Reading Time: 5.8 Mins

Three basic properties of RF connectors

Interviews — 5 Min Read

Valerie Dicker Interview

1.Mechanical Performance

As far as the connection function is concerned, the insertion force is an important mechanical property. The insertion force is divided into the insertion force and the extraction force (the extraction force is also called the separation force), and the requirements of the two are different. In the relevant standards, there are provisions for the maximum insertion force and the minimum separation force, which means that from the point of view of use, the insertion force should be small (thereby a structure with low insertion force LIF and no insertion force ZIF), and if the separation force is too small, will affect the reliability of the contact.

Another important mechanical property is the mechanical life of the connector. Mechanical life is actually a durability indicator, 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 plug-in force and mechanical life of the connector are related to the contact structure (positive pressure), the coating quality (sliding friction coefficient) of the contact part, and the dimensional accuracy (alignment) of the contact arrangement.

2. Electrical Properties

The main electrical properties of connectors include contact resistance, insulation resistance and electric 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 It 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 several gigaohms.

③ Dielectric strength or withstand voltage, dielectric withstand voltage, is to characterize the ability of the connector to withstand the rated test voltage between the contacts or between the contacts and the shell.

④ Other electrical properties. The 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, which is generally tested in the frequency range of 100MHz~10GHz.

Aliquam maximus, nisi ut pretium luctus, magna turpis eleifend arcu, accumsan congue nibh urna sed ipsum. Mauris mattis non neque vel hendrerit. Cras gravida, velit vitae semper aliquet, metus tellus eleifend odio, ut facilisis risus sapien.

Quisque imperdiet erat eget elit varius varius. In nec dui lobortis, accumsan eros et, tempus mauris. Nunc vestibulum ligula a ultrices imperdiet. Fusce at orci molestie erat euismod ultricies et eu erat. Aenean vulputate erat id dui dapibus, vitae iaculis felis vulputate. Quisque volutpat porttitor leo vitae pretium. Maecenas fringilla urna vitae porta commodo. Sed sit amet nisl accumsan, dictum erat in, vestibulum dolor. Donec maximus hendrerit urna. Morbi dictum tristique purus.

3. Environmental performance

Common environmental properties include temperature, humidity, salt spray, vibration and shock.

① Temperature resistance At present, the maximum working temperature of rectangular connectors is 140°C (except for a few high-temperature special connectors), and the minimum temperature is -45°C. Since the current generates heat at the contact point when the connector is working, resulting in a 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 point. In some specifications, the maximum temperature rise allowed by the connector at the rated operating current is clearly specified.

②The intrusion of moisture resistance will affect the insulation performance of the connection and corrode metal parts. The constant damp heat test conditions are relative humidity 90%~95% (according to product specifications, up to 98%), temperature +40±20℃, and the test time is at least 96 hours according to product regulations. The alternating damp heat test is more severe.

③ When the salt spray-resistant connector works in an environment containing moisture and salt, its metal structural parts and the surface treatment layer of the contact parts may cause galvanic corrosion, which affects the physical and electrical properties of the connector. To evaluate the ability of electrical connectors to withstand this environment, the salt spray test is specified. It is to hang the connector in a temperature-controlled test box, and spray the sodium chloride solution with the specified concentration with compressed air to form a salt fog atmosphere. The exposure time is specified by the product specification, at least 48 hours.

④ Vibration and shock Vibration and shock resistance are important properties of electrical connectors, especially important in special application environments such as aviation and aerospace, railway and road transportation. important indicator of sexuality. There are clear provisions in the relevant test methods. The shock test shall specify the peak acceleration, duration and shock pulse shape, as well as the time of interruption of electrical continuity.

⑤ Other environmental properties According to the requirements of use, other environmental properties of electrical connectors include sealing (air leakage, liquid pressure), liquid immersion (the ability to resist deterioration of specific liquids), low air pressure, etc.

Stay Up To Date With Our Latest Products

We will process the personal data you have supplied in accordance with our privacy policy.