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Date: | Tue, 26 Nov 2013 14:14:05 +0000 |
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This is a discussion I have had with our designers when we should be using thermal reliefs for connections to ground planes. For low current it is a "don't care" but when we get into high current (>10A) the spokes should get larger and will essentially become no thermal relief. We use PADS PowerPCB and I believe it can handle the changes. Just getting folks to do it. (it is extra work... sigh)
But this is just my opinion,
Phil
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of grandrien
Sent: Monday, November 25, 2013 3:28 PM
To: [log in to unmask]
Subject: Re: [TN] PWB/PCB, clearance ring
Hi,
We use same clearance from pad outline whatever the hole diameter in middle. I don't see the reason for different values. Main reason for the copper clearance is the copper etching precision for pcb mfg, electrical isulation for PCBA reliability or assembly.
Rgds
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Message du 25/11/13 15:39
De : "Victor Hernandez"
A : [log in to unmask]
Copie à :
Objet : [TN] PWB/PCB, clearance ring
Fellow TechNetters:
Are all PWB/PCB internal clearance rings the same diameter or do the clearance ring diameter vary by drill hole size? How is the clearance ring diameter selected?
Victor,
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