Advice sought for holes close on Mini DisplayPort

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I have a sticky issue for a Mini DisplayPort connector with through hole pins.

The holes are recommended at 0.6mm but there are holes only 1mm apart!

So, in order to maintain a clearance of say 0.15mm between pads I get 0.85mm diameter pad (compared to recommended pad of 1.1mm for 0.6mm hole).

So, the question is, which 'rules' are best to follow.

I am inclined towards maintaining the pad to pad spacing and having a tight annular ring, rather than compromise pad to pad spacing for a larger ring and risk bridging.

Any guidance on this appreciated.

Cheers!

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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 Topic: Advice sought for holes close on Mini DisplayPort Posted: 08 Nov 2012 at 4:33pm
	I have a sticky issue for a Mini DisplayPort connector with through hole pins. The holes are recommended at 0.6mm but there are holes only 1mm apart! So, in order to maintain a clearance of say 0.15mm between pads I get 0.85mm diameter pad (compared to recommended pad of 1.1mm for 0.6mm hole). So, the question is, which 'rules' are best to follow. I am inclined towards maintaining the pad to pad spacing and having a tight annular ring, rather than compromise pad to pad spacing for a larger ring and risk bridging. Any guidance on this appreciated. Cheers!



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: 08 Nov 2012 at 4:57pm
	It looks like the pins are rectangular, max 0.25mm wide, so maybe I can also shrink the hole from 0.6mm to .55 or even 0.5mm...?

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: 5752	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 08 Nov 2012 at 5:39pm
	A 0.25 mm square pin size could fit easily into a 0.55 mm hole, but still that's a 0.95 mm pad per Proportional Padstack. Download the IPC-7351 Padstack Calculator - http://www.pcblibraries.com/forum/ipc7251-pth-padstack-calculator_topic596.html It has Least, Nominal & Most environment padstack calculations. Great resource tool for when you're in a jam.