PCBTok’s Supremely Engineered ENIG PCB

PCBTok’s ENIG PCB is the highly recognized surface finish in the PCB industry, and we are also renowned for producing superior products of it internationally.

  • We provide several various payment alternatives.
  • Updates on the product progress are sent every week.
  • We are ensuring full support for your PCBs.
  • Our supply of parts is sufficient to meet your requests.
  • Constant access to knowledgeable, expert assistance.
Get Our Best Quotation
Quick Quote

Superior Quality ENIG PCB Products by PCBTok

PCBTok continuously aims to supply you with flawless ENIG PCB that will function for a long time without facing any issues.

We constantly seek your satisfaction with the ENIG PCB products and the services you deserve. We are always motivated by your fulfillment.

These are all made possible by our more than a decade of experience and highly-trained experts in our facility to perfect your products.

PCBTok will persistently thrive to provide you with the best.

We genuinely care for our clients; thus, we are always striving to improve our skills to continually serve you the highest quality ENIG PCB possible.

Read More

ENIG PCB By Feature

Multilayer ENIG PCB

The Multilayer PCB is highly preferred in applications such as mobile phones due to its compact size that can integrate a number of components into a device. In addition, due to its capability to produce high-speed performance in devices.


The HDI PCB are preferred by consumers seeking to decrease their overall power usage since the HDI material can fulfill this. These are also popular in various applications because they can offer long battery life in devices.


The Rigid  PCB is one of the most famous types of PCB because of its inexpensive cost, and they are widely used by most electronic devices nowadays. Therefore, they have higher demand and supply in the PCB industry.


The High TG PCB is recognized for its extraordinary stability due to its resistance to chemicals, moisture, and heat. Through this, it can achieve a longer life span and prevent short circuit occurrences and failures in the PCB.

Heavy Copper ENIG PCB

The Heavy Copper PCB is well-known for its exceptional dissipation factor; it can prevent overheating overall components. They are popular in military applications such as power supply, and radar systems.

Flexible ENIG PCB

The Flexible PCB is popular because of its affordable costs and versatility. They are perfectly suitable for applications that have a limited amount of space. It is also known that this type can be easily installed and maintained.

ENIG PCB By Layer (5)

  • 4-Layer ENIG PCB

    The 4-Layer PCB is perfectly ideal for your applications if it requires complex routing since this layer is more than capable of integrating these types of scenarios. This is composed of four-layer of glass fibers.

  • 8-Layer ENIG PCB

    The 8-Layer PCB has an improved EMC performance compared with other lower-layer PCBs. It can offer a lot more routing layers and high-speed signal routing in comparison to other lower count layers of the board.

  • 12-Layer ENIG PCB

    The 12-Layer PCB can accommodate more circuitry and wiring into its inside layers; thus, they are ideal if your applications require complex circuitry such as for mobile devices, laptops, and many other electronic devices.

  • 14-Layer ENIG PCB

    The 14-Layer PCB has a more durable pad attachment compared to other lower layered count PCBs. It has good control of thermal management. They are preferred in industrial applications like control systems.

  • 16-Layer ENIG PCB

    The 16-Layer PCB is popular for its compact size even with its numerous layer incorporated; it has been laminated and squeezed. They are widely used in high-speed and high-density applications.

ENIG PCB By Gold Thickness (6)

  • 1u'' Gold ENIG PCB

    The 1u” Gold PCB is the most conventional, and the most standard thickness for the board. They are commonly deployed in high-precision PCB due to their exceptional flatness and solderability.

  • 2u'' Gold ENIG PCB

    The 2u” Gold PCB is the most ideal and recommended thickness of gold in your board. In addition, it is recognized to be fairly reasonable in every prototyping service that can perform on average.

  • 3u'' Gold ENIG PCB

    The 3u” Gold ENIG PCB is the maximum thickness in the standard guideline of gold. Just like the 1u”, they are also preferred in the high-precision board that has bonded IC due to their good conductivity.

  • 4u'' Gold ENIG PCB

    The 4u” Gold ENIG is a good match for a nickel layer thickness that has a value of 100u” to 200u”. Nevertheless, we are capable of customizing this type of gold thickness depending on your application.

