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Gold Finger PCB

Gold Finger PCB

Gold finger PCB are a critical component in the process of transferring signals between different devices. They connect the motherboards of different devices with each other to allow for signal transmission between them.

To ensure that they meet the required standards, the PCB Gold fingers must be visually inspected using a magnifying lens to ensure that the edges of the contacts are smooth and free from excess plating such as Nickel. These edges must also be beveled to ease insertion on corresponding slots.

Chemical composition

Gold fingers are a vital part of the communication between secondary PCBs and the motherboard. They help transmit Gold finger PCB electronic signals and also deliver bulk electric power to the motherboard. These connections are essential for the overall functioning of the device and also ensure that all devices are receiving power at the right time. Without these gold fingers, it would be difficult if not impossible to make changes and improvements to the motherboard.

To ensure a high level of rigidity, the gold plating along the edges of the PCB gold finger should contain between 5 and 10% cobalt. The coating thickness should also be within the standard range of 2 to 50 microinches. A visual inspection test should be conducted through a magnifying glass to verify that the contact edge is smooth and has a clean surface. The plating should also be free from excess coating like nickel.

Initially, between three and six microns of nickel are plated on the connector edges of the gold fingers. Next, a layer of hard gold is plated on top of the nickel. This layer is often enhanced with cobalt to boost its surface resistance. The edges of the gold plate must be beveled to meet certain height specifications. This is done to improve the ability of the PCB to withstand repeated insertion and removal.


Gold fingers connect other devices, such as memory card adapters and flash drives, to the main computer circuit board. They also distribute power and conduct signals between the main and secondary boards. They can be removed and inserted numerous times during the course of a PC’s life. Because of this, it is important to maintain a high standard of plating on these contact edges. If the plating is too thin, it can wear off easily and cause problems with connectivity. In addition, the surface finish should not be too rough and must adhere well to the copper.

The first step in the gold finger plating process is nickel plating. This step involves between three and six microns of nickel plated to the connector edges. Afterwards, between one and two microns of hard gold is plated over the nickel. This layer is typically enhanced with cobalt to boost surface resistance. Additionally, the edge connectors on the gold fingers must be beveled to ensure quick insertion into corresponding slots.

The IPC recommends doing a visual inspection of the contact edges before proceeding to other steps in the manufacturing process. This will help ensure that the edges are clean and smooth and do not contain excess plating or nickel appearance. In addition, the IPC recommends performing a tape test, which consists of placing a strip of tape over the contacts and checking for traces of gold after removing it. If the tape contains traces of gold, it is likely that the plating does not have sufficient adhesion.


The beveling of the PCB gold fingers is important for ensuring that they fit into the corresponding slots on the other board. Generally, the connector edges are beveled at angles of 30 to 45 degrees. These angles ensure that the edge connectors snap into place easily. The beveling process is also done based on the specifications of the client.

Nickel is plated first on the copper of the finger connectors, and then one to two microns of hard gold are applied over it. This gold is often alloyed with cobalt for boosted surface resistance. The nickel layer is then beveled to ease insertion of the gold finger on its corresponding slot.

When selecting the gold plating, you should use flash gold because it has the highest Gold Finger PCB Supplier strength among other types of gold. This type of gold is ideal for use in harsh industrial areas. The gold must also be plated with 5 to 10 percent cobalt for maximum rigidity along the finger connectors’ edges.

During the manufacturing process, the gold finger is subjected to several tests and inspections to ensure that it will work properly. A visual test is conducted using a magnifying lens to ensure that the edges are smooth and free of any excess plating. The tape test is another critical inspection technique. It involves fastening a strip of tape over the contact edges and then inspecting it for traces of gold. If the edges aren’t adhered well, then the plating won’t be able to survive the continuous insertion and ejection of the PCB.


Gold fingers PCB are gold-plated connector points on the edges of a printed circuit board. They are also known as Edge Connectors, Gold Connectors, or Contact Fingers and are used in various electronic applications. They provide contact points for the circuit boards with external equipment and machinery and serve as interconnections between the motherboard and secondary PCBs. They are also used to make special adaptors and external connectors for a computer, such as those that allow you to connect additional sound or graphics cards.

They are made from flash gold, which is the toughest form of the material. The thickness of the gold plating varies, but it should be 2 to 50 microinches thick. It should have a smooth texture and be free from excess nickel plating. It should also be tested by a visual inspection using a magnifying lens to ensure that it is clean and free of extraneous gold.

Besides being durable, the metal also has low electrical resistance and excellent corrosion resistance. It is easy to solder and is a good choice for electronics that require high-speed signals. The other types of gold available for the PCB include electroless nickel immersion gold (ENIG) and plated hard gold. The latter is 30 microinches thicker and is more durable than ENIG. However, it is not a suitable choice for electronics that are subject to frequent use or plugging and unplugging.