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Pins too tight

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budnoel View Drop Down
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    Posted: 12 Nov 2012 at 12:47pm
uploads/45/Connector.jpg
 
Hello. Using IPC density level C (Least) for the padstacks associated with pins 13-16 of the enclosed connector footprint I find less the 5mils of clearance between pads. (4.8mils)  I had to make the pad even smaller than what Level C recommended (c140h90)  Any comments?
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DaveCowl View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DaveCowl Quote  Post ReplyReply Direct Link To This Post Posted: 12 Nov 2012 at 5:02pm
You are not alone. I have a similar issue with a mini DisplayPort connector. You can't space 1mm pads 1mm apart. I don't have a good answer for this problem but think that pad clearance is probably more important than annular ring...?!
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Tom H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 13 Nov 2012 at 7:45am
Whenever the pin pitch and the hole size conflict with the design rules, I use an oblong pad shape with a minimum pad on the sides and accept drill breakout on the sides (if it happens).
 
I never had any manufacturing problems when using this technique. Sometimes you have to think outside the box. We'll have to introduce this pad shape to the through-hole calculator in V2013.
 
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