What are the basic properties of board-to-board connectors?

Basic properties of board-to-board connectors The basic properties of board-to-board connectors can be divided into three broad categories: namely, mechanical properties, electrical properties, and environmental properties.

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1. Mechanical properties In terms of connection functionality, the plug-in force is an important mechanical property. The insertion force is divided into insertion force and pull-out force (pull-out force is also called separation force), and the requirements of the two are different. The greater insertion force and minimum separation force are specified in the relevant standards, which indicates that the insertion force is small from the usage point of view (thus there is a structure with low insertion force LIF and no insertion force ZIF), while if the separation force is too small, it will affect the reliability of contact. Another important mechanical property is the mechanical life of the board-to-board connector. Mechanical life is actually a durability index, which is called mechanical operation in the national standard GB5095. It takes one plug-in and one pull-out as a cycle, and whether the connector can normally complete its connection function (such as contact resistance value) after the specified plug-in and pull-out cycle is used as the basis for judging. The insertion and removal force and mechanical life of board-to-board connector are related to the contact structure (positive pressure), the coating quality of contact parts (sliding friction coefficient) and the dimensional accuracy of contact arrangement (alignment). 2. Electrical properties mainly include contact resistance, insulation resistance, current and resistance. Contact resistance: High-quality electrical connectors should have low and stable contact resistance. The contact resistance of the connector varies from a few milliohms to tens of milliohms. Insulation resistance: An index that measures the insulation performance between contacts of electrical connectors and between contacts and housing. Its order of magnitude ranges from hundreds of megohms to thousands of megohms. Electrical strength or withstand voltage: characterizes the ability of connector contacts or between contacts and the housing to withstand the rated test voltage, depending on the gap between circuits (i.e. contact spacing and creepage distance) and the insulating material used in the connector.

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