  • 10u'' Hard Gold PCB

    The 10u” Hard Gold PCB is ideal if you’re seeking more durability, stability, and reliability in your circuit board. Moreover, we are highly capable of customizing this sort of thickness for your purposes.

  • 50u'' Hard Gold PCB

    The 50u” Hard Gold PCB is the highest thickness we can offer for your board. Additionally, we can adjust it according to your applications to avoid occurrences of errors along the usage of your board.

Pros of Casting PCBTok’s ENIG PCB

The ENIG PCB has a number of benefits to provide. Here are some of them:

  • Resistance to Oxidation – The occurrence of oxidation was minimized due to the immersion gold layer.
  • Lead – No trace is deployed in the production process of an ENIG PCB.
  • Thermal Management – It can resist enough amount of heat due to the electroless nickel component.

A few of the benefits that an ENIG PCB of PCBTok can provide are those that were just discussed. There are more advantages it can offer to your applications. Please submit an inquiry to us for further information on these.

Pros of Casting PCBTok’s ENIG PCB
Materials Deployed in ENIG PCB

Materials Deployed in ENIG PCB

An ENIG PCB only deployed a few materials, all of which are unquestionably created with the utmost precision and superior characteristics.

The ENIG PCB is composed of Nickel and Gold materials on it. The Nickel layer is commonly found in the copper surface of the board. In addition, we made sure that this layer is resistant to corrosion through the help auto-catalytic liquid bath.

The ENIG PCB is made to be extremely durable and has a longer total shelf life because it not only prevents corrosion to the board but also helps with the oxidation of the electrical components.

For an in-depth explanation about this; you can direct message us.

Appropriate Handling of ENIG PCB

It is regarded that an ENIG PCB is prone to corrosion and oxidation; thus, proper handling of the board and choosing the right manufacturer will be beneficial.

We at PCBTok execute all the necessary means to prolong the life of your products. However, it’s still essential to properly handle it to fully use its utmost performance.

Once oxidation and corrosion occur, it can damage the overall performance of your board. We recommend utilizing gloves when touching the board because using bare hands can also promote the occurrence of tarnishing.

If you want to perfectly handle and maximize the potential of your ENIG PCB, you can directly message us more about this.

Appropriate Handling of ENIG PCB

The Capability of PCBTok in Delivering Deluxe ENIG PCB

The Capability of PCBTok in Delivering Deluxe ENIG PCB
The Capability of PCBTok in Delivering Deluxe ENIG PCB

With our sophisticated process, the ENIG PCB by PCBTok is free from any errors. PCBTok is fully aware of the measures needed to be taken to improve the quality of the ENIG PCB; hence, we are only using the advanced materials on it.

PCBTok also considers improving the skills of our expert team to be suitable to our modern technologies to properly produce a quality ENIG PCB.

Additionally, we continually test the products that we develop to ensure that they are reliable and can perform their designated roles in your operation.

We are doing our utmost best to provide you with the best product and services you deserve; with PCBTok, you’ve genuinely cared!

ENIG PCB Fabrication

Processing Steps: ENIG PCB

In order to obtain a perfect output of an ENIG PCB, we deploy the following three basic phases in the process.

The following processing steps are copper layer activation that including cleaning, micro-etching, and rinsing. The goes through the application of nickel and gold.

Apart from these three basic processing phases, you have the freedom to design, control, and monitor your board for a commendable output.

The mentioned processing steps and the additional ways in perfecting your ENIG PCB are specially designed to produce a high-grade output.

Should you have any questions about this, you can mail us.

Features of PCBTok’s ENIG PCB

It is well-recognized that an ENIG PCB aims to assist in shielding and protecting the entire circuit to improve the board’s overall performance.

There are varieties of phases that an ENIG PCB undergoes to attain its maximum potential without any issues. It includes the consideration of its essential features.

PCBTok considers the RoHS Compliance, Coefficient of Thermal Expansion (CTE), and the Dielectric Constant (DC) for the ENIG PCB.

It has o lead content; we constantly abide by RoHS. We constantly monitor its CTE to make sure it’s matched with conductive layers.

If you wish to have in-depth knowledge about this, message us.

