Hi Gaby

As Russ states IPC 7525 is a good reference for stencil aperture design.  Revision A of this document is being released at APEX this month.  It has been updated to deal with Lead-free among other things.  I have attached a design help tool for Aperture Design and Stencil Selection (Area Ratio Calculator).  This tool can also be seen at the Innovative Technology Center at APEX in LA.

Regards,



-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Gabriela Bogdan
Sent: Thursday, February 15, 2007 8:19 AM
To: [log in to unmask]
Subject: [TN] stencil apertures


Dear all,

Could you tell me if there is a standard for stencil apertures CORNER RADIUS?
I look for indications or requirements coming from people with hands on experience regarding differences between the manufacturability of stencils with all methods (etching, laser, electroforming) as well as best solder paste release quality.
I am also interested in aperture optimization for lead free pastes. 

Gaby

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