12oz???  Wowzer...

Related question: on these thick copper boards, I presume larger holes are recommended, if one is stitching layers together.  What kind of aspect ratio is recommended, in order to get thicker buildup in the holes?

Shawn Upton, KB1CKT
Test Engineer
Allegro MicroSystems, Inc
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603.626.2429/fax: 603.641.5336


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Nutting, Phil
Sent: Thursday, February 28, 2013 4:42 PM
To: [log in to unmask]
Subject: Re: [TN] Notes in PCB Fabrication

Scott, 

Good points.  There is one thing I might add relative to current carrying.  If you plan to have high current with 2, 3, 4 or more ounce copper you will want to plate more copper onto the board surface to get thicker copper plated into the holes.  Do not depend on 1/2 ounce copper plated into the holes for high current applications.  Our vendors typically will plate 1 to 2 ounces on our heavier weight boards.  A 12 ounce board is not uncommon for some of our power converter boards.

Phil

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