Hi,

 Suggestion:

 Do not think of a "Marked End" as pin 1. Very often a marked end and pin 1
are very different.

 If you think of "Orientation Marks" only then you can completely forget
about pin numbers.

 I have seen so many folks try to setup diodes so the cathode is pin 1 is
the mark, it is a loosing battle. Stick with Orientation Mark and life is
simpler.

Bob Kondner

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gumpert, Ben
Sent: Wednesday, July 07, 2010 6:55 AM
To: [log in to unmask]
Subject: Re: [TN] QFN pads design-QPI-3

GA Tan,

I'd guess that Pin 1 is shaped that way to indicate that it is Pin 1, and
Pins 5 and 6 to indicate that they are ground. Although Pin 1 is often a
different shape, I have not seen ground pins shaped differently before.

Ben

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tan Geok Ang
Sent: Tuesday, July 06, 2010 7:57 PM
To: [log in to unmask]
Subject: EXTERNAL: [TN] QFN pads design-QPI-3

Hi all,
         I will like to learn and know why is the component (QPI-3)
terminals designed in the way for pin #1, pin#5 and pin#6, any special
reason?

	
http://cdn.vicorpower.com/documents/datasheets/Picor/ds_qpi3L.pdf


Thanks in advance.

Regards
GA Tan

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