In order to better improve the performance of the pin header and female header (socket), we can achieve it from the following points.
1. The control of the thin film on the surface of the contact plating layer that already exists or is about to be formed.
A major requirement for the electrical performance of the pin headers is to establish and maintain a stable impedance. To achieve this, a metal contact interface is needed to provide such inherent stability. The establishment of such a contact interface requires that the surface film can avoid or split when contacting and fitting. These two different choices clarify the difference between rare metals and ordinary metals.WIN-WIN's pin header and socket are always plated with good film,the materials of this plated layer are gold or tin.And the thickness of this film is selectable.Customers can choose what kind of material and how thick it is. Our standard models are offen be plated with gold flash.The contact parts with gold plated are better than tin plated.Whether it is the difficulty of tin plating or the degree of oxidation resistance,gold plated is better.So many customer will always choose gold plated.
2. To some extent, the nature of rare metal coatings (such as gold, palladium, and their alloys) is free to the surface film.
For these coatings, the metal contact that creates the interface is relatively simple, because it only requires the movement of the concomitant of the contact surface during mating, which is usually easy to achieve. In order to maintain the stability of the impedance of the contact interface, the design requirements of the pin headers and sockets should pay attention to maintaining the precious metal of the contact surface to avoid the influence of external factors such as pollutants, the diffusion of the substrate metal, and contact wear.
3. Ordinary metal coatings, especially tin or tin alloys, are naturally covered with an oxide film.
The role of the tin contact plating layer is because this layer of oxide is easily destroyed during mating, so that the metal contact is easily established. The requirement of the pin header and socket design is to ensure that the oxide film breaks when the pin header is mated with socket, and to ensure that the contact interface is not oxidized during the validity period of the electrical connector. Reoxidation corrosion, in wear corrosion, is the main performance degradation mechanism of tin contact plating. The pin header socket silver contact coatings are best regarded as ordinary metal coatings because the coating is susceptible to corrosion by sulfides and chlorides. Due to the formation of the valve warp, nickel plating is generally regarded as an ordinary metal.
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