OEM & ODM ENIG PCB Applications

ENIG PCB for Consumer Electronics

Most Consumer Electronics are prone to heating since they are used for quite a long time; thus, ENIG PCB utilization is beneficial in this matter.

ENIG PCB for Automotive Electronics

Automotive components can be prone to moisture occurrences; through ENIG PCB, there’s no need to worry about such situations.

ENIG PCB for Medical Applications

It is recognized that an ENIG PCB is exceptionally reliable; hence, they are highly preferred in medical equipment for longer usage.

ENIG PCB for Computer Systems

One of the advantages of using ENIG PCB is its capability to resist heat efficiently; thus, they are extremely suitable for computers that emit heat.

ENIG PCB for Security and Military Applications

Security and Military Applications require versatility and longer shelf life in their applications; an ENIG PCB is capable of doing such.

PCBTok - China’s Extraordinarily Talented ENIG PCB Provider

As a top producer in China, we hold the necessary accreditations and standards.

Our goal is for consumers to be pleased with services and products.

ENIG PCB Production Details As Following Up

NO Item Technical Specification
Standard Advanced
1 Layer Count 1-20 layers 22-40 layer
2 Base Material KB、Shengyi、ShengyiSF305、FR408、FR408HR、IS410、FR406、GETEK、370HR、IT180A、Rogers4350、Rogers400、PTFE Laminates(Rogers series、Taconic series、Arlon series、Nelco series)、Rogers/Taconic/Arlon/Nelco laminate with FR-4 material(including partial Ro4350B hybrid laminating with FR-4)
3 PCB Type Rigid PCB/FPC/Flex-Rigid Backplane、HDI、High multi-layer blind&buried PCB、Embedded Capacitance、Embedded resistance board 、Heavy copper power PCB、Backdrill.
4 Lamination type Blind&buried via type Mechanical blind&burried vias with less than 3 times laminating Mechanical blind&burried vias with less than 2 times laminating
HDI PCB 1+n+1,1+1+n+1+1,2+n+2,3+n+3(n buried vias≤0.3mm),Laser blind via can be filling plating 1+n+1,1+1+n+1+1,2+n+2,3+n+3(n buried vias≤0.3mm),Laser blind via can be filling plating
5 Finished Board Thickness 0.2-3.2mm 3.4-7mm
6 Minimum Core Thickness 0.15mm(6mil) 0.1mm(4mil)
7 Copper Thickness Min. 1/2 OZ, Max. 4 OZ Min. 1/3 OZ, Max. 10 OZ
8 PTH Wall 20um(0.8mil) 25um(1mil)
9 Maximum Board Size 500*600mm(19”*23”) 1100*500mm(43”*19”)
10 Hole Min laser drilling size 4mil 4mil
Max laser drilling size 6mil 6mil
Max aspect ratio for Hole plate 10:1(hole diameter>8mil) 20:1
Max aspect ratio for laser via filling plating 0.9:1(Depth included copper thickness) 1:1(Depth included copper thickness)
Max aspect ratio for mechanical depth-
control drilling board(Blind hole drilling depth/blind hole size)
0.8:1(drilling tool size≥10mil) 1.3:1(drilling tool size≤8mil),1.15:1(drilling tool size≥10mil)
Min. depth of Mechanical depth-control(back drill) 8mil 8mil
Min gap between hole wall and
conductor (None blind and buried via PCB)
7mil(≤8L),9mil(10-14L),10mil(>14L) 5.5mil(≤8L),6.5mil(10-14L),7mil(>14L)
Min gap between hole wall conductor (Blind and buried via PCB) 8mil(1 times laminating),10mil(2 times laminating), 12mil(3 times laminating) 7mil(1 time laminating), 8mil(2 times laminating), 9mil(3 times laminating)
