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Timeline for Tolerance of board-to-board headers

Current License: CC BY-SA 4.0

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Feb 12 at 15:36 comment added Fredled Yes, holes diameters are always a little bit larger to be able to insert the THT component easily. If it's too tight it may become too difficult. I believe hole diameter given in the datasheets (and hopefully in the libraries) take tolerance in account. The "standard" 2.54 header can tolerate quite a good margin. If you have a lot of headers, bigger problem than tolerance is to insert all the pin into all the sockets at once. Standard 2.54 headers are not sturdy enough and some pins can miss their mating as they are pushed aside. Connector with a box to guide the pins will help.
Feb 12 at 10:15 comment added Eng Sam i think you didnot understood the problem. "their should be no matching issue, no matter the type of connector." I have a problem with this sentence. for example a standard 2.54mm header with square pins has hole diameter of 0.9mm ( in most pcb libraries) when you place the connector in real life you can jiggle the connector , this is intentional to allow the component to be inserted (unlike fit and press type of connectors). Now this play / tolerance will make each board slightly different from other board . and this is the issue i am talking about , not placing in pcb software. regards
Feb 10 at 18:33 history answered Fredled CC BY-SA 4.0