The basic properties of PCB connectors can be divided into three categories: namely, mechanical properties, electrical properties , and environmental performance.
1 Mechanical properties on connectivity , the insertion force is important to mechanical properties. Insertion force insertion and extraction force is divided into ( pull force known as separation force ) , the two requirements are different. There are in the standard minimum and maximum insertion force required separation force , which indicates that , from the use point of view , smaller insertion force ( LIF to have low insertion force and the insertion force ZIF no structure ) , while if the separation force is too small , it will affect the contact reliability .
Another important mechanical properties are the mechanical life of the connector PCB . Mechanical life is actually a durability (durability) indicators in the national standard GB5095 call it mechanical operation . It is the first time you insert and pull out of a cycle to cycle after a specified PCB plug connector can normally complete its connectivity features ( such as contact resistance value ) as the basis for evaluation .
PCB connector insertion force and mechanical life with the contact structure ( positive pressure size ) contact area coating quality ( coefficient of sliding friction ) as well as contacts arranged dimensional accuracy ( degree of alignment ) related.
2 main electrical performance electrical properties , including PCB connector contact resistance , insulation resistance and dielectric strength .
① high-quality electrical contact resistance PCB connector should have a low and stable contact resistance . PCB connector contact resistance from a few milliohms to tens of milliohms range.
② measure insulation resistance between the insulation performance indicators PCB electrical connector contacts and the contact member and the housing , on the order of hundreds to thousands of megohms megohm range.
③ said dielectric strength or resistance, voltage, medium voltage, tolerance is the ability to characterize PCB connector between contacts or contacts with the housing rated test voltage .
④ other electrical properties.
EMI leakage attenuation evaluation PCB connector electromagnetic interference shielding effect , the leakage of electromagnetic interference attenuation evaluation PCB connector electromagnetic interference shielding effect , generally in the 100MHz ~ 10GHz frequency range tested.
RF coaxial connector on the PCB is 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 , There was a new type PCB connector which high-speed signal PCB, accordingly, the electrical properties , in addition to the characteristic impedance , but also the emergence of some new electrical indicators, such as crosstalk (crosstalk), propagation delay (delay), time delay (skew) and so on .