Min gab between hole wall conductor(Laser blind hole buried via PCB) 7mil(1+N+1);8mil(1+1+N+1+1 or 2+N+2) 7mil(1+N+1);8mil(1+1+N+1+1 or 2+N+2)
Min space between laser holes and conductor 6mil 5mil
Min space between hole walls in different net 10mil 10mil
Min space between hole walls in the same net 6mil(thru-hole& laser hole PCB),10mil(Mechanical blind&buried PCB) 6mil(thru-hole& laser hole PCB),10mil(Mechanical blind&buried PCB)
Min space bwteen NPTH hole walls 8mil 8mil
Hole location tolerance ±2mil ±2mil
NPTH tolerance ±2mil ±2mil
Pressfit holes tolerance ±2mil ±2mil
Countersink depth tolerance ±6mil ±6mil
Countersink hole size tolerance ±6mil ±6mil
11 Pad(ring) Min Pad size for laser drillings 10mil(for 4mil laser via),11mil(for 5mil laser via) 10mil(for 4mil laser via),11mil(for 5mil laser via)
Min Pad size for mechanical drillings 16mil(8mil drillings) 16mil(8mil drillings)
Min BGA pad size HASL:10mil, LF HASL:12mil, other surface technics are 10mil(7mil is ok for flash gold) HASL:10mil, LF HASL:12mil, other surface technics are 7mi
Pad size tolerance(BGA) ±1.5mil(pad size≤10mil);±15%(pad size>10mil) ±1.2mil(pad size≤12mil);±10%(pad size≥12mil)
12 Width/Space Internal Layer 1/2OZ:3/3mil 1/2OZ:3/3mil
1OZ: 3/4mil 1OZ: 3/4mil
2OZ: 4/5.5mil 2OZ: 4/5mil
3OZ: 5/8mil 3OZ: 5/8mil
4OZ: 6/11mil 4OZ: 6/11mil
5OZ: 7/14mil 5OZ: 7/13.5mil
6OZ: 8/16mil 6OZ: 8/15mil
7OZ: 9/19mil 7OZ: 9/18mil
8OZ: 10/22mil 8OZ: 10/21mil
9OZ: 11/25mil 9OZ: 11/24mil
10OZ: 12/28mil 10OZ: 12/27mil
External Layer 1/3OZ:3.5/4mil 1/3OZ:3/3mil
1/2OZ:3.9/4.5mil 1/2OZ:3.5/3.5mil
1OZ: 4.8/5mil 1OZ: 4.5/5mil
1.43OZ(positive):4.5/7 1.43OZ(positive):4.5/6
1.43OZ(negative ):5/8 1.43OZ(negative ):5/7
2OZ: 6/8mil 2OZ: 6/7mil
3OZ: 6/12mil 3OZ: 6/10mil
4OZ: 7.5/15mil 4OZ: 7.5/13mil
5OZ: 9/18mil 5OZ: 9/16mil
6OZ: 10/21mil 6OZ: 10/19mil
7OZ: 11/25mil 7OZ: 11/22mil
8OZ: 12/29mil 8OZ: 12/26mil
9OZ: 13/33mil 9OZ: 13/30mil
10OZ: 14/38mil 10OZ: 14/35mil
13 Dimension Tolerance Hole Position 0.08 ( 3 mils)
Conductor Width(W) 20% Deviation of Master
1mil Deviation of Master
Outline Dimension 0.15 mm ( 6 mils) 0.10 mm ( 4 mils)
Conductors & Outline
( C – O )
0.15 mm ( 6 mils) 0.13 mm ( 5 mils)
Warp and Twist 0.75% 0.50%
14 Solder Mask Max drilling tool size for via filled with Soldermask (single side) 35.4mil 35.4mil
Soldermask color Green, Black, Blue, Red, White, Yellow, Purple matte/glossy
Silkscreen color White, Black, Blue, Yellow
Max hole size for via filled with Blue glue aluminum 197mil 197mil
Finish hole size for via filled with resin  4-25.4mil  4-25.4mil
Max aspect ratio for via filled with resin board 8:1 12:1
Min width of soldermask bridge Base copper≤0.5 oz、Immersion Tin: 7.5mil(Black), 5.5mil(Other color) , 8mil( on copper area)
Base copper≤0.5 oz、Finish treatment not Immersion Tin : 5.5 mil(Black,extremity 5mil), 4mil(Other
color,extremity 3.5mil) , 8mil( on copper area
Base coppe 1 oz: 4mil(Green), 5mil(Other color) , 5.5mil(Black,extremity 5mil),8mil( on copper area)
Base copper 1.43 oz: 4mil(Green), 5.5mil(Other color) , 6mil(Black), 8mil( on copper area)
