Electronics Forum: bridge (Page 1 of 99)

Rainbow bridge

Electronics Forum | Fri Sep 15 05:48:24 EDT 2000 | carsonho

Have any experience that Sn/Pb plated integrated circuit products will appear some rainbowbridge-like substance after exposing at conditions of 121degC, 100%RH and 15psi for 48hours or above? The rainbow bridge substance was analyzed by EDAX and fou

Rainbow bridge

Electronics Forum | Fri Sep 15 05:48:11 EDT 2000 | carsonho

Have any experience that Sn/Pb plated integrated circuit products will appear some rainbowbridge-like substance after exposing at conditions of 121degC, 100%RH and 15psi for 48hours or above? The rainbow bridge substance was analyzed by EDAX and fou

about solder bridge

Electronics Forum | Wed Apr 05 23:56:02 EDT 2000 | angela

Recently we have serious problem of our 0.5mm pitch QFP solder bridge. I check the viscosity of the Litton Kester paster. It's roumd about 700 is it too low. And do you have god solution about it? thanks alot

BGA solder bridge

Electronics Forum | Fri Feb 25 09:30:29 EST 2011 | kahrpr

Was the void on the same pad for the 5 failures or were they random

BGA solder bridge

Electronics Forum | Mon Feb 28 23:07:04 EST 2011 | kemasta

It is random. By the way, this board pass thought wave process, (BGA is at the top), will that cause the older short issue?

Re: about solder bridge

Electronics Forum | Thu Apr 06 00:27:42 EDT 2000 | Dean

I would check their data sheet for the particular product. Thats the range I have for Some Kester products I use... Are you seeing any slumping prior to pick-and-place? Is the bridge in the same place every time? How is your pick-and-place mounting

Re: about solder bridge

Electronics Forum | Thu Apr 06 07:53:35 EDT 2000 | jacob lacourse

I have also come across this very same problem and found that our screen vendor made a mistake on our screen. Check the thickness of your screen it should be about six thousandths if it's eight thousandths then you are most likely depositing to much

Re: about solder bridge

Electronics Forum | Thu Apr 06 08:31:13 EDT 2000 | D Scott

Angela Do you see this problem on other .5mm pitch devices or is it only on the QFP? Check placement height, too low or to high can cause you problems Pad co-planarity, are your boards HASL? Is your board sagging during placement(board supports) An

BGA solder bridge

Electronics Forum | Thu Feb 24 23:11:51 EST 2011 | kemasta

HI I have this BGA short issue, I took x-ray image, the solder ball having big void. We suspect the pad on BGA was oxidie. Reject percentage quite low, only 5 out of 6000. But after the BGA re-ball, is work fine. Anyone have any idea to trobleshoot

Re: about solder bridge

Electronics Forum | Thu Apr 06 02:23:50 EDT 2000 | Marcus

What about your printer and your stencil ? Do you have a problem with misalignment between pcb and stencil ? How often do you clean your stencil during production ? Maybe you have smearing under the stencil because there is a snapoff between stencil

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