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I have a 2.2 amp signal that needs to enter a backplane connector, but due to pin spacing and pad dimensions, I am unable to route a 60 mil trace.(pins are at 100 mil spacing with 40 mil pads, which leaves max trace thickness of 20 mil in between pins)Should I neck the trace down, or should I break the trace down to two samller traces entering the pad.Any help would be appreciated.
I'm not a layout person but if someone has decided that you need a 60mil wide trace, do not neck down.Split the trace up into several paths whose width total is as close to 60 mils as you can get. Why not use 4 20mil wide traces in the pin field that meet at the pin(s)?
I would suggest using a cooper shape to flood thru the connector pin field to make the connection. It is much easier than dealing with multiple traces. These shapes should be on the surface of the PCB so they carry the most current. One thing to note, if the backplane connector is not Press Fit then you will need a thermal relief on the pins that connect to the cooper shape.Hope this helps,Mike CatramboneUTStarcom, Inc.
I appreciate the replies, Great suggestions.Mike, one of the problems with running a copper pour is that I have multiple 2.2 a signals on adjacent pin pairs. Plus I have to run them as diff pairs. Its a signal and its return path. So it looks like multiple traces it is. Should these be run on different layers ? Same Layer? Can I run one single 60 mil trace and then break it down to three individual 30 mil traces only where I need to?Thanks for all your time and helping me learn.