Hi Don,

 

My understanding of “supported” and “unsupported” holes is that they are both PTH, but “supported” holes will have a pin inserted through them and soldered.  An example of an “unsupported” hole would be a through via.  The term “supported” and “unsupported” is used for Z-axis calculation of CTE to eliminate barrel cracking, I believe!

 

Respectfully,

 

Steven D. Roy

PCB Designer

Audio Authority Corp.

2048 Mercer Road

Lexington, KY  40511-1071

(859) 233-4599 X-159

[log in to unmask]

 

-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Don Larisey
Sent: Tuesday, August 12, 2008 11:39 AM
To: [log in to unmask]
Subject: IPC-2221

 

 

In IPC-2221 it specifies some holes as “Supported” and “Unsupported” and I used to know what the difference is but I don’t remember. Would someone please give the explanation?

 

Don

 

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