The basic properties of the terminals of the connector

 

The basic properties of the connector terminals can be divided into three categories: the mechanical properties, electrical properties and environmental performance. Another important mechanical properties are the mechanical life of the connector. Mechanical life is actually a durability (durability) indicators. It is once engaged, is separated into a loop, to engage in a predetermined, after the separation loop connector terminals can normally complete its connectivity (e.g., contact resistance value) as the basis for evaluation. Terminals Terminals

 

Terminals

  1. Mechanical properties on connectivity, the insertion force is important to the mechanical properties. Plug into force insertion force and withdrawal force (pull force known as separation force), both requirements are different. There are standards in the maximum insertion force and a predetermined minimum separation force, which indicates that, from the use point of view, smaller insertion force (LIF thereby low insertion force and insertion force ZIF no structure), while if the separation force is too small, it will affect the contact reliability. Connector insertion force and mechanical life contact structure (positive pressure size) contacting the coating quality parts (sliding friction coefficient) and the dimensional accuracy of contact arrangement (aligned degrees) related.

     

2. The main electrical performance electrical performance of the connector terminals include contact resistance, insulation resistance and dielectric strength.


① contact resistance of high-quality electrical connectors should have a low and stable contact resistance. Connector contact resistance from a few cents to tens milliohms range.


② measure the insulation resistance of the insulation performance metrics between the electrical connector contacts and the contact member and the housing, of the order of several hundred to several thousand megohms megohm range.


③ said dielectric strength or resistance, voltage, medium voltage, tolerance is the ability to characterize the connector between contacts or contacts with the housing rated test voltage.


④ other electrical properties.
EMI leakage attenuation of electromagnetic interference shielding effectiveness evaluation connector, EMI leakage attenuation of electromagnetic interference shielding effectiveness evaluation connector, generally in the frequency range of 100MHz ~ 10GHz test.


RF coaxial connector terminals concerned, there is the characteristic impedance, insertion loss, reflection coefficient, voltage standing wave ratio (VSWR) and other electrical indicators. Due to the development of digital technology, in order to connect and transmit high-speed digital pulse signal, the emergence of a new type of connector that is high-speed signal connectors, accordingly, the electrical properties, in addition to the characteristic impedance, but also there are some new electrical indicators such as crosstalk (crosstalk), propagation delay (delay), Delay (skew) and the like.


3. Common environmental performance environmental performance including temperature, humidity, salt spray, vibration and shock.


① temperature currently connector maximum operating temperature of 200 ℃ (except a few special high-temperature connector), the lowest temperature of -65 ℃.

 

 

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