Hi Kirk Kirk Wallace wrote:
>I am trying to layout my serial DAC board. So far, I have used SMT for >everything, but I am down to the terminal blocks. I like these: > >http://rocky.digikey.com/WebLib/Phoenix/Web%20Data/1725656.pdf > > Those terminal blocks are good, but I don't think you'll find good ones in SMT packages. The reason is that the through holes are needed for mechanical reasons - you'd rip SMT pads off the PCB with too connector many mating cycles. I'm pretty sure I have seen SMT connectors like this before, but they still have pins that go through the board. >but of course they are through hole connectors. Does anyone know of a >good SMT connector? On the other hand, do holes cost much when having >boards professionally made? I will, at least, have four mounting holes, >but I can do those myself. > > Holes are essentially free when getting the PCB made. If you have more than 50 or 100 holes per square inch they may charge you more, but as long as you stick to the standard drill sizes, there shouldn't be a charge for a few holes (even with non-standard drills, the charge is usually a few $ per additional drill size, not per hole). Where you run into extra expense is if you get the boards assembled. Adding through-hole parts means that the boards need to go through an extra process - wave solder / cleaning. It may also change the SMT process - adding glue for example, so SMT parts aren't washed away in the wave solder machine. I'd go with through-hole parts. - Steve ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
