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Surface Finish Guide

HASL vs ENIG Surface Finish Comparison

Surface finish protects exposed copper and affects solderability, assembly quality, shelf life and PCB assembly result.

Contact EngineeringSurface Finish Options

Original technical explanation

HASL lead-free coats PCB pads with solder and is widely used for many standard boards. ENIG uses nickel and gold layers to create a flatter surface, which is often helpful for fine-pitch components, dense assembly and longer storage expectations.

Selection considerations

  • Use HASL lead-free for many standard FR4 PCB and straightforward projects.
  • Review ENIG for fine-pitch components, flat pad requirements and shelf-life concerns.
  • Confirm finish early because it affects inquiry, process planning and assembly compatibility.
FactorHASL lead-freeENIG
Pad flatnessLess flatFlatter surface
Process fitGeneral-purpose applicationsFine-pitch and storage-sensitive applications
Fine pitchReview carefullyOften preferred
Typical useStandard boards, LED, power, controlsIoT, medical, wearable, dense multilayer PCB

inquiry tip

Tell the manufacturer your assembly process, component pitch and required shelf life.

HASL vs ENIG FAQ

Is ENIG better than HASL?

ENIG is better for some fine-pitch and flatness needs, while HASL lead-free can be practical for many standard boards.

Which finish is more efficient?

HASL lead-free is often more efficient, but final design priority depends on board details and quantity.

What finish should I specify in an inquiry?

Specify the finish required by your assembly process, shelf life and customer requirements.

Need help choosing HASL or ENIG?

Send assembly notes and board files for inquiry review.

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