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Immersion Gold PCBs

What is Enig Finish PCB?

Enig refers to Electroless Nickel Immersion Gold, is a type of surface plating used for printed circuit boards. ENIG PCBs (also named ENIG PC boards or ENIG circuit board Construction) consists of an underlying layer of nickel with a thin layer of gold over the top. Enig Finish PCB provides various advantages such as high strenght, low contact resistance and etc, so it's widely used in many applications.

The Advantages & Disadvantages of Enig PCB

Enig PCBs• Easy process mechanism
• Flat surfaceh
• Long Shelf Life
• Good oxidation resistance
• High temperature resistance
• Good electric performance
• Good for PTH (Plated Through Holes)
• No Pb
• Good thermal diffusion
• Expensive
• Black Pad / Black Nickel
• Signal Loss (RF)
• Not Re-workable
• Damage from ET
• Complicated Process

THE Enig PCB Plating Process

To achieve an ENIG finish on your PCB, there are several steps that you should follow.

Step 1: the surfaces and vias intended for the finish first have a nickel layer applied to the copper in an electroless process as a diffusion barrier.

Step 2: a thin gold finish is applied. The gold adheres to the nickel-plated areas through a molecular exchange, which will protect the nickel until the soldering process.

Check VictoryPCB Immersion Gold PCB manufacturing capabilities in the following table:

Surface FinishContentTechnological Capability
Hot Air Solder Leveling(Include:Lead-Free)Min. panel size155*255mm
Max. panel size600*622mm
Board thickness0.60 - 3.20mm
Solder thicknessStandard: 1- 40um
Advance: 5 - 40um
Minimum spacing form SMT pad0.2mm (with s/m   brigde)
0.25mm (without s/m bridge)
Ground to ground or ground to track Spacing0.20mm
OSPMin. panel size75*75mm
Max. panel size610*610mm
Board thickness0.40 - 3.20mm
Coating thickness0.20 - 0.50um
Immersion gold
(According to IPC-4552-WAM1-2)
Board thickness0.20 - 3.2mm
Nickel thickness3.0-6.0μm
Gold thicknessMin. 0.025um
Immersion Ag
(According to IPC-4553A)
Max panel size406*533mm
Board thickness0.20 - 3.2mm
Immersion Ag thickness0.05 - 0.3um
Immersion Tin
(According to IPC-4554)
Max panel size406*533mm
Board thickness0.20 - 3.2mm
Immersion Tin thickness0.75 - 1.2um

PCB fabrication with ENIG surface finish in VictoryPCB

VictoryPCB is one of the most professional pcb fabrication manufacturers in China. We specialized not only in quick-turn pcb prototype, but also large volume PCB fabrication. We give 100% quality guarantee on printed circuit boards with Enig surface finish.

Get an instant quote for high quality PCBs with any surface finish such as enig finish, enepig surface, HASL, OSP and etc, pls please feel free to contact us with, we will be happy to help you.


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