What is ENIG plating?
Known for its corrosion resistance and uniform plating deposit, electroless nickel immersion gold (ENIG) is a type of plating commonly used for printed circuit boards. Electroless nickel immersion gold plating consists of a layer of gold over a layer of nickel.
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.
Is ENIG better than hasl?
This strong joint also makes HASL a good finish for high-reliability applications. 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.
Is ENIG same as immersion gold?
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.
Is ENIG lead-free?
Electroless Nickel Immersion (ENIG) ENIG is an answer to major industry trends such as lead-free requirements and rise of complex surface components (especially BGAs and flip chips), which require flat surfaces.
What is OSP finish?
OSP is short for “organic solderability preservatives”, and it’s also called anti-tarnish. It refers to a layer of organic finish generated on clean and bare copper by adsorption. On the one hand, this organic finish is capable of stopping copper from being oxide, thermal shock or moisture.
How thick is ENIG plating?
between 0.05 to 0.23 µm
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.
Is ENIG soft gold?
Because of the principle of replacement, the ENIG plating layer is “pure gold”, so it is often classified as “soft gold”, so some people use it for aluminum wire bonding.
What is ENIG PCB finish?
ENIG PCB finish is a double layer metallic coating with nickel that acts as a protective barrier for copper circuits and a surface to weld components on. A layer of gold protects nickel during storage.
What is HASL and ENIG?
HASL has a excellent solder-ability and has a good shelf life. ENIG has excellent corrosion resistance, it is good for aluminum wire bonding, excellent for fine-pitch technology, excellent solder-ability and excellent shelf life.
What is ENIG surface finish?
ENIG is short for Electroless Nickel Immersion Gold, also known as immersion gold (Au), chemical Ni/Au, or soft gold. An ENIG finish is formed by the deposition of Ni-P alloy on a catalyzed Pd surface generated through displacement reaction on a copper surface, followed by a thin layer of gold finish.
Is ENIG RoHS compliant?
An ENIG finish has excellent corrosion resistance; it’s suitable for aluminum wire bonding, is perfect for fine-pitch technology, has excellent solder-ability, and has excellent shelf-life; an ENIG finish is RoHS compliant.