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.

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