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
Electronics Forum | Thu Feb 03 04:55:21 EST 2005 | Dougs
OK, component wide portion runs with the conveyor, so really both sides should heat and cool at the same rate. The crack is at the termination between end cap and ceramic body and run vertically up the end cap, so when we remove the cap it comes of
Electronics Forum | Thu Dec 12 12:54:25 EST 2013 | jaimebc
For selective soldered components, or even hand soldered, with vertical bend components, the body of the component, in this case a resistor, is making contact with the surface of the PCB, making it impossibe to visually see the solder fillet. Or to d
Electronics Forum | Fri Sep 25 00:54:39 EDT 1998 | Charles Sullivan
Does anyone have process experience with SMT Panasonic Film Caps or SMT Film Caps from others? What advice can you give on special process precautions.....or special handling? Today we found cracking between the body and terminations after reflow..
Electronics Forum | Wed Jul 29 21:16:17 EDT 2020 | SMTA-64387706
Hi, I have a PCB that works fine when tested before conformal coating with HumiSeal 1B73. It seems like the CC is causing electrical issues. We brush it on, so it is a bit thick. After curing we are getting QFNs that do not seem to connect well and a
Electronics Forum | Wed Aug 24 12:37:38 EDT 2011 | hussman
Hello all, We just got some board back from thermal shock and we found that several of the 2512 resistors opened up. Actaully the solder joint cracked away from the board. All other coponents look great. Boards were good before test. 10 layer bo
