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 | Tue Feb 23 09:48:26 EST 2010 | dyoungquist
How are you sepatating your boards out of the panel? If you are flexing them to break the V-score, this could be what is causing the resistors to crack.
Electronics Forum | Tue Feb 23 11:05:46 EST 2010 | kjs123p
We had this same problem several years ago. The caps and resistors were cracking when we snapped the boards apart. We now use a pizza cutter style depanelizer. A couple of manufacturers that I know of are CAB and Fancort. I hope this helps.
Electronics Forum | Tue Aug 30 09:49:24 EDT 2011 | blnorman
Guess the better question is why are the resistors and FETs heating to the degree that they discolored the coating? If the coating is discolored, I'd be concerned with the possibility of cracking as dave mentioned. Cracks defeat the purpose of the
Electronics Forum | Wed Nov 13 02:28:27 EST 2019 | trino
Hello, I am a Japanese engineer. I am sorry for my unskillful English. Have you ever encountered cracks in chip resistors or IC components due to board mechanical stress? Especially, I'm looking for a case in the PCBs Depaneling process(pizza cutte
Electronics Forum | Tue May 26 18:17:22 EDT 1998 | Jerry
Our experience has been that mechanical crack occur vertically through the chip. In other words perpendicular to the board surface. You can sometimes tell through close inspection that the crack may have propogated from a point that the nozzle may
Electronics Forum | Wed Sep 09 21:20:26 EDT 1998 | Simon Ting
hi, 1206 capacitor with silver/palladium termination is mounted onto a ceramics substrates. Bonding is achieved through conductive epoxy. We discovered that the epoxy cracked and this caused missing capacitor. We had tried different grade of epoxy,
Electronics Forum | Thu Sep 10 09:47:15 EDT 1998 | Earl Moon
| hi, | 1206 capacitor with silver/palladium termination is mounted onto a ceramics substrates. Bonding is achieved through conductive epoxy. | We discovered that the epoxy cracked and this caused missing capacitor. We had tried different grade of e
Electronics Forum | Wed Feb 02 08:51:25 EST 2005 | Dougs
we have a capacitor cracking on one of our boards, there are four of the same cap on the board and only one cracks, we are seeing about 6% of the component cracking. it's not near the edges of the board and he board is 2.4mm thick so i dont think it
Electronics Forum | Fri Nov 16 07:47:56 EST 2007 | realchunks
Stress cracks generally happen at wave solder, not reflow. But so you know, stress cracks from heat occur from the body and work towards the leads. They are generally circular. In the past, these cracks where blammed on the nozzle of the placement
