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Advice sought for holes close on Mini DisplayPort

Printed From: PCB Libraries Forum
Category: Libraries
Forum Name: Footprints / Land Patterns
Forum Description: [General or a CAD specific issues / discussions]
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=670
Printed Date: 22 Nov 2024 at 2:43am


Topic: Advice sought for holes close on Mini DisplayPort
Posted By: DaveCowl
Subject: Advice sought for holes close on Mini DisplayPort
Date 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!


Replies:
Posted By: DaveCowl
Date 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...?

Posted By: Tom H
Date 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" rel="nofollow - 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.
 


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