Electronics Forum: dull and board and pads (Page 1 of 11)

PCBA board and probe

Electronics Forum | Wed Nov 17 20:11:29 EST 2021 | dwl

is there flux on the board? are you probing a test point or a soldered pad? is the probe hitting the right spot?

SOT-223 Flux trapped under part and lifting off pads

Electronics Forum | Thu Sep 30 11:30:46 EDT 2010 | babe7362000

Take a few parts from the reel and look close at > the parts to make sure the bottom surface of the > leads is below the bottom surface of the body. Yes I did that and they are below the body. I found the problem I think. The solder mask is abo

SOT-223 Flux trapped under part and lifting off pads

Electronics Forum | Wed Sep 29 08:26:03 EDT 2010 | babe7362000

We are Currently running a Board and it seems that the SOT-223's on the bottom side have flux and water trapped under the part. Nothing has changed in our process and this is the only board that it is happening on. We are using Kester R562 water wa

How important NSMD pads are for the QFN and similar packages?

Electronics Forum | Wed Aug 27 15:50:11 EDT 2014 | smtdoug

If at all possible, you definately want solder mask defined pads. Without it, you will struggle with solder bridging. This is especially important if you have a larger size board.

How important NSMD pads are for the QFN and similar packages?

Electronics Forum | Thu Jul 31 09:30:01 EDT 2014 | emeto

I know that some board houses have better capability than others. Some can do down to 4mils mask in between the leads I think. I know that it also depends on the type of the mask they are using - for some types you can't go down to the 4mil. Regards,

How important NSMD pads are for the QFN and similar packages?

Electronics Forum | Thu Jul 31 10:14:27 EDT 2014 | matusov

I know that some board houses have better > capability than others. Some can do down to 4mils > mask in between the leads I think. I know that it > also depends on the type of the mask they are > using - for some types you can't go down to the >

How important NSMD pads are for the QFN and similar packages?

Electronics Forum | Wed Jul 30 00:47:10 EDT 2014 | matusov

Hello gurus, I am a hardware designer with a small company. We are about to send a new PCB for fabrication. This board uses dozens of tiny QFN, DFN, and similar packages. As a final check I have been going through the datasheets of all these parts t

Dye and Pry

Electronics Forum | Wed Mar 12 10:26:10 EDT 2008 | realchunks

Why would a board failure related problem be a process problem. I agree most companies believe EVERY problem is a Proces Problem, but in the real world we know this is not true. A pad lifting means your solder joint was able to rip it off the boa

Dye and Pry

Electronics Forum | Wed Mar 12 23:00:10 EDT 2008 | davef

You can say: The pad was lifted after reflow and prior to the dye and pry failure analysis. When we see lifted pads, we think: * That's a good solder connection * Either it took a lot of force to lift that pad or the fabrication of the board in the

Skewed and popped components

Electronics Forum | Tue Sep 23 23:19:34 EDT 2003 | RLW

If you have a board that you've run several times, now you run it and like before all settings are the same, but now you have 0603's randomly skewed or an inch or so away from their intended pad (as if popped up in the air), or an occasional 7343 cap

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