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Let's talk about the mechanical and electrical properties of the connector

Author: Date:10/23/2019 12:01:03 AM
    Because there is a "classification of connector performance" in the connector field and a basic performance check of each element after the connector performance classification. It can accurately grasp the basic performance of each element of the connector, so a correct understanding of this knowledge will help the majority of connectors to use the customer to correctly master and use their own electronic products.


 

    In the above, we know that the basic performance of the connector can be divided into mechanical, electrical and environmental performance. Now we will deeply understand the mechanical and electrical properties in the basic performance classification of the connector.

 

    Mechanical properties of the connector In terms of the connection function, the mechanical properties are the mechanical life of the connector product. Mechanical life is actually an indicator of durability, which is called mechanical operation in GB5095.

 

    It is a cycle of one insertion and one extraction, so as to judge whether the connector can complete its connection function normally after the specified insertion cycle. In addition, the insertion force is an important mechanical property, and the insertion force is divided into an insertion force and an extraction force (the extraction force is also called a separation force), and the requirements of the two are different.

 

    There are maximum insertion force and minimum separation force regulations in the relevant standards, which means that the insertion force is small from the point of view of use (thereby having a low insertion force LIF and a structure without ZIF insertion), and if the separation force is too small, This will affect the reliability of the connector contact.

 

    The insertion force and mechanical life of the connector are related to the plating quality (sliding friction coefficient) of the contact structure (positive pressure) contact portion and the dimensional accuracy (alignment) of the contact arrangement.

 

    For the electrical performance of the connector, the electrical properties of the connector mainly include contact resistance, insulation resistance and electrical strength. The electrical properties of the connector are as follows:

 

First, the contact resistance high quality electrical connector should have a low and stable contact resistance, the contact resistance of the connector varies from a few milliohms to tens of milliohms.

 

    Second, the insulation resistance measures the insulation performance between the contacts of the electrical connector and between the contact and the outer casing, the order of magnitude ranging from hundreds of megaohms to several gigaohms.

 

    Third, the electrical strength or the withstand voltage, dielectric withstand voltage, is to characterize the ability to withstand the rated test voltage between the connector contacts or between the contact and the casing.

 

4. For the electrical performance of the connector, the electromagnetic interference leakage attenuation is to evaluate the electromagnetic interference shielding effect of the connector. The electromagnetic interference leakage attenuation is to evaluate the electromagnetic interference shielding effect of the connector, and is generally tested in the frequency range of 100 MHz to 10 GHz.

 

    For other connectors, such as RF coaxial connectors, there are 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, namely high-speed signal connector, has appeared. Correspondingly, in addition to characteristic impedance, some new electrical indicators have appeared in electrical performance. Such as crosstalk, delay, skew, etc.