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Goldfinger PCB

Jarnistech > Goldfinger PCB
HDI 8 Layer Goldfinger PCB

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What is Gold Fingers?

There are gold-plated columns along the edges of printed circuit boards (PCBs) that are called gold fingers. The purpose of gold fingers is used to connect an external PCB to the computer’s motherboard. PCB gold finger are also utilized in other devices communicating via digital signals, for instance, smartwatches and smartphones for consumers. Gold is utilized for connecting points of PCBs because of its superior conductivity.

Gold Fingers PCB Board

The default bevel for gold finger is value is 45 degrees as shown in the following figure. The standard plating used for gold finger allow for the use of hard gold and immersion gold.

PCB Gold Finger Bevel

This little finger type has proven to be quite versatile, adaptable to a myriad of functions contingent on its predetermined utility. Below are a some applications:

● Offers connections to network transfer of data.
● Attaches special adaptors.
● Connects various devices to the board. It connects various devices to the.
● It can be used to create an audio adaptors.

Types of Gold Fingers

During the production of gold fingers, there are generally two primary categories of gold that are implemented. These types encompass:

Electroless Nickel Immersion Gold (ENIG):

Electroless Nickel Immersion Gold which is also known by the abbreviation ENIG, has a flat solderable face and is fairly cheap to manufacture. It is however malleable and thin, This makes it a poor choice for PCBs that are frequently inserted into or removed from hardware components.

Electroplated Gold That Is Electroplated Hard Gold:

Electroplated Hard Gold is much thicker than ENIG, usually measuring at 30Us. Its stable, robust nature makes electroplated hard gold an excellent choice for PCBs under constant use.

Why do We Need a Gold-plated Finger?

Industrial applications can face a variety of issues like long-term operations as well as air pollution, temperature and humidity changes dust, shock, corrosion of chemicals, and many other interruptions from outside. Thus, Depending on the situation, any of these factors may negatively affect electronic devices’ reliability. Gold fingers are therefore a robust and long-lasting protection for the electronic components, making sure that the devices function reliably and effectively even under adverse conditions.

What is the Role Played by the Goldfinger on PCB?

● The most significant function of goldfinger is connecting and therefore, it should possess high electrical conductivityand wear resistance corrosion resistance, oxidation resistance.

● In general, The texture of pure gold (gold) is relatively soft does, so goldfinger not use pure gold (gold). Instead, they use a layer of “hard gold (gold compounds)” on top of the plating. This is not just a good way to increase the conductivity from gold but can also improve its wear resistance and the performance of oxidation.

Gold Finger PCB Connector

Get Gold Finger PCBS From JarnisTech

JarnisTech is a full PCB and PCBA service manufacturer and provider in China. We offer all kinds of printed circuit boards and assembly services at a affordable cost. Our huge facility can manage low volume orders thanks to our more than 500 skilled workers.

We are able to supply Gold Finger PCBs that meet your specifications. We are aware of the standards and guidelines that are followed when creating gold fingers. In order to ensure the best performance, we pay close attention to every detail. The quality control system we use is strict and assures top performance. We are accredited through RoHS, ISO, and UL. So our customers can place orders with confidence knowing that we’ll offer the highest quality services in accordance with international standards.

We are equipped to support you with both prototype development and comprehensive assembly processes. Benefit from our quick turnaround feature accompanied by turnkey assembly provisions. We also cater to unique needs like providing a single PCB for buyers keen on testing their designs. For further insights and detailed information, we invite you to reach out to us. Our dedicated team stands ready to deliver comprehensive information and articulate responses to your queries.

Application of Gold Finger PCB

These PCBs with gold fingers are great for use in many applications. Because these PCBs are able to withstand wear and wear, they’re ideal for applications that require high performance.

Telecommunication Industry:

In the telecommunications sector, the Gold finger PCB is essentia. It provide connects between several boards, and allows connections to transfer network information. This PCB is able to make smartphones can work effectively.

Industrial Systems:

This PCB is employed for industrial machines. In many industries, automated machines have internal cards. The gold finger PCBs assist ​link the internal cards to the major source of power. For instance, robot arms generate power with the help of gold finger PCBs.

Different movements are controlled by Different cards, while Gold fingers connect various devices to their cirucit boards.

Automobile Industry:

It is common to find gold finger PCBs in automobile control systems and USB connections. This printed circuit is used to connect certain devices.

