{"id":1912,"date":"2026-09-27T13:21:43","date_gmt":"2026-09-27T13:21:43","guid":{"rendered":"https:\/\/www.diyipcb.com\/hasl-vs-enig-pcb-surface-finish\/"},"modified":"2026-09-27T13:21:43","modified_gmt":"2026-09-27T13:21:43","slug":"hasl-vs-enig-pcb-surface-finish","status":"publish","type":"post","link":"https:\/\/www.diyipcb.com\/es\/hasl-vs-enig-pcb-surface-finish\/","title":{"rendered":"HASL frente a ENIG: c\u00f3mo elegir un acabado superficial para la placa de circuito impreso de tu montaje"},"content":{"rendered":"
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A surface finish is more than the visible color of a PCB pad. It protects exposed copper and provides the surface used during soldering or electrical contact. The useful question is not which finish looks more premium, but which one fits the components, assembly process and intended use.<\/p>\n

Understand the basic difference<\/h2>\n

HASL means hot-air solder leveling: exposed pads receive a solder coating. Leaded and lead-free HASL are different selections, so write the requirement explicitly. ENIG means electroless nickel immersion gold, a finish consisting of nickel with a thin gold layer above it. Selecting a lead-free board finish alone does not establish the compliance of an entire assembled product.<\/p>\n

Consider the component land pattern<\/h2>\n

HASL can leave a less even pad surface than ENIG. Pad flatness can matter when assembling small or fine-pitch components. ENIG is commonly considered where a flatter finish is useful, but that does not make it the correct choice for every board. Review the package and assembler\u2019s recommendations alongside the available fabrication options.<\/p>\n

Separate solder pads from mating contacts<\/h2>\n

A connector contact that will be repeatedly inserted and removed has a different job from a pad that will be soldered once. ENIG is not the same process as electroplated hard gold for wear-resistant edge contacts. If the board has gold fingers or another contact requirement, state that separately instead of assuming a general ENIG selection covers it.<\/p>\n

Compare quotes using an unchanged specification<\/h2>\n

Save the same dimensions, quantity, layer count and copper requirements before comparing finish options. Otherwise, a price difference may come from an unrelated selection. Keep a short decision note such as \u201cflatness requirement to be reviewed for this package,\u201d rather than treating an unreviewed default as an engineering decision.<\/p>\n