Enig PCB

As a professional manufacturer and supplier, all of our Enig PCB are compliant with RoHS. Venture immersion gold PCB provides good plating around the holes in the circuit board.

Venture immersion gold PCB provides various advantages such as high strength, low contact resistance, antifriction, and few chances of oxidation.

For that reason, it helps meet circuit conductivity requirements, as well as protect nickel, and copper layers from oxidation. This also contributes to excellent solderability.

How to proceed the ENIG process?

Pre-treatment: removes oxides from the copper surface, at the same time roughening to increase the adhesion of nickel and gold;

Micro-etching: produces a uniform and flat copper surface.The Activation: coating the copper surface with a layer of palladium (Pd) as a catalyst for the deposition reaction, the palladium ions are reduced to palladium metal to adhere to the copper surface;

Nickel plating: prevents the diffusion between copper and gold, forming a solder base;

Immersion gold: prevents oxidation of the nickel layer.

Difference between ENIG pcb & gold plating pcb.

2.1  The gold thickness of ENIG is more than the gold-plating,and ENIG looks yellow than gold-plating because gold-plated plate has the color of nickel.

2.2  Their crystal structure is different. Relatively speaking, ENIG is easier to solder and also ENIG is less resistant to abrasion when doing gold finger, because enig is more flexible.

2.3  Nickel is only used on the pads of the ENIG board, so the signal transmission in the surface finish does not affect the signal of the copper layer. Also the solder resist layer is firmly bonded to the copper layer.

2.4  The crystal structure of ENIG pcb is much denser than gold-plated board, cause it not easy to oxidation.PCB process for more accurate strict requirements, line width and spacing are below 0.1mm.

2.5  The flatness and service life of the ENIG pcb are better than that of the gold-plated board.

Why we prefer ENIG pcb in most assembly orders?

Electroless Nickel Immersion Gold (ENIG) surface finish is an extremely flat finish for copper solder pads.

For fine pitch components, such as 0.5mm pitch and smaller BGAs and other ICs, it is important to have a flat pad surface to ensure uniform contact between all contacts and the solder paste.

In contrast the HASL surface finish consists of a thin layer of solder that leaves an uneven rounded curved moon surface at the edge of the pad, which leads to solder defects in fine pitch components.
Defects due to poor pad flatness are difficult to detect and repair, and can lead to poor yields.

Therefore, for Venture PCB assembly orders, we recommend spending a little more for ENIG surface finish.

Venture Enig PCB is widely used in different application:

• computers
• mobile phones
• consumer electronics
• automotive electronics

Venture offers durable and hard coating Enig PCB. Even though it is more expensive than other PCB finishes, Venture Enig PCB has a long shelf life and last for years.

Also, our Venture Enig PCB has good corrosion resistance, excellent solder-ability, remarkable shelf-life, and excellent for fine-pitch technology. So, Venture Enig PCB is best suited for aluminum wire bonding.