Application System for Computers:

Gold finger PCBs are utilized in notebook memory cards, graphics cards and so on. Due to the advantages these PCBs have they play a major part within the computer sector.

Gold Finger PCB: Functions

Gold finger PCB serve a myriad of useful applications, and are famed for their multitude of functionalities. Historically, gold fingers have been fabricated from flash gold, which boasts a thickness ranging from 3u” up to 50u”. Due to its thickness, flash gold is regarded as one of the thickest gold.

Because these PCBs are thick, these PCBs are typically utilized in ‘plug-in and plug-out’ operations. The functionalities of gold finger PCBs encompass the following aspects:

Attach an Electronic Device to PCB Board:

This printed citcuit board allows to connect various devices. For instance, ISA, PCI, and AGP are connected with the use of a gold-plated finger PCB. Additionally to that, the PCB can provide a solid system for data transfer. This PCB can be connected to any device.

These PCBs with gold fingers are the ideal PCB for any system, whether stationary or remote.

Audio Adaptors Connection:

There is a need for a gold finger PCB to help transmit data and signals more efficiently. It also provides high-quality audio and graphics regardless of what it’s employed for.

PCB Goldfinger Bevel

PCB Gold Finger Specifications

Like other electronic components, gold fingers have to be in compliance with stringent specifications and specifications before they are secured to PCB. This ensures that all gold finger components function well and last an extended time.

Gold fingers on PCBs necessitate precise alignment and appropriate lengths to match their respective PCBs. Although the positioning of gold fingers might differ across various PCBs, there exist several consistencies shared amongst all gold fingers. These incorporate:

● Plated holes. Gold fingers cannot be placed near holes that have been plated.
● Contact with a soldering mask. Gold fingers are not allowed to make contact with or be close to screens or solder masks.
● Gold finger orientation. Gold fingers must be aligned so that they face the opposite direction as the PCB’s center.

Gold fingers must conform to IPC standards for thickness cosmetic appearance, chemical composition and adhesion.

The PCB could be unable to communicate with the parent circuit board if any of the above regulations are not observed during the PCB gold finger plating procedure. In addition the PCB may not fit into the slot that is appropriate on motherboards.

The reason that gold is employed for finger connectors on PCBs because of the alloy’s quality and strength. Gold’s strength allows fingers to be inserted and ejected hundreds of time without damaging the contacts that connect them. Without the security of the gold plating the circuit board could easily lose the connecting function after few times.

It’s understandable that you might wonder why gold stands out from other metals. In fact, gold is one of the rarest and most expensive natural elements on earth. Could it be cheaper to plate the edges of PCBs using nickel or copper?Gold, however, is necessary for the functions required of a printed circuit board.

As PCBs developed into the modern form, gold was selected as the best connecting-contact metal based on many aspects. Gold’s main advantages is its electrical conductivity as well as its the resistance against corrosion. To add durability, the gold used on printed circuit boards typically made of cobalt or nickel. These give the gold additional resistance to wear and tear in the face of PCBs that are constantly in use. In the plating process the nickel is a thicker layer between 150 and 200 microinches.

Gold Finger Connector Circuit Board

The standards for production of PCB gold finger were developed as of the year 2002 by Association Connecting Electronics Industries (IPC). The standards were modified in 2012 following the publication of IPC-4556. In 2015 the standards were modified by the publication of IPC A-600 and IPC-6010, currently the most frequently used standards for PCB production. These IPC Standards can be described in the following manner:

Chemical Composition: To achieve the highest rigidity at those edges that connect PCB contacts the gold plating should comprise from between 5 to 10 percent cobalt.

Plating Thickness: The gold fingers’ plating thickness consistently falls within the range of 2-50 microinches. The standard thicknesses by dimensions typically encompass 0.031 inches, 0.062 inches, 0.093 inches and 0.125 inches. Lower thicknesses are generally reserved for prototype purposes, while the thicker dimensions are implemented at connecting edges, often designated for insertion, removal and reinsertion tasks

Test of Visuals: Gold fingers must be able to pass a visual test by a magnifying device. The edges must be smooth and clean surface, and free of any excess metal plating, or the look of nickel.

Tape Test: To evaluate the gold plating’s bond strength and its contacts, a testing approach proposed by the ICP recommends placing a tape strip along the contact edges. Upon tape removal, it should be thoroughly examined for any indications of plating. If there’s any visible gold plating on the tape, it signifies insufficient adhesion of the plating to the contact points.

