According to Coombs' Printed Circuits Handbook, 4ed., "...there is almost a
linear relationship between board cost and layer count." (sec 1.6.4.,
p.1.19).
You might also check out chapter 7 of the same reference.
And, for what it's worth TMRC '96, says the avg. multilayer PWB was $18.20.
J.Felts
-----Original Message-----
From: Olson, Jack C [SMTP:[log in to unmask]]
Sent: Thursday, May 14, 1998 4:53 PM
To: [log in to unmask]
Subject: Re: [DC] No. of layers Vs. cost
Well, I was really hoping to see a few answers on this one, even though it
would be difficult to make a predictable rule or guideline about it. (did
you get any answers privately?)
Anyway, I can tell you this much, maybe it will help:
All of my experience with quoting/purchasing boards has been for fast turn
prototypes, never production. After about 40-50 orders I noticed a general
trend that the layer count was related to the cost in a very simple way.
That is, that the layer count was proprtional to the cost almost directly,
so that a 4 layer board would cost 4/2 as much as a 2 layer board, but
adding two MORE layers, 6 layer board would only cost 6/4 as much as a 4
layer board, or 1.5 times as much. If you can shave two layers off a 12
layer board, you will pay only 10/12 as much for it.
OK, take that with a grain of salt, and its only a ROUGH estimate, but I
got
to where I could make a reasonable prediction using that rule.
Good Luck,
Jack
-----Original Message-----
From: Gagrani, Kishore [SMTP:[log in to unmask]]
I understand that more no. of layers would increase the cost of
PCB,
but how is this function related ? Is there any formula (certainly
will have many no. of variables) which can be applied to figure
this
out ?
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