HASL
From Wikipedia, the free encyclopedia
HASL is an acronym that stands for Hot Air Solder Leveling, a type of finish for printed circuit boards (PCB).
[edit] Description
The PCB is typically dipped into a bath of molten solder such that all exposed copper surfaces are covered by solder. Excess solder is removed by scraping the PCB with hot air knives.
[edit] Advantages of HASL
- Excellent wetting during component soldering
[edit] Disadvantages of HASL
- Low planarity makes this surface finish unsuitable for use with fine pitch components
- High thermal stress during process may introduce defects to PCB
