USB connector development should be miniaturized, high density, high-speed transmission, high-frequency direction. Miniaturization refers to the connector center spacing is smaller, high density is to achieve large core number.

High-density PCB (printed circuit board) connector The total number of effective contacts up to 600 core, dedicated devices up to 5000 core. High-speed transmission refers to the modern computer, information technology and network technology requirements signal transmission time scale rate of up to MHz band, pulse time to sub-milliseconds, so require a high-speed transmission connector. High frequency is to adapt to the development of millimeter-wave technology, RF coaxial connectors have entered the millimeter-wave operating frequency band.

In the choice of usb connector, the need to consider a lot of factors, including environmental parameters is one of the most important factors, including temperature, humidity, pressure and so on. In different environmental conditions, usb connector to use different methods, the following gives you some extreme use of the environment skills.

1, high temperature environment

The metal material and insulation of the usb connector determine the operating ambient temperature of the connector. High temperature will destroy the edge of the material, causing insulation resistance and pressure resistance is reduced; for high temperature metal can make contact to the loss of elasticity, accelerated oxidation and the occurrence of coating deterioration. The usual ambient temperature is -40 ~ 80 ℃ special occasions may require higher.

2, humid environment

Relative humidity greater than 80%, is caused by electric breakdown of the reasons. Humid environment caused by the absorption and diffusion of water vapor on the surface of the insulator, easy to reduce the insulation resistance below MΩ, long-term high humidity environment, will cause physical deformation, decomposition, escape products, produce respiratory effects and electrolysis, corrosion And crack. Especially in the external parts of the device, often have to consider the wet, water infiltration and pollution of environmental conditions, in which case should use sealed connector.

3, the temperature of the environment

The humidity abrupt change test simulates the actual use of the usb connector in a warm environment into a warm environment, or simulates a dramatic change in the ambient temperature of the spacecraft and detector. A sudden change in temperature may cause cracks or layers of insulating material.

4, air thin environment

In the air at a high altitude, plastic emissions of gas pollution contact, and to increase the trend of corona, pressure performance decreased, so that the circuit short circuit failure. At high altitude to achieve a certain value, the plastic performance deteriorated. Therefore, the use of non-sealed connector at high altitude, must be derated.

5, corrosive environment

According to the usb connector used in different use of corrosive environment, the choice of the corresponding metal, plastic, coating structure of the connector, such as salt spray environment in the use of the connector, if there is no corrosion of the metal surface, will deteriorate the performance quickly. In a SO2 environment with a considerable concentration, it is not advisable to use silver-plated contacts. In hot flashes, mold is also an important issue