Electronics Forum | Fri Aug 10 13:09:49 EDT 2001 | Hussman
Hey Wister, Assuming you are talking about BGA voids, and you just want to try and optimize your profile, you could try a "straight ramp profie". This is where the soak temp is constantly being elivated until you hit reflow. I find this helped me
Electronics Forum | Wed Nov 21 21:50:50 EST 2001 | Glenn Robertson
Tony, What you are seeing can occasionally be caused by gaps in the plating of the blind vias. If they are not "airtight" you can get moisture coming from the laminate that shows up as voids in the solder balls. You might check on the board sup
Electronics Forum | Tue Jan 21 16:28:02 EST 2003 | tony_sauve
Sorry I didn't close this one off last year... We had some failure analysis done on these PCB's ( 3D x-ray,microsectioning,SEM) and the results definitively proved that there was some contamination @ the base of the uvia's that had the voiding. It ap
Electronics Forum | Thu Oct 10 16:13:01 EDT 2002 | slthomas
"Do you work for Air-Vac or what?" My question as well. If so, it is my opinion that there is a need for some house cleaning, because dissing a competitor's product on this forum is gutter-dweller tactics. If not, can you (AJ, not Russ) provide so
Electronics Forum | Tue Jun 16 18:03:41 EDT 2020 | rsatmech
Thanks for your response. Shorts are happening in different locations(Not same pad repeated) .kindly note these are happening one in 10kThat's the challenge to understand the exact issue. Only one short. Vias - i will check and updated. Yes it's
Electronics Forum | Wed Jun 17 14:29:06 EDT 2020 | emeto
These are great pictures. I have never seen this kind of solder repelling from the pad. My number one suspect now is the PCB. Your focus should be on board plating and contamination. The easiest test is to have meaningful batches from another board h
Electronics Forum | Thu Jun 18 16:15:42 EDT 2020 | rsatmech
Usually board house should inform you of these. Here supplier works differently. We generally don't get these updates. Only the ODM or customers get. We only find when we are facing any issues. Can you please enlight me on how to check the value
Electronics Forum | Wed Jul 08 19:53:04 EDT 2020 | rsatmech
Thanks for your input. I do understand from this thread that OSP is the issue We don't have options left. Need to use this. Defect rate is just 0.002 still I am focusing on zero defect product since this will run for longer period. Kindly provi
Electronics Forum | Wed Feb 13 09:17:47 EST 2008 | scottp
The causes of voids are extremely paste dependent. I did a literature search a couple years ago and the papers all disagreed with each other - one would say turn knob "A" to the right and the next would tell you to turn it to the left. I did my own
Electronics Forum | Wed Oct 03 17:10:32 EDT 2001 | davef
Your component is probably EPTSSOP [Exposed Pad Thin Shrink Small Outline Package]. We had a thread on EPTSSOP a couple of months ago. [Check the fine SMTnet Archives for background.] You�re correct that voids in the solder on the exposed pad [rea
.gif)
