Ahne, Apologize for using your post to make a comment to the originator. I must have deleted the message. How about using the pin 1 pad centroid of the device as a local fiducial? Assuming your software allows you to do this. Best regards, Gerry > Date: Thu, 17 Jul 2014 07:33:45 -0700 > From: [log in to unmask] > Subject: Re: [TN] Local Fiducials > To: [log in to unmask] > > With 0.4 mm pitch you have about 0.2 mm room between pads. To be sure the part is landing on the pads you probably want a placement precision of close to 20 um. Question 1: can your pick-and-placement machine meet that criteria (all day long) and question 2: are the pads where they are supposed to be with respect to the board or panel fiducials. > > Lots of opportunity for headaches especially when it comes to question #2! > > Ahne. > > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Bill Noel > Sent: Thursday, July 17, 2014 3:31 AM > To: [log in to unmask] > Subject: [TN] Local Fiducials > > Are local fiducials (those specifically associated with a single fine-pitch device) necessary anymore? I've been told by a rep from our Assy CM that they're not necessary anymore with the advent of high-tech pick and place machines. We've actually been designing some boards with .4mm pitch BGA's Does this fine of pitch still not require fiducials? Thanks in advance for the response. > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________