How do you make a selection for board-to-board connectors?

I. Board to board connector how to select it?1, pin, pitch pin number, pin pitch is the basic basis for connector selection. Select how many pins of the connector depends on the number of signals to be connected. For some SMD connectors, such as the following picture of the SMD row of pins, the number of pins should not be too many. Because in the bonder welding process, due to the role of high temperature, the connector plastic will be heat deformation, the middle bulge, resulting in pin welding. 2, the electrical properties of the connector's electrical properties mainly include: limit current, contact resistance, insulation resistance and resistance to electric strength, etc. When connecting high-power power supply, you need to pay attention to the connector. Connection of high-power power supply, need to pay attention to the limit current of the connector; transmission of high-frequency signals such as LVDS, PCIe and other signals, need to pay attention to the contact resistance. Connector should have a low and constant contact resistance, generally tens of mΩ to hundreds of mΩ. 3, environmental performance connector environmental performance mainly includes: temperature, humidity, salt spray, vibration, shock and so on. Selected according to the specific application environment. If the application environment is more humid, the connector for the humidity, salt spray resistance requirements are high, to avoid the connector's metal contacts are corroded. In the field of industrial control, the connector vibration shock performance requirements are high, so as to avoid the connector in the vibration process to fall off. 4, the mechanical properties of the connector mechanical properties, including the pull-out force, the mechanical anti-dumbness, etc.. Mechanical dummy connector is very important, once inserted in reverse, it is likely to cause irreversible damage to the circuit! Unplugging force is divided into insertion force and separation force. Relevant standards have a greater insertion force and minimum separation force, from the use of point of view, the insertion force should be small, separation force should be large. Separation force is too small will reduce the reliability of the contact, however, for the frequent need to insert and remove the connector, the separation force is too large will increase the difficulty of pulling out, reduce mechanical life.

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