Pins too tight

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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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budnoel Members Profile Send Private Message Find Members Posts Add to Buddy List Active User Joined: 16 Mar 2012 Status: Offline Points: 17	Post Options Post Reply Quote budnoel Report Post Thanks(0) Quote Reply Topic: Pins too tight 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?



DaveCowl Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 18 Oct 2012 Location: Santa Clara, CA Status: Offline Points: 161	Post Options Post Reply Quote DaveCowl Report Post Thanks(0) Quote Reply 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...?!

Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5719	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply 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.