Base copper 2 oz-4 oz: 6mil, 8mil( on copper area)
15 Surface Treatment Lead-free Flash gold(electroplated gold)、ENIG、Hard gold、Flash gold、HASL Lead-free 、OSP、ENEPIG、Soft gold、Immersion silver、Immersion Tin、ENIG+OSP, ENIG+Gold finger, Flash gold(electroplated gold)+Gold finger, Immersion silver+Gold finger, Immersion Tin+Gold finge
Leaded Leaded HASL
Aspect ratio 10:1(HASL Lead free、HASL Lead、ENIG、Immersion Tin、Immersion silver、ENEPIG);8:1(OSP)
Max finished size HASL Lead 22″*39″;HASL Lead free 22″*24″;Flash gold 24″*24″;Hard gold 24″*28″;ENIG 21″*27″;Flash gold(electroplated gold) 21″*48″;Immersion Tin 16″*21″;Immersion silver 16″*18″;OSP 24″*40″;
Min finished size HASL Lead 5″*6″;HASL Lead free 10″*10″;Flash gold 12″*16″;Hard gold 3″*3″;Flash gold(electroplated gold) 8″*10″;Immersion Tin 2″*4″;Immersion silver 2″*4″;OSP 2″*2″;
PCB thickness HASL Lead 0.6-4.0mm;HASL Lead free 0.6-4.0mm;Flash gold 1.0-3.2mm;Hard gold 0.1-5.0mm;ENIG 0.2-7.0mm;Flash gold(electroplated gold) 0.15-5.0mm;Immersion Tin 0.4-5.0mm;Immersion silver 0.4-5.0mm;OSP 0.2-6.0mm
Max high to gold finger 1.5inch
Min space between gold fingers 6mil
Min block space to gold fingers 7.5mil
16 V-Cutting Panel Size 500mm X 622 mm  ( max. ) 500mm X 800 mm ( max. )
Board Thickness 0.50 mm (20mil) min. 0.30 mm (12mil) min.
Remain Thickness 1/3 board thickness 0.40 +/-0.10mm( 16+/-4 mil )
Tolerance ±0.13 mm(5mil) ±0.1 mm(4mil)
Groove Width 0.50 mm (20mil) max. 0.38 mm (15mil) max.
Groove to Groove 20 mm (787mil) min. 10 mm (394mil) min.
Groove to Trace 0.45 mm(18mil) min. 0.38 mm(15mil) min.
17 Slot Slot size tol.L≥2W PTH Slot: L:+/-0.13(5mil) W:+/-0.08(3mil) PTH Slot: L:+/-0.10(4mil) W:+/-0.05(2mil)
NPTH slot(mm) L+/-0.10 (4mil) W:+/-0.05(2mil) NPTH slot(mm) L:+/-0.08 (3mil) W:+/-0.05(2mil)
18 Min Spacing from hole edge to hole edge 0.30-1.60 (Hole Diameter) 0.15mm(6mil) 0.10mm(4mil)
1.61-6.50 (Hole Diameter) 0.15mm(6mil) 0.13mm(5mil)
19 Min spacing between hole edge to circuitry pattern PTH hole: 0.20mm(8mil) PTH hole: 0.13mm(5mil)
NPTH hole: 0.18mm(7mil) NPTH hole: 0.10mm(4mil)
20 Image transfer Registration tol Circuit pattern vs.index hole 0.10(4mil) 0.08(3mil)
Circuit pattern vs.2nd drill hole 0.15(6mil) 0.10(4mil)
21 Registration tolerance of front/back image 0.075mm(3mil) 0.05mm(2mil)
22 Multilayers Layer-layer misregistration 4layers: 0.15mm(6mil)max. 4layers: 0.10mm(4mil) max.
6layers: 0.20mm(8mil)max. 6layers: 0.13mm(5mil) max.
8layers: 0.25mm(10mil)max. 8layers: 0.15mm(6mil) max.
Min. Spacing from Hole Edge to Innerlayer Pattern 0.225mm(9mil) 0.15mm(6mil)
Min.Spacing from Outline to Innerlayer Pattern 0.38mm(15mil) 0.225mm(9mil)
Min. board thickness 4layers:0.30mm(12mil) 4layers:0.20mm(8mil)
6layers:0.60mm(24mil) 6layers:0.50mm(20mil)
8layers:1.0mm(40mil) 8layers:0.75mm(30mil)
Board thickness tolerance 4layers:+/-0.13mm(5mil) 4layers:+/-0.10mm(4mil)
6layers:+/-0.15mm(6mil) 6layers:+/-0.13mm(5mil)
8-12 layers:+/-0.20mm (8mil) 8-12 layers:+/-0.15mm (6mil)
23 Insulation Resistance 10KΩ~20MΩ(typical:5MΩ)
24 Conductivity <50Ω(typical:25Ω)
25 Test voltage 250V
26 Impedance control ±5ohm(<50ohm), ±10%(≥50ohm)

