Proper PCB pad design is critical for efficiently soldering components to the board. For bare pad assembly, there are two common soldering methods - Soldermask Definition (SMD) and Non-Soldermask Definition (NSMD), each with its own features and advantages. SMD (Solder Mask Defined Pad) is a pad size defined by the soldermask, and the pad size is determined by the green oil process. NSMD (Non-Sold...