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Gold Finger PCB

Gold finger PCB

Gold Finger PCB

Gold finger PCB are used to connect peripheral devices such as memory card adapters and flash drives. They need to be designed and produced in adherence with specific guidelines, standards and inspections.

These include using either Electroless Nickel Immersion Gold or Electroplated Hard Gold for plating the edge connectors. The latter is more resistant to abrasion and is alloyed with cobalt for added strength. The beveling of the connector edges should be done carefully.

Chemical Composition

Gold is one of the most electrically conductive materials used in PCBs. It is also corrosion-resistant and durable. Its ability to withstand harsh industrial environments makes it ideal for use in rugged electronics. In fact, about 7% of the world’s gold is found inside discarded electronic devices. This is because these devices use PCB gold fingers to connect with each other.

Gold finger PCBs are plated with nickel on the edge of the connecting pads. This layer is deposited at a thickness of between 3 and 50 microns. It is then beveled to meet height specifications and facilitate easy insertion into the corresponding slots. These bevels are typically done at angles between 30 and 45 degrees.

The plating of PCB gold fingers should include 5 to 10% cobalt for optimum rigidity. This helps them stand up to the stresses of continuous insertion and uninsertion. The plating thickness of gold fingers should be between 2 and 50 microinches. Standard thicknesses are 0.031 inches, 0.062 inches, and 0.093 inches. In addition, the inner layers of the copper should be free of copper for preventing exposure during the beveling process. Additionally, solder masks and screen printing should be kept away from the gold fingers.

The beveling process of PCB gold fingers should take place after the disposition of Gold finger PCB solder masks and the application of nickel. A magnifying lens should be used to inspect the edges of these connectors for smooth and clean surfaces. There should also be no exposed copper or nickel on the contact edges of the gold fingers.


Gold finger PCBs help to distribute power between the motherboard and secondary circuit boards. They also allow the transmission of digital signals between devices. They are used for many different purposes, including providing a means for computer users to upgrade their sound and graphics cards without having to disconnect or reboot the entire system.

In order for the gold finger to be a reliable contact, it must adhere to industry standards of thickness, chemical composition, and appearance. The gold plating should consist of 5-10% cobalt, and the edges must be well-shaped and shaved to create a sloped surface for easy insertion. In addition, the internal layers must not contain copper. This is because copper creates too much exposure during the beveling process.

A common type of Gold finger PCB is one that has a flat solderable surface, known as ENIG. It is relatively inexpensive to produce and can be used for smaller boards that will not be in constant use. For more durable and rugged PCBs, however, it is recommended to use electroplated hard gold. This material is more resistant to corrosion than standard immersion gold and has a higher density than ENIG.

In addition, it is important to inspect the gold fingers for plated nickel exposure and excess plating. This can be done by performing a visual test on the edges of Gold Finger PCB Supplier the contacts with a magnifying lens. In addition, it is suggested to perform a tape test by placing a strip of white tape along the edge of the contacts and then pulling it off to examine for any signs of gold plating on the tape.


PCB gold fingers are used to connect peripheral devices with the motherboard, such as monitors, printers and scanners. They also serve as connector points in computers for connecting additional hardware like speakers and high-fidelity sound cards. Gold finger PCBs are typically found in laptops and desktops, as well as industrial applications that use computerized machinery.

PCBs with gold fingers are plated using an electroless nickel immersion gold (ENIG) process. This method uses a combination of nickel and gold to provide a stronger plating for areas that are likely to be repeatedly unplugged and reinserted. The thickness of the gold plating varies. It is typically between three and six microns for the connector edges. The plating is then beveled to specific angles.

A visual test should be conducted with a magnifying lens to ensure the edges have a smooth texture and are free of excess plating like nickel. It is also recommended that a strip of tape be placed along the contact edges and then removed. If there are traces of gold on the tape, it indicates that the plating is not adhering well enough.

To avoid errors, a gold-finger plating technician should not make any solder mask opening treatment or screen printing close to the edges of the circuit board. They should also keep a 1 mm distance between the gold-finger PCBs and the plated through holes (PTH) to avoid contamination.


Gold fingers are the narrow connectors that are used to make connections between different circuit boards. They are plated with gold, and they are also made of flesh gold (the hardest form of gold) to ensure that they are durable. They are sometimes combined with Nickel and Cobalt to increase their rigidity.

PCBs are used in a variety of devices, and they must communicate with each other to operate. Gold fingers are able to transmit the signals needed for this communication, and they are essential for modern-day technology. They are also used in computerized industrial machinery, such as assembly plants and manufacturing machines.

To produce the best-quality Gold finger PCB, it is important to adhere to IPC standards regarding thickness, chemical composition, and appearance. In addition to this, the internal PCB layers towards the edges of the PCB should be copper-free to prevent exposure during beveling. It is also advisable to keep a distance of at least 0.5 mm between the gold fingers and the PCB outline. It is also a good idea to avoid placing the gold fingers near solder masks and screen printing, as this can compromise their quality and functionality.

The first step in the process of making a Gold finger PCB is to nickel plate the contact edge of the gold fingers. After this, the edges are beveled – or tapered – at a certain angle, usually between 30 and 45 degrees. This makes them easier to insert into the corresponding slots.