What is ENIG in PCB?
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. ENIG is now arguably the most used finish in the PCB industry due the growth and implementation of the RoHs regulation.
How is ENIG done?
The gold is typically applied by quick immersion in a solution containing gold salts. Some of the nickel is oxidized to Ni2+ while the gold is reduced to metallic state. A variant of this process adds a thin layer of electroless palladium over the nickel, a process known by the acronym ENEPIG.
How thick is ENIG plating?
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.
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.
Is Enig a RoHS?
ENIG PCB finish is a double layer metallic coating with nickel that acts both as a protective barrier to the copper circuits and a surface on which the components are welded. A layer of gold protects nickel during storage. Enig is Rohs compliant and people tend to use the tersm together.
Is Enig conductive?
excellent electrical conductivity, anti-oxidation & anti-rust, good heat dissipation, higher surface thickness.
Is Enig hard or 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.
Is ENIG hard or soft gold?
Is ENIG a RoHS?
Is Enig lead-free?
ENIG. ENIG is short for Electroless Nickel/Immersion Gold and its structure is displayed below. As a lead-free surface finish, ENIG features some obvious ADVANTAGES, including long storage time, excellent solderability and flat surface.
Is Enig lead free?
What is Enepig?
ENEPIG is a type of surface finish done on copper layer to protect it from oxidation and corrosion in printed circuit boards. This surface finish improves the solderability of copper and is also RoHS compliant.
What is ENIG finish on PCB?
What’s ENIG? ENIG refers to Electroless Nickel Immersion Gold, or called Immersion Gold, is now one of most-used PCB surface finishes. The gold color of ENIG makes it easy to be distinguished. Actually Electroplating Gold possesses a similar color, but rarely used currently.
What is ENIG finish on copper?
Electroless Nickel Immersion (ENIG) ENIG is quickly becoming the most popular surface finish in the industry. It’s a double layer metallic coating, with nickel acting as both a barrier to the copper and a surface to which components are soldered. A layer of gold protects the nickel during storage.
What is Enig plating and why is it used?
ENIG provides good oxidation resistance, excellent surface planarity and allows for easy soldering which results in excellent electrical performance of the PCB board. ENIG is RoHS compliant is therefore one of the most used PCB surface finishes even though it is more complex and expensive when compared to other PCB plating process like HASL.
What’s new in Enig coating technology?
The latest R&D efforts on ENIG have led to the development of a new nickel coating that regulates the stability of the mixture and reduces the nickel layer’s fragility. The PH of this new solution is neutral with less gold content, minimizing costs and corrosion.