PCBTok offers flexible shipping methods for our customers, you may choose from one of the methods below.

1. DHL

DHL offers international express services in over 220 countries.
DHL partners with PCBTok and offers very competitive rates to customers of PCBTok.
It normally takes 3-7 business days for the package to be delivered around the world.


2. UPS

UPS gets the facts and figures about the world’s largest package delivery company and one of the leading global providers of specialized transportation and logistics services.
It normally takes 3-7 business days to deliver a package to most of the addresses in the world.


3. TNT

TNT has 56,000 employees in 61 countries.
It takes 4-9 business days to deliver the packages to the hands
of our customers.


4. FedEx

FedEx offers delivery solutions for customers around the world.
It takes 4-7 business days to deliver the packages to the hands
of our customers.


5. Air, Sea/Air, and Sea

If your order is of large volume with PCBTok, you can also choose
to ship via air, sea/air combined, and sea when necessary.
Please contact your sales representative for shipping solutions.

Note: if you need others, please contact your sales representative for shipping solutions.

You can use the following payment methods:

Telegraphic Transfer(TT): A telegraphic transfer (TT) is an electronic method of transferring funds utilized primarily for overseas wire transactions. It’s very convenient to transfer.

Bank/Wire transfer: To pay by wire transfer using your bank account, you need to visit your nearest bank branch with the wire transfer information. Your payment will be completed 3-5 business days after you have finished the money transfer.

Paypal: Pay easily, fast and secure with PayPal. many other credit and debit cards via PayPal.

Credit Card: You can pay with a credit card: Visa, Visa Electron, MasterCard, Maestro.

Quick Quote
  • “To be honest, I’m delighted with PCBTokk’s service delivery, and I’ve never had any complaints about the amount they charge considering that they give you what you really should have. They didn’t think twice about carrying out the thoughts and concepts I had in mind. Additionally, they constantly update me on the progress of my orders; doing business with them is a privilege. If you want a supplier who will regard you as a human and your needs, choose PCBTok!”

    Amanda Hayes, Electronics Technician from Kirklees, United Kingdom
  • “My encounter with PCBTok was terrific. Not once in my career have I come across a business that operates so rapidly and treats its clients with dignity. When I am interacting with business, it has always been the opposite way around. With PCBTok, meanwhile, I received a response regarding my design in less than a day. They provided me with information on how to execute my transaction fast, and they assured me of a number of warranties. Considering that the supplier and I are in completely different time zones, it didn’t even take me months to get my order. I heartily recommend PCBTok if you’re looking for a manufacturer that won’t give you headaches. You won’t regret it at all.”

    Walter Christensen, Owner of a Computer Accessories Shop from Idaho, USA
  • “I’d like to give my genuine appreciation for PCBTok’s surface finished PCBs, they are all in flawless state. I was glad that I made a great decision of purchasing a bunch of ENIG PCBs from them. They provided me with PCBs of exceptional quality at a very reasonable cost, and their service is exemplary. They never failed to prioritize my needs, and they constantly consider my views concerning the products they were making for me; it was a really good move of them. I guarantee you that you will never have any issues with your orders if you go for the products and services of PCBTok; they’re highly recommended by professionals too!”