Gold Finger PCB Design Rules – Know Gold Finger PCB Features

In order to design gold-finger PCBs, there are a few aspects be aware of:

● Gold finger designs are able to be placed either or both sides up to an approximate depth of 25mm from the edge.
● The longest length of the plating pads is typically 40 millimeters when a standard plating baths are used.
● The layers inside must be free of copper at points on PCBs’ edges. If not, beveling could reveal the copper.
● Hard gold is coated on each side of the PCB. Nevertheless, should connectors be positioned on opposite sides, a minimum spacing of at least 150 millimeters must be maintained between the two sides.
● In order to achieve optimal panelization, ensure that you have gold fingers facing outwards in the middle of the panel.. This orientation will ensure the most efficient and effective panel design.
● Have allgold fingers connected to 0.008″ conductor tracetraces. This should be on the edges. This makes manufacturing simpler.
● No silkscreens or even a solder masks can be used near gold fingers.
● Plated pads should be placed on the PCB’s edge since this is an electroplating process. There must exist an electric connection between the pads and the frames of production panels.
● Chemical compositions – For maximum rigidity around connections on the PCB’s edges gold plating should be in the range of 5 to 10 percent cobalt.
● Visual tests Gold fingers should pass the tests performed using magnifying lenses. All edges must have a clear and smooth as well as free of any extra plating or appearance of nickel.
● Tape testing – to test theadhesiveness of gold plating measured through contact Tests are suggested.
● After the tape has been removed, the strip should be examined for plating tracetraces.

If there is any gold plating evident on the tape, that means it doesn’t have enough adhesiveness on its contacts.

Once you have mastered these guidelines, it’s now time to create the PCB with the gold-plated finger.

PCB Gold Finger Beveling PCB

PCB Gold Fingers plating begins after solder masks have been deposited and before the surface finish has been applied. It consists of the steps listed below:

Nickel plating: Nickel is initially plated on the connector edges of the fingers between 2~6 microns.

Gold plating: This step involves between 1 and 2 microns hard Gold is coated on top of the nickel layer. In the general case, Cobalt is also added to Gold to improve the resistance of the surface.

Beveling: After that, the edges are beveled or tapered at a particular angle (30-50 degree) in order to make insertion into the slots easier.

Gold Finger Monitor PCB

Possible Causes of Damage to the Finger PCBs

The primary causes contributing to the damage observed in PCBs with gold fingers include:

Contamination Mostly Using Solder:

Do not place solder masks in close proximity to the gold finger on printed circuit boards. The heat that is generated by any of these devices may cause a contamination of the gold finger, which could cause the damage over time. The solder may cut down the PCB’s longevity.

Surfaces That Have Been Scratched:

It is possible for a gold finger with scratched surfaces to impair with the printed circuit board’s functionality. The majority of scratches are caused by wear and tear. This is the reason why, for PCBs with gold fingers, small scratches will keep deepening. In the future, this could result in permanent damage to your gold-plated PCB.

Reparative Process of Gold Finger PCB:

When damage occurs to a PCB with a gold-plated finger There is a need to fix it. However, there are instances that be encountered where a complete replacement is needed. Here is a simple method to repair a damaged gold finger PCB.

Clean and Examine PCB Gold Fingers:

The first step is to inspect the PCB for gold fingers and find the areas with issues. Use the appropriate detergent to make sure that the fingers coated with gold are clean and tidy.

Remove the Gold Plated or Fingers:

Then, you ensure the damaged parts are tapped off.
Beware: If you’ve been using gold finger PCBs for a long time the time, it’s best to install a brand new version.


The modern day computer and mobile devices become more complicated as companies compete to improve their products and more efficient. When you gather a number of mobile devices and assemble a big computer station, you are liable to have numerous gold-plated circuit boards interacting at the same time. Printers and scanners transmit signals from peripheral devices to motherboard cards via PCBs when you print an article or scan a photo for social media, which receive these signals via PCBs.

Due to gold fingers technology has been able evolve to the current array of devices on mobiles that millions of people are using on a regular basis for these mobilles devices. In addition, gold fingers have improved the efficiency and effectiveness of Industrial.

With increasing technology depend on gold fingers, it is vital to make sure they are plated and tested to the most stringent standards. This is the only way to ensure maximum performance from tech products that use circuit boards. At JarnisTech, we provide PCBs of the highest quality to customers across numerous industries.

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