PCB Connector of the Three Basic Performances
The basic performance of PCB connectors can be divided into three categories, mechanical behavior, electrical performance and environmental performance.
Mechanical properties
In terms of connection function, the insertion force is an important mechanical property.
Insertion force is divided into insertion force and pull out force (pull force also known as separation force), the two requirements are different. In the relevant standards have the maximum insertion force and the minimum separation force of the provisions. This indicates that, from the point of view of use, the insertion force have to be small and the separation force is too small to affect the reliability of the contact.
Another important mechanical property is the mechanical life of the PCB connector. Mechanical life is actually a durable indicator, in the national standard GB5095 it is called mechanical operation. It is inserted once and once for a cycle. To the specified plug-in cycle, the PCB connector can normally complete the connection function (such as contact resistance) as a basis for judging.
PCB connector insertion and tear force and mechanical life is related to the contact structure, the contact part of the coating quality and contact arrangement size accuracy.
Electrical performance
The electrical performance of the PCB connector includes contact resistance, insulation resistance and electrical strength.
① contact resistance
High-quality PCB connectors should have low and stable contact resistance. The PCB connector has a contact resistance ranging from a few milliohms to several tens of milliohms.
② insulation resistance
Measure the insulation performance between the PCB connector contacts and the contact between the contact and the enclosure, which is of the order of several hundred megohms to several gigahertz.
③ resistance to electrical strength or resistance to voltage, medium pressure,
It means the ability to withstand the rated test voltage between the PCB connector contacts or between the contacts and the enclosure.
④ other electrical performance.
Electromagnetic interference leakage attenuation is to evaluate the PCB connector electromagnetic interference shielding effect, generally testing in the range of 100MHz ~ 10GHz frequency.
For RF coaxial PCB connectors, there are characteristic impedance, insertion loss, reflection coefficient, voltage standing wave ratio (VSWR) and other electrical indicators. As a result of the development of digital technology, in order to connect and transmit high-speed digital pulse signal, there has been a new type of PCB connector that is high-speed signal PCB connector. Correspondingly, there are some new electrical indicators, such as crosstalk, delay, skew, and so on, in addition to the characteristic impedance in terms of electrical performance.
