A USB socket is one of many sockets, and many people will also call a USB connector because this is also a kind of connector. There are many types of USB sockets and USB sockets, but their functions are similar.
The role of USB socket
First, the surface of the general metal plating is covered with an oxide film to prevent the oxide film from cracking when the USB socket is mated, ensuring that the contact interface is not oxidized.
Second, optimize the USB socket electrical performance, establish and maintain USB socket impedance.
The role of three, to a certain extent, improve its mechanical properties, enhance wear resistance.
Function 4. The coated USB socket is not easily oxidized and vulcanized.
The role of five, the precious metal coating on the interface of the metal contact is relatively simple, maintaining the stability of the contact interface impedance
The difference between USB socket crimping and no crimping
USB sockets On the surface, USB hubs are mostly curled, and USB dongles are not crimped, but some machines are also useful for the sake of space saving without crimping. For the USB female seat, the difference between crimped and uncrimped is:
First, the curling can be grounded with the shell of the shell and can be more closely contacted.
Second, there is curling, USB male seat and USB female seat more convenient when inserted.
Third, no curling in order to save space, but also to match the appearance of the shell panel.
The quality of a USB socket is a very important factor. What about the plating and selection of USB socket terminals?
The effect of selection of terminals is:
First, the drop strength: in the elastic range can have a large displacement.
Second, the stress relaxation: USB socket terminals for a long time when the force or use of high temperature, resist load capacity can still be maintained.
Third, the hardness: to reduce the metal socket terminal wear.
Fourth, scalability: to help shape the USB socket terminals.
V. Conductivity: Minimum material resistance.
USB socket terminal plating role
First, special surface properties: specifically include improving the electrical conductivity of the product, improving the reflectivity of light, reducing the contact resistance, and improving the solderability of the product.
Second, beautiful
Third, protection: extend the life of the product, the surface of the product coated with corrosion-resistant materials
Fourth, mechanical or engineering properties: improve the product's lubricity and product strength
The conductivity of pure copper terminals is relatively good, but its mechanical strength and heat resistance are only average. When pure copper adds alloy elements, the electron transport process is blocked or attenuated due to the difference in the atomic size. Phosphor bronze is also called phosphor bronze, which has strong antimony property and good elasticity. Too copper is a high-strength material, but its conductivity is deviated; beryllium copper has the characteristics of high strength, high elasticity, and high toughness, but the conductivity is deviated.