Electronics Forum | Fri Jan 22 16:03:17 EST 2021 | SMTA-64387124
Does anyone see any issues in mixing SMD and NSMD pads within one BGA footprint. We have high current pads which we want to make SMD and the other signal pads to be NSMD
Electronics Forum | Wed Jul 30 11:55:09 EDT 2014 | matusov
I would consider to have mask in between the leads and have it open a little bit more than the copper Thank you. That is exactly what the NSMD pad is!
Electronics Forum | Wed Jul 30 11:41:06 EDT 2014 | emeto
example
Electronics Forum | Wed Jul 30 12:25:38 EDT 2014 | emeto
Yes, but I have seen designs where the whole row of leads has no mask(which is also a NSMD)
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
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.
Electronics Forum | Wed Jul 30 11:36:31 EDT 2014 | emeto
About the pads shape - you can do rectangular or oblong. For stencil design oblong is better for small pads(0.2mm) because it will give better release, so having this thought in mind you should probably design oblong shape and then print make paste a
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,
Electronics Forum | Wed Jul 30 23:40:45 EDT 2014 | matusov
Yes, but I have seen designs where the whole row > of leads has no mask(which is also a NSMD) Apparently I might have to do just that for some parts. We have a few parts with 0.2 mm pads at 0.35 mm pitch. Our PCB shop says that they need at least
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 >
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