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March 2007

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Subject:
From:
"Upton, Shawn" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Upton, Shawn
Date:
Thu, 1 Mar 2007 09:03:20 -0500
Content-Type:
text/plain
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text/plain (118 lines)
Touche...

I try to build the prototypes of my boards, but some of the tiny parts
are just too small for me to deal with (small lead pitch, or MLP with
bottom side thermal pad).  Others, for low resistance, have minimal
thermal reliefs.  I can't solder them, the solder techs can, and at
least one assembly house said it wasn't a problem to solder them.  So,
sometimes the assembly person or house can do what I can't do.

Other times, I get told by my (internal) customer to move parts
bottomside, make the top side "look cleaner".  So the constraints aren't
always controlled by the layout guy.

Shawn Upton, KB1CKT
Test Engineer
Allegro MicroSystems, Inc
[log in to unmask]
603.626.2429/fax: 603.641.5336

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
Sent: Thursday, March 01, 2007 8:54 AM
To: [log in to unmask]
Subject: Re: [TN] Component Orientation Survey

"The
designs of today demand throwing away the constraints of the past."
because the designer in the past have to make the prototype by
themself...
get the today's designer to do the solder touch up rework on their
non-constraints design will fix it once for all...
                       jk

abcd

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Whittaker, Dewey
(EHCOE)
Sent: Thursday, March 01, 2007 8:47 AM
To: [log in to unmask]
Subject: Re: [TN] Component Orientation Survey


We gave the dream of orthogonal placement up a long time ago. The
designs of today demand throwing away the constraints of the past.
Listening to all the whining from our EMS providers has caused me to
reflect on that decision.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Green, Mike
Sent: Wednesday, February 28, 2007 6:59 PM
To: [log in to unmask]
Subject: [TN] Component Orientation Survey

When you design boards, do you:
-lay out similar polar components oriented in the same direction for
ease of manufacture regardless of the shortest routing or -lay out each
component oriented in the best position for routing regardless of the
orientation of other similar parts?

We have a difference of opinion as to which is more prevalent practice.


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