Precautions for using USB connectors in extreme environments

When choosing usb connectors, there are many factors to consider, among which environmental parameters are one of the most important factors, including temperature, humidity, air pressure, etc. In different environmental conditions, the use of usb connectors is different. In different environmental conditions, the use of usb connectors are different, the following extreme environment of the use of skills.1. high temperature environment: usb connectors metal materials and insulation materials determine the connector's operating temperature. Used in high temperature environment will destroy the edge material, cause insulation resistance and voltage resistance is reduced, for the metal, high temperature can make the contact on the loss of elasticity, accelerate the oxidation and deterioration of plating. The usual ambient temperature of -40 ~ 80 ℃ special occasions may require more. 2. humid environment: relative humidity greater than 80%, is to cause electrical breakdown to cause. Used in a humid environment, will cause the absorption and diffusion of water vapor on the surface of the insulator, easy to reduce the insulation resistance to below the MΩ level, long-term use in a high humidity environment, it is easy to cause physical deformation, decomposition, escape generation, respiratory effects and electrolysis, corrosion and cracking. Especially in the equipment outside the usb connector, often have to consider the humidity, water seepage and pollution of the environmental conditions, this case should be selected sealed connector.3. Temperature rapid change of environment: humidity rapid change of test is to simulate the use of the usb connector in the cold environment into the warm environment of the actual use of the situation, or simulation of the space vehicles, detectors, rapid changes in ambient temperature situation. Rapid temperature change may make the insulation material cracks or layer. 4. thin air environment: in the thin air at high altitude, the plastic puts out gases to pollute the contact pairs, and make the corona tendency to increase, the voltage resistance decreases, so that the circuit produces a short-circuit failure. At high altitude to reach a certain value, plastic performance deterioration. Therefore, the use of non-sealed connectors in high altitude, must be derated. 5. corrosive environments: according to the usb connector used in different corrosive environments, the selection of the corresponding metal, plastic, plating structure of the connector, such as the use of the connector in the salt spray environment, if there is no corrosion-resistant metal surfaces, it will make the performance of a rapid deterioration. In the environment containing a considerable concentration of SO2, it is not advisable to use silver-plated contact pairs of connectors. Mold is also an important problem in hot and humid areas.

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