I have seen this before.  Try pulling the tape back by hand and watch closely. There may be enough static from the tape seperation to lift the part up and flip over. 
Charles Caswell

-----Original Message-----
From: Howard Watson [mailto:[log in to unmask]]
Sent: Wednesday, July 09, 2003 11:17 AM
To: [log in to unmask]
Subject: [TN] SOT 23 placed upside down



Dear Technet folks, 

I am obviously not following the search protocol properly for the information that I need, so I'll just post my Q's anyway.  First question relates to a problem I'm experiencing with some SOT 23's that get placed upside.  This occurs on multiple machines/feeders, and my hunch is that the component somehow is flipping upside down in the pockets while in the feeder.  Anyone have experience with this problem?  I did change the laser centering parameters so that it gets rejected now if it's upside down, but I'd like to figure out the root cause. 

My second question is regarding QFP components in trays or tape & reel - is there a standard or recommendation for putting fine pitch QFP's in trays verses tape & reel?  In other words, are 25 or 20 mil pitch gull wing QFP's OK to be supplied in tape & reel, or should they be in trays to avoid lead damage?  We always get these components in trays, and I figured it was to protect the leads, but now I wonder if tape & reel is fine.  I'm sure it depends somewhat on the feeders, and their ability to deliver the components without damaging the leads.  Any advice will be greatly appreciated. 

Howard Watson
SMT Manufacturing Engineer
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Grand Junction, CO


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