What is ENIG in PCB manufacturing?

Electroless Nickel Immersion (ENIG) 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 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.

How does an ENIG work?

ENIG creates a highly solderable surface that won’t discolor or tarnish; it provides exceptional electrical continuity. The nickel component forms a barrier against copper diffusion and guards against contamination of the solder during soldering and re-work. ENIG also contributes EMI shielding.

What is ENIG finishing?

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.

What does ENIG look like?

ENIG is a two-layer metallic coating – Nickle is the barrier to the copper pad and is also the material to which components are soldered. Gold on the other hand protects the Nickle during storage and also provides low contact resistance.

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 lead-free?

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. Its key DISADVANTAGE lies in relatively high cost and “black pad” risk.

Is ENIG lead free?

Is ENIG conductive?

excellent electrical conductivity, anti-oxidation & anti-rust, good heat dissipation, higher surface thickness.