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What Is Gold Finger PCB?

What Is Gold Finger PCB?

Gold finger PCB are specialized connectors used to connect devices like memory cards and audio adapters to circuit boards. They are hardened by using flash gold to minimize wear and tear. They are also plated with nickel and cobalt to resist corrosion.

They are inspected and tested to ensure they meet standards that ensure a good fit with slots. These tests include fastening a strip of tape along the edges and inspecting it for plating traces.


The gold fingers present on a PCB edge connector are usually beveled. This ensures that they easily slip into the slot of another device. This is a common feature in most electronic devices. The beveled edges should pass a simple visual inspection, which can be carried out through a magnifying lens. The edges should also be free of excess plating, such as Nickel.

There are specific design specifications that should be followed when manufacturing PCB gold fingers. These include thickness and chemical composition. Generally, the fingers are made of flash gold, which is hardened by Nickel and Cobalt. This makes the edges more rigid and prevents wear and tear. Moreover, the internal PCB layers should be copper-free to prevent exposure during the beveling process. Additionally, the plated-through holes should be kept at least 1 mm away from the gold fingers. It is also necessary to maintain clearance of solder mask and silk screen printing from the gold-plated PCB edges.

A good quality PCB gold finger should have a thickness between 2 and 5 micro inches. The Nickel plating should be done before the gold plating. The final layer is a thin coating of Gold, which should contain between 5 and 10 percent Cobalt to boost rigidity and resist oxidation. The PCB gold-plated edges should be inspected for quality and consistency by a skilled technician.


PCB Gold Fingers are important components that help with the transmission of signals in the field of electronics and electrical engineering. They are often found in computers and other devices that use signals for communication between different hardware parts. They can also be used to transfer power between devices. They are designed and produced in accordance with specific standards. These include the use of flash gold and nickel plating. These are usually enhanced with cobalt for boosted surface resistance. Additionally, the edges of these connectors must be beveled for easier insertion into the corresponding sockets.

The thickness of the gold used in the PCB Gold Fingers is also an important consideration. The gold used in these connectors should be of a specific thickness to minimize wear and tear. Moreover, the plating process should be done in stages to ensure that the fingers are properly aligned and have a uniform thickness. In addition, Gold finger PCB the pads on the gold finger should be made as solder mask openings to avoid solder drop off during long-term plugging.

The gold finger on the PCB should be made using immersion gold technology to ensure its solderability and electrical properties. This type of coating is ideal for high-requirement applications such as memory boards. Furthermore, the PCB should be plated with hard gold for added friction resistance and durability.


PCB gold fingers are responsible for all the electronic connectivity that prevails in today’s digital world. From smart phones to mass manufacturing machines, everything uses gold-plated circuit boards to ensure flawless connectivity and power transfer. But what makes them so important and liable for such incredible up-gradation in smart technology? As a result of rapid technological development, smartphones, personal computers and other electronics tend to get faster. However, this would not be possible without the interactions between the main processing PCBs and the intermediary gold-plated ones.

The plating process for these gold-plated contacts involves a series of steps that must be adhered to strictly. The connector edges are beveled at specified angles, allowing for perfect connectivity along the connective surfaces. They also need to be plated with nickel before a layer of hard gold is applied. The nickel layer is typically enhanced with cobalt for boosted surface resistance.

The most common way of applying the gold-plated layer on a PCB is via electroless nickel immersion gold (ENIG). But this isn’t an ideal option for connectors that go through frequent insertion and removal cycles. This is why the better choice is a compound process that uses ENIG for most of the board and a layer of hard gold on the gold-finger connectors. The hard gold layer is usually thick enough to offer sufficient strength and reliability for such repeated use.


PCB gold fingers are a crucial element of a computer’s motherboard. They allow secondary PCBs to be easily connected and inserted into the motherboard. They also provide power to the device. Unlike other connectors, PCB gold fingers are less prone to damage from abrasion. They are also a great choice for making connections to peripheral devices such as monitors, printers and external Wi-Fi adaptors.

The process of assembling a gold finger PCB requires special care to ensure the quality of the finished product. This includes the use of accurate beveling, as well as a careful deburring process. This is an important step because it prevents the edges of the copper plating from getting caught on the solder pads, which could cause complications or even safety hazards.

There are two types of PCB gold fingers: Uniform and Non-uniform. Uniform PCB gold fingers have equal lengths and a Gold Finger PCB Supplier uniform width. They are also less prone to corrosion. However, these are more expensive than Non-uniform PCB gold fingers.

Creating PCB gold fingers that meet international manufacturing standards is not an easy task. It is important to have an experienced team that can create high-quality products in a short time frame. This is because of the complexity of the manufacturing process and the need to comply with all industry requirements. It is also important to note that PCB gold fingers should be made from high-quality metals, such as nickel or copper.