ENIG is a two layer metallic coating of 2-8 μin Au over 120-240 μin Ni. The gold protects the nickel during storage and also provides the low contact resistance required for the thin gold deposits. ENIG is now arguably the most used finish in the PCB industry due the growth and implementation of the RoHs regulation.
What is the difference between ENIG and HASL?
HASL is generally preferred for hand-soldering due to the easy joint formed. However, HASL leaves an uneven surface despite the leveling process. ENIG, on the other hand, provides for a very flat surface making ENIG preferable for fine pitch and high pin count components especially ball-grid array (BGA) devices.30 Apr 2020
How thick is ENIG finish?
ENIG plating thickness of each layer should be between 0.05 to 0.23 µm for the immersion gold layer and 2.5 to 5.0 µm for the electroless nickel. The thicker the immersion gold layer, the more likely it is to result with a black pad due to process complications.22 May 2020
How does immersion gold work?
Immersion gold is a process that applies a very thin layer of gold with displacement of the surface atoms. It means the coating is not very thick, and it can be used for extending the shelf life of parts waiting for soldering operations because of corrosion resistance.
What is ENEPIG surface finish?
ENEPIG as a Surface Finish PCB surface finish is a crucial component of an assembled board as it will prevent the copper traces, pads, and soldering from oxidation; it is a vital ingredient to high-level application performance.
What is ENEPIG plating?
ENEPIG is a type of metal plating for PCBs. Nicknamed the “universal surface finish” for its ability to be deposited on just about any PCB assembly, ENEPIG finishes are primarily used to support soldering and gold and aluminum wire bonding.
What is ENIG surface finish?
ENIG is a two layer metallic coating of 2-8 μin Au over 120-240 μin Ni. The Nickel is the barrier to the copper and is the surface to which the components are actually soldered to. The gold protects the nickel during storage and also provides the low contact resistance required for the thin gold deposits.
What is a HASL finish?
HASL is the predominant surface finish used in the industry. The process consists of immersing circuit boards in a molten pot of a tin/lead alloy and then removing the excess solder by using 'air knives', which blow hot air across the surface of the board.
What is ENIG coating?
Electroless nickel immersion gold (ENIG or ENi/IAu), also known as immersion gold (Au), chemical Ni/Au or soft gold, is a metal plating process used in the manufacture of printed circuit boards (PCBs), to avoid oxidation and improve the solderability of copper contacts and plated through-holes.
How thick is the gold in ENIG?
The typical thickness ranges from 0.05 0 23 µm (2 9 µ in) gold over 2.5 5.0 µm (100 200 µ in) electroless nickel. This thickness remains consistent throughout the PCB.11 Oct 2019