How to select board-to-board connectors?

I. How to select board-to-board connectors? It is very important for users to choose board-to-board connector products correctly. So, how to choose board-to-board connectors and what are the selection criteria? In recent years, board-to-board connectors are moving towards a smaller trend. The most common board-to-board connector pitch for handheld consumer electronic devices is 0.40 mm; while 1.00 mm stack height belongs to the small connectors, recently major OEMs are using connectors as low as 0.70 mm, sometimes even lower. Older miniature connectors that were wider than 4.00 mm a few years ago were replaced by connectors in the 3.40 mm width range, and current "narrow body" board-to-board concepts are typically in the 2.40 to 2.60 mm range. Is it true that the smaller the board-to-board product, the better? When sourcing board-to-board connectors, there are a few things to consider beyond the basics of circuit size, stacking height and width: Is smaller really better? If you're willing to accept a smaller vacuum port pickup area, you're probably right. Before choosing a subminiature connector, you need to check that it has all the other properties you need and test it carefully to make sure it is robust enough. It would then seem necessary to go for a socket with a top-mounted connector, as this setup would enable tracking to be run underneath the socket, and would probably facilitate the use of conformal coating. Some of the disadvantages of top-mounted receptacles are that the width of the vacuum pickup area tends to be narrower, there is no plastic shell material above the receptacle terminals to prevent rise in the event of a rough disconnect action, and the more uneven top surface of the receptacle may create problems for the operator's connecting operations. These new connectors with stronger disconnects sound great! Yes, but you may need to tolerate the extra connector length in order to achieve the locking function required for these connectors; greater disconnect strength usually means greater joining strength, which may also cause problems for larger circuits.

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