Ioan,

 

Definition of a Polarized Component:

 

  A component with an orientation indicator.

 

I would suggest that a DPAK cannot reasonable be oriented incorrectly as
there is no rotational position that matches leads to land patterns.  After
writing loads of software that deals with component orientation logic I have
decided:

 

Forget about Cathodes, Anodes, Pin 1 and all such rubbish. Only one concept
is required and that is an "Orientation Mark". 

 

The "Opportunity" I see is for the correct alignment of a part orientation
mark to the PCB orientation mark and that is hit or miss. So I see only 1
opportunity. Though, I can see parts without an orientation being "Easier"
to get right which implies another set of issues. 

 

One interesting question is how does one weigh the "Defect" of getting a
reel loaded incorrectly? That one error propagates into a huge number of
secondary defects. Are 1000 boards each with 10 diodes positioned
incorrectly a single reel loading defect or 10,000 placement defects?  :-(

 

Bob K.

 

 

 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
Sent: Wednesday, March 07, 2012 3:17 PM
To: [log in to unmask]
Subject: [TN] Polarity of electronic components

 

Dear Technos,

 

 

For DPMO purposes, how do you define polarized components? And I mean beyond
diodes, tantalum caps and ICs, for instance connectors or DPAKs.
Hypothetically one can mount a DPAK at 90, 180 or 270 degrees. It is
obvious, easy to see if this part, or an RJ connector is mounted in a
different position than required, but are they considered polarized parts
when doing the opportunities count?

 

 

Thanks,

 

 

Ioan Tempea, ing.

Ingénieur Principal de Fabrication / Senior Manufacturing Engineer T |
450.967.7100 ext.244 E |  <mailto:[log in to unmask]> [log in to unmask] <
<mailto:[log in to unmask]> mailto:[log in to unmask]> W |
<http://www.digico.cc> www.digico.cc < <http://www.digico.cc/>
http://www.digico.cc/> 

 

 N'imprimer que si nécessaire - Print only if you must

 

 

 

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