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The Importance of PCB Gold Fingers

The Importance of PCB Gold Fingers

PCB gold fingers are used to facilitate signal transmission between a peripheral and main circuit board. They can also be used to interconnect modules within a PCB.

They are plated with flash gold, which is able to endure the rigors of continuous use. They are alloyed with nickel or cobalt to provide rigidity.


PCB gold fingers are used to connect secondary circuit boards to the motherboard of a computer. They also serve as connectors for peripheral devices like memory card adapters and flash drives. These devices require a high fidelity data transfer that ensures no loss of information or power. The gold-plated connectors on the gold finger PCB can withstand repeated disconnections without losing their conductivity.

The gold finger PCB is plated with nickel and then a thin layer of hard gold, which gives it its strength. The thickness of the gold varies from 1 to 2 microns. The plating process also includes a beveling step that turns the edges Gold finger PCB of the connectors from square to sloping shapes. This helps make insertion easier and quicker.

It is important to check the plating of a PCB before it goes into production. The IPC recommends a visual test with a magnifying lens. The PCB must have a clean and smooth surface, and the edges of the gold finger should be free of excess nickel or plating. A tape test can also be done by placing a strip of tape over the contact edges. If there are traces of gold on the tape, it indicates that the gold is not adhered well to the copper.

Gold finger connectors should be spaced at least 1 mm away from the edge of the PCB. This is to prevent them from being exposed at the beveling stage. It is also not advisable to have plated holes, SMDs or pads within the same distance as the gold finger connectors.

Chemical composition

Gold finger PCBs are a crucial part of electronic and electrical systems. They help transmit signals and power between devices. However, they can wear down over time due to frequent use. This can result in the loss of data or power. It is important to maintain a proper level of quality to prevent this from occurring. This is why it is essential to follow the specifications of the gold finger PCB.

The plating on PCB gold fingers should be thick enough to avoid oxidation. The thickness should also be consistent across the edges of the board. In addition, the gold should be free of any blemishes or flaws. A visual test should be conducted with a magnifying lens to ensure the gold plating is smooth and even. Finally, a tape test should be performed to check the adhesiveness of the gold plating. If traces of the gold are observed on the tape, it means that the plating is not adhering well to the contact edge.

Another important design specification for PCB gold fingers is that they must not be located near plated-through holes (PTH). In addition, no solder mask or screen printing should be done near the gold fingers. Furthermore, the gold fingers should be positioned such that they face outward from the center of the PCB.

Visual test

PCB gold fingers are important parts of the motherboards of computers and other devices. They facilitate the transfer of signals between different components. This is necessary for the proper functioning of these devices. Hence, they are a key component in the creation of high-end technology such as smartphones and TVs.

The best material for PCB gold fingers is flash gold, which is the hardest form of gold. It has a high conductivity and is extremely durable. PCB gold fingers are also re-workable, meaning they can be repaired and replaced. However, it is important to know the exact specifications of these connectors before purchasing them.

Before gold plating, the edges of the connectors must be beveled. The beveling minimizes a square edge to achieve a sloping edge. It is recommended that the beveling be around 30 degrees. This will ensure that the gold finger contacts are smooth and clean.

The inner layers of the PCB must be copper-free to avoid excess exposure during the beveling process. Additionally, it is important to maintain clearance between the gold fingers and the outline of the board. It is also important to keep the plated through holes (PTH) away from the gold fingers. The PTH should be posited at least 1 mm away from the gold fingers to prevent contamination. In addition, the solder mask and silk screen printing should be clear of the gold fingers.

Tape test

A PCB Gold finger is an essential part of the technology that powers our world today. Its unique composition has made printed circuit boards faster, more versatile, and more resourceful than ever before. It also improves the quality of electronic signals. However, its use comes with some important rules and guidelines that must be followed. Failure to do so could disrupt the signals and cause errors.

Firstly, a PCB Gold finger should be plated with nickel in order to maintain proper rigidity along the edges of the contact. The plating Gold Finger PCB Supplier should also contain between 5 and 10% cobalt. In addition, the edges should be inspected for any potential defects with a visual test using a magnifying lens. Lastly, the tape test should be conducted to check for adhesiveness between the contacts and other parts of the board.

Another important step in the plating process is beveling the edge connectors. This is done by minimizing the squared edges into sloping ones, and it is performed at a specific angle, usually between 30 and 45 degrees. This is vital, because it ensures that the connectors fit their corresponding slots easily and prevents any misconnections or shorting. The beveling is typically performed after solder mask and before applying the surface finish. It is also important to make sure that there are no copper traces on the edges of the contact.