    Dylan Stewart, Design Engineer from Banff, Canada

ENIG PCB – The Ultimate FAQ Guide

ENIG PCB is a printed circuit board (PCB). In consumer electronics, well-made PCBs are essential. They must have the proper number of vias to allow electronic signals to pass through each layer. A common problem with ENIG is black pads. The best way to avoid it is to maintain an acceptable pH in a nickel bath. If you are unsure how to perform this operation, the Ultimate FAQ Guide will explain everything.

The ENIG PCB has several distinguishing features. It can be available in single-layer or multi-layers. It is also lightweight, making it ideal for small to large devices. However, one of the drawbacks of this type of PCB is its high cost. Because of the high cost, ENIG PCBs can be difficult to repair and update. Therefore, it is crucial to carefully check the specifications of the device before purchasing.

Immersion tin and immersion gold are two materials commonly used in PCB production. The former is an excellent choice for fine-pitch products. The latter is an excellent choice for backplanes. Both are corrosion-resistant and environmentally friendly. However, ENIG is not suitable for all applications. In some cases, the gold coating may corrode the nickel, resulting in black pads. This problem can easily be solved by placing another material on the ENIG PCB.

What Is ENIG in PCB?

On the pads of the PCB, this coating is gold. Unless you are using the board as an Arduino HAT, most people will not know what the coating is. However, it makes the board solderable and gives it a more professional look. But how does ENIG work in a PCB? Here’s what you should know. It is chemically similar to gold.

ENIG (Electroless Nickel Immersion Gold) is a high-quality PCB surface treatment. It has the added benefit of being RoHS compliant. It also provides excellent solder joints and is extremely resistant to environmental conditions. ENIG is available for all PCB configurations (r) except ValueProto.

Rogers PCB With ENIG

Rogers PCB With ENIG

PCB manufacturers use ENIG to coat copper solder pads with a thin layer of gold to protect them from corrosion and unwanted spreading. Because gold and nickel are compatible, a P-rich nickel layer is formed when the two materials come into contact. In other words, ENIG is a necessary part of the PCB, but it should not be ignored. The other advantages of ENIG are too important to ignore.

The coating process is the most obvious difference between ENIG and HASL. ENIG is more expensive than HASL, but it has many benefits. For example, ENIG creates a flatter surface on the board, which is critical when using large ball grid arrays for packaging. In addition, ENIG is safer and more environmentally friendly than lead plating, eliminates air knives, and slightly improves thermal durability.

Is Immersion Gold the Same As ENEPIG?

ENIG (Electroless Nickel Immersion Gold) is a metal coating used in the production of printed circuit boards. It is typically applied to copper contacts and plated through holes to prevent oxidation and improve solderability. Although there are several variations of this surface treatment, ENIG is the most popular and widely used. The main difference between ENIG and submerged gold is their surface finish.

On printed circuit boards, chemical nickel immersion gold is the most common surface treatment. This is due to its trend toward low-cost and high-density packaging. However, reliability issues have plagued electroless nickel immersion gold (ENIG). This is partly due to the poor wetting properties of the tin solder. Modern facilities are used to determine the root cause of this problem. While ENIG is a reliable surface finish, it has some drawbacks.

Although they have similar surface finishes, Immersion gold has several advantages. Its excellent chemical and physical properties make it ideal for electrical contact, lead bonding, and soldering. ENEPIG offers excellent solderability and corrosion resistance but is more expensive than ENSI. As a result, it is a better choice for a variety of applications. The key to success is choosing the right gold chemistry.

Is submerged gold the same as ENIG in IC manufacturing? It depends. ENEPIG is the next generation of ENIG and is an upgrade to the ENIG process. ENEPIG consists of a thin palladium layer that prevents immersion gold from corroding the nickel layer. Other benefits of this new generation of immersion gold include highly reliable lead bonding, excellent multiple reflow soldering, switching contact surfaces, and selective gold plating.

ENEPIG Surface Finish

ENEPIG Surface Finish

What is the Difference Between ENIG and HASL?

Both ENIG and HASL are electrically insulating coatings. On the other hand, ENIG is more durable and corrosion-resistant. The difference between these finishes is in the way they are applied. HASL is more suitable for complex assembly tasks, while ENIG is more suitable for simpler assembly tasks. EnIG requires less environmental information, such as temperature, humidity, and condensing atmosphere, but it may not be the best choice for all applications.

