Electronics Forum: nsmd (Page 1 of 4)

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

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!

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

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)

Solder mask vs non solder mask defined pads

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

Solder balling under passives

Electronics Forum | Mon Sep 19 21:35:54 EDT 2016 | shriram

Appreciate your suggestion. NSMD pads are used for this design, the anomalies we found are 1. the trace running between pads has a lesser solder mask height compared the other area of the pads. 2. the NSMD pads doesnot have a trench close to pad e

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

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

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

BGA ball vs land design problem??

Electronics Forum | Tue Jun 02 21:27:22 EDT 2009 | davef

We've never heard of a situtation where oversized pads caused voiding. Your supplier is correct that the pads on the board should be the same size as the pads on the interposer, but this is to improve reliability issues. Search the fine SMTnet Archi

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

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

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.

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