Definition

Ultraviolet (UV) processes affect PCB design specifications in several ways. Solder mask specified as UV-cured provides better resolution for fine features (≤100 µm openings) than thermal-cure alternatives. Silkscreen legend ink that is UV-cured gives sharper text on small markings. When reviewing your fabricator's DFM guidelines, note that UV imaging capability determines minimum solder mask dam width and legend character height. UV inspection is used during manufacturing to verify coating coverage and cleanliness.