Three characteristics of female rj45 connector

Three basic performances of female rj45 connector connectors The basic performances of connectors can be divided into three categories: The basic performances of connectors can be divided into three categories: mechanical performance, electrical performance and environmental performance. 1. Mechanical properties As far as the connection function is concerned, the insertion force is an important mechanical property. Insertion force is divided into insertion force and extraction force (extraction force is also called separation force), and the requirements of the two are different. There are regulations on the maximum insertion force and the minimum separation force in the relevant standards, which shows that from the perspective of use, the insertion force should be small (thereby there are structures with low insertion force LIF and no insertion force ZIF), and if the separation force is too small, It will affect the reliability of the contact. Another important mechanical property is the mechanical life of the connector. Mechanical life is actually a durability index, which is called mechanical operation in the national standard GB5095. It takes one insertion and one extraction as a cycle, and judges whether the connector can normally complete its connection function (such as contact resistance value) after the specified insertion and extraction cycle. The insertion force and mechanical life of the connector are related to the contact structure (positive pressure), the coating quality of the contact part (sliding friction coefficient) and the dimensional accuracy (alignment) of the contact arrangement. 2. Electrical properties The main electrical properties of the connector include contact resistance, insulation resistance and dielectric strength. ① Contact resistance High-quality electrical connectors should have low and stable contact resistance. The contact resistance of connectors varies from a few milliohms to tens of milliohms. ② Insulation resistance is an index to measure the insulation performance between the contacts of the electrical connector and between the contacts and the shell, and its order of magnitude ranges from hundreds of megohms to thousands of megohms. ③ Dielectric strength, or withstand voltage, medium withstand voltage, is the ability to characterize the rated test voltage between the contacts of the connector or between the contacts and the shell. ④ Other electrical properties. Electromagnetic interference leakage attenuation is to evaluate the electromagnetic interference shielding effect of the connector, and the electromagnetic interference leakage attenuation is to evaluate the electromagnetic interference shielding effect of the connector, generally tested in the frequency range of 100MHz~10GHz. For RF coaxial connectors, there are also electrical indicators such as characteristic impedance, insertion loss, reflection coefficient, and voltage standing wave ratio (VSWR). Due to the development of digital technology, in order to connect and transmit high-speed digital pulse signals, a new type of connector, that is, a high-speed signal connector, has emerged. Correspondingly, in terms of electrical performance, in addition to characteristic impedance, some new electrical indicators have also appeared. , such as crosstalk (crosstalk), transmission delay (delay), time lag (skew), etc. 3. Environmental performance Common environmental performance includes temperature resistance, humidity resistance, salt spray resistance, vibration and shock, etc. ① Temperature resistance At present, the maximum working temperature of the connector is 200°C (except for a few high-temperature special connectors), and the minimum temperature is -65°C. Since the current generates heat at the contact point when the connector is working, resulting in temperature rise, it is generally believed that the operating temperature should be equal to the sum of the ambient temperature and the temperature rise of the contact. In some specifications, the maximum
temperature rise allowed by the connector under the rated operating current is clearly specified. ② The intrusion of moisture resistance will affect the insulation performance of the connection h and corrode the metal parts. The constant damp heat test conditions are relative humidity 90%~95% (according to product specifications, up to 98%), temperature +40±20°C, and the test time is as specified by the product, at least 96 hours. The alternating damp heat test is more severe. ③ Salt spray resistance When the connector works in an environment containing moisture and salt, the surface treatment layer of its metal structure and contacts may produce galvanic corrosion, which will affect the physical and electrical properties of the connector. In order to evaluate the ability of electrical connectors to withstand this environment, a salt spray test is specified. It suspends the connector in a temperature-controlled test chamber, sprays it with a specified concentration of sodium chloride solution with compressed air to form a salt mist atmosphere, and its exposure time is specified by the product specification, which is at least 48 hours. ④ Vibration and shock resistance Vibration and shock are important properties of electrical connectors, especially important in special application environments such as aviation and aerospace, railway and road transportation, it is to test the robustness of the mechanical structure of the electrical connector and the reliability of electrical contact important indicator of sex. There are clear regulations in the relevant test methods. In the shock test, the peak acceleration, duration and shape of the shock pulse, as well as the time of interruption of electrical continuity shall be specified. ⑤ Other environmental properties According to the requirements of use, other environmental properties of electrical connectors include tightness (air leakage, liquid pressure), liquid immersion (resistance to specific liquids), low air pressure, etc.
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