How to choose the size of the board-to-board connector?

　　In recent years, the development trend of board-to-board connectors has become smaller and smaller. The spacing between board-to-board connectors usually used for handheld consumer electronic devices is 0.40 mm; while the stack height of 1.00 mm is a small connector, and the connector spacing used by major original equipment manufacturers is 0.70 mm. Sometimes even smaller.

　　A few years ago, the old miniature connector, whose width exceeded 4.00 mm, has now been replaced by a connector with a width of 3.40 mm, and the concept of a "narrow body" to the board is usually between 2.40 and 2.60 mm. But, is the smaller the better? In the process of choosing a connector, in addition to some basic issues, such as circuit size, stack height, width, etc., there are several points to consider:

　　Small size is better, right? You may be right if you want a smaller vacuum port pickup area. Before choosing an ultra-small connector, you must check whether the connector has all the other properties you need, and carefully test it to ensure its strength and durability.

　　Then, it seems necessary to choose a socket with a top-mounted connector, because the setup can run tracking under the socket and may be easy to use conformal coating. Some disadvantages of overhead sockets are that the vacuum socket at the plug end of the vacuum socket is usually narrow. There is no plastic shell material to prevent the rise caused by rough disconnection, and the top surface of the socket is relatively uneven, which may give the operator continuous Operation brings trouble.

　　The new connector sounds good, and the disconnection is more powerful! Yes, but you may need to tolerate too long connectors in order to achieve the locking function required by those connectors. The greater the disconnection force, the greater the connection force, which may also give the larger size. The circuit caused the problem.

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