. Wave or Reflow? Wave soldered parts have a higher susceptibility to physical damage until they are waved. That�s were I normally see this type of break. Usually, the crack is a circular pattern in the cap if it�s fr
Electronics Forum | Wed Sep 23 07:51:28 EDT 2015 | kkay
We have been experiencing an issue where our Panasonic film caps on a board are losing their rated capacitance. We are well within their recommended reflow specs and no other operation exposes the part to a temp of more than 160°C. The caps will read
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 | Mon Nov 07 12:25:32 EST 2005 | Rob
Hi CW, Larger chip caps can be susceptable to cracking, but mainly this is due to handling - flexing of boards is the main culprit (the part being mechanically joined at both ends to the board). PCB's usually flex easiest along one axis, and larger
