RE: [TN] FPBGA Area Ratio Question
IPC folks, can you jump in on this one? Is the formula for area ratio correct in IPC-7525?? Should the numerator be "area of pad" or "area of aperture"?
 
Thanks.
 

Bob

=======================
Robert Barr
Manufacturing Engineering
Formation, Inc.
Voice: 856-234-5020 x3035
Fax: 856-234-6679

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Becerra Alejandro
Sent: Wednesday, May 29, 2002 5:01 PM
To: [log in to unmask]
Subject: Re: [TN] FPBGA Area Ratio Question

As far as I know, the calculation is using the aperture area and not the pad area, because the area ratio is a calculation for the stencil that
affects the paste release.
 
Alejandro