Connector gold contacts than the advantages of tin contacts

In the connection of the connector, there is a contact point whether it is connected to the board to the board to the board. The contact may be small and not easy to look at, but this unprecedented contact is one of the most important components in any connector. When it comes to the contact, it is necessary to talk about the plating of the contact point, and deposit another layer of metal on one metal to protect the conductivity of the connector. At present, the plating material is gold, silver, and tin. It uses the more commonly used tin and the corresponding contacts. We are divided into golden contacts and tin contacts respectively.

As a precious metal, gold will not react with other materials, and gold will not oxidize or discolor in the atmospheric environment. It is also durable in a harsh environment for a long time, which is very suitable for contact with the plating. The chemical properties of the silver are unstable and are prone to silver sulfide, which affects the contact of the contact of the contact parts, welding and other properties; general connectors will use tin plating, because tin is cheaper, has anti -corrosion function, and the texture of tin is relatively soft. It is conducive to the cooperation between the plug and the socket, but because the texture is relatively soft, after multiple insertions, the plating surface is easily worn, which will cause contact ending deformation and cannot reach the design contact force.

Therefore, the gold contacts have the following three advantages:

First, gold -plated can improve the corrosion resistance of the contact, which means that they are more suitable for harsh environments.

Second, this contact is more resistant to insertion and not easy to wear, so the golden contact is a better choice when it is often inserted.

Third, the contact resistance of the gold contact is low. Therefore, compared with the tin contact, the continuity of the gold contact is better, so it is definitely the first choice in the low -voltage circuit (5V and below).

In addition to these basic rules above, the following restrictions must also be used to use gold (or nickel) contacts:

Any type of analog signal (because the tin contact will generate line noise)

Any unpaclatic connector exposed in the industrial environment

Any connector that is less than 1mm due to the growth of the surface of the non -annealing surface of the pure tin -plated tinnus.

The gold contact and tin contacts cannot be applied to the same pairing connector system. The performance of these two plating layers has not yet been more in -depth research, but different standard electrode potentials will cause contact corrosion (gold = +1.5V, tin = +0.15V -you can see how the copper -zinc drainage tank looks), and in the end Reliability will also be lost.