Do you know what are the SMD (Solder Mask Defined) and NSMD (Non-Solder Mask Defined) land pattern pads? Any difference between SMD and NSMD pads? What are the advantages and disadvantages for them? What are the design recommendations for them?
Many people in the electronics industry may have heard of “SMD (Surface Mount Device)” of electronic components” and “SMT (Surface Mount Technology)” of soldering technology, but may not know what NSMD is. In fact, SMD and NSMD referred to here are the exposed copper pads or land pattern layout design seen on the PCB. This kind of small detail in PCB pad design was not even noticed by anyone in the past, but has become increasingly important due to the trend of electronic components becoming smaller. Because it affects the quality of solder and the strength of soldering.