ENIG is a superior surface treatment for printed circuit boards. It resists corrosion and inhibits dendrite growth and flux reactivation. It is also more expensive than HASL. On the other hand, ENIG is more expensive than HASL. ENIG is preferred by some engineers over HASL because of its higher quality and reliability. ENIG is best suited for corrosive environments, while HASL offers an excellent surface finish for high-quality PCBs.

HASL and ENIG are both chemical plating processes. ENIG is a better alternative to HASL, which is a cheaper and more convenient option. The ENIG process uses two layers of metal coatings. The first layer is chemically plated and the second layer is immersed in gold to prevent nickel oxidation. The nickel protects the base copper by acting as a barrier to the copper. In addition, ENIG has good flatness, making it an excellent choice for fine-pitch devices.

ENIG Surface Finish

ENIG Surface Finish

There is a difference between ENIG and HASL, but the terms are often used interchangeably. The difference lies in the Electroless Nickel Immersion Gold (ENIG) process and the results. HASL, on the other hand, is more trustworthy. It can be used for both plating and soldering. In many applications, the difference between these two plating types is significant. If you are not sure which one to choose, it is best to seek professional advice.

How is ENIG Done?

Before we begin, it is important to define ENIG or Electro-Neural Interface Gold. ENIG is a gold coating applied to the pads of electronic components. Most users will not notice the gold coating on the pads, but it keeps the board solderable and improves its appearance. ENIG should always be stored in rust-proof packaging. You can even purchase a unique ENIG kit for your Arduino.

The reaction between gold and nickel drives the process. High gold thickness and aggressive gold baths exacerbate corrosion, leading to the formation of black pads. This structure is similar to brittle fracture, which creates a cracked structure in the nickel. Shock, vibration, and thermal stress can also weaken the metallurgical bond and lead to black pads. Therefore, ENIG is a critical process in semiconductor manufacturing.

ENIG Structure

ENIG Structure

ENIG finishes on PCBs are often stored in batches before loading the widgets. After loading the components, they are either soldered or lead bonded to the surface mount pads. Compound cleaning is the process of surface activation and chemical cleaning. This is the process of fine-tuning the surface chemistry style. Because plasma can be inserted into narrow spots, this method is often used to process small spaces.

First of all, ENIG is an expensive process. It requires concentrated work progress and relies on the synthetic miracle known as the dark pad. This type of plating creates an ideal surface for gold wire fixation, but it has three drawbacks. It also reduces the high optical density. Therefore, it is critical to understand the advantages and disadvantages of ENIG before deciding to use it. For example, ENIG plating can improve the appearance of metal surfaces.

What Are the Advantages of Immersion Gold?

Immersion gold has many advantages over chemical nickel plating. It has a lead-free surface finish. Since high levels of lead are harmful to humans and can cause kidney and brain damage, using a high-quality lead-free gold plating method is a good choice. In addition to being aesthetically pleasing, submerged gold contains no toxic chemicals. Here are the three most important benefits. They are lead-free electrodes and (ii) electrodes.

Immersion gold has excellent chemical properties, making it an excellent choice for electronic components. The material is also highly testable and has a long shelf life. The nickel layer also acts as a barrier to prevent the oxidation of the gold. The intermetallic compound also has excellent solderability, and the gold layer protects the copper layer from oxidation. It has excellent oxidation resistance and is easy to use.

Immersion Gold PCB

Immersion Gold PCB

One of the most significant advantages of immersed gold is its durability. It is a more permanent layer of gold than electrolytic gold plating. It increases the shelf life of the parts waiting to be soldered. Some products using this process are used in electronics, such as PCB manufacturing and aluminum wire bonding. However, it is not suitable for electrolytic gold plating due to its low adhesion.

EnIG and submerged gold PCBs have excellent electrical properties. Electroless nickel plating and submerged gold are the two most common surface treatments used in the PCB industry, and ENIG plating is the best of the bunch. The best thing about ENIG PCBs is that they can be seamlessly integrated into almost any electronic product. Victory Professional PCB manufacturers can meet even the most difficult specifications. With our services, you get a high-quality surface finish and a cost-effective PCB.

Send Your Inquiry Today
Quick Quote
Update cookies preferences
Scroll to Top