The surface finish of your PCB is designed to protect against oxidation. It also allows for easier soldering of your PCB.
HAL lead free
The Hot Air Solder Levelling (HASL lead free) produces a homogeneous tin coating. This finish provides longer shelf life and good solderability.
Electroless nickel / immersion gold and Immersion Tin
For the electroless nickel / immersion gold and immersion tin surface finish, a thin metal coating is applied onto your PCB using a chemical process. An advantage over HASL lead free is the defined thickness of the metal coating. In addition, we can create thinner conductive patterns on the PCB. For this reason, WEdirekt only offers immersion surfaces for our HDI microvia printed circuit boards.
The shelf life of the electroless nickel / immersion gold and lead-free HASL surface finish is twelve months. Immersion tin has a shelf life of a maximum of six months.