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March 2000

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Subject:
From:
Phil Nutting <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 17 Mar 2000 08:17:33 -0500
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Dennis,

From one of the old guys from when the 741 Op-Amp was a new marvelous
invention.

If your talking about through hole boards, then putting all the components
on the "top" side is the most cost effective.

If your talking surface mount, then it is just a matter of the added steps
to place components on the top and bottom and then reflow the solder.

Regards, Phil Nutting

-----Original Message-----
From: Dennis Ward [mailto:[log in to unmask]]
Sent: Friday, March 17, 2000 6:54 AM
To: [log in to unmask]
Subject: [TN] One side vs Both side


Good morning everyone,

Question for all you manufacturing gurus. Is there a
significant advantage, cost wise, to keeping all the components
on the top side of the board versus placing components
on both sides?

Now I do know that they are some NRE cost, but is it
significant? In the past I was taught you should try to
keep every thing on top. But it seems that high density
double side boards are very common. There doesn't
seem to be as much emphasize on consolidating all
the components on the top side.

As an example if you quoted two boards - all things
being equal except that one was populated on the
top and the second board was populated on both
sides what would be the cost difference (if any)?

The reason I ask is that I am laying out a board
that I may be able to squeeze everything on top.
However I'm tempted to just throw discretes on the
bottom of the board. The engineer asked what was
I going to do. I told him that I'd try to keep everything
on top. He then asked "why"? I answered it would be
easier to manufacture, inspect, debug, eliminate some
manufacturing steps and eliminate some cost. But I
started thinking and wondered if my thinking was backwards
and these concerns are negated with the advance of
technology.

Anyway, any advice would be greatly appreciated. Also
I would like to take a moment and thank everyone for
their particpation on this forum. It has proved extremely useful
for me personally. Enough so that a few strings of humor well
not affect my judgement as to the value of this forum. Actually
I enjoy hearing some of the "old timers" discuss the days of tape
and exact-o knives - personally never had the pleasure.

Thanks
Dennis Ward
Net to Net Technologies, Inc.
603 427-0600
[log in to unmask]
http://www.nettonettech.com

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