Not to argue, but have you considered the reduction of board area for the
parts on both sides version? Given an equivalent size board, I completely
agree with your list. But at least for me, parts on both sides cut board
area to less than half and the result was (slightly) less expensive.

-Denny

On Tuesday, November 12, 2013, Jean-Paul Louis wrote:

>
>
> I agree with Dwayne. All parts (SMD & TH) on the same side is the least
> expensive process.
> I was an Electronic Manufacturing Engineering manager for the previous 40
> years, and costed 1000's
> of boards going to be produced in quantities from a few hundreds to
> several millions.
>
> List in order of increasing cost:
> 1- All SMD one side
> 2- All TH one side
> 3- SMD & TH all on top side
> 4 SMD on both sides and TH.
> This has different options depending on quantity
> If quantity is large, Wave soldering require a Wave palette to protect SM=
D
> being washed out by wave.
> small parts can be glued before wave to avoid palette.
>
> Just my $0.02,
>
> Jean-Paul
> AC9GH
>
> "Democracy is two wolves and a lamb deciding what to have for dinner.
> Liberty is a well-armed lamb."     - Benjamin Franklin -
>
>
>
> On Tuesday, November 12, 2013 1:05 PM, Dwayne Reid <dwayner@planet.eon.ne=
t<javascript:;>>
> wrote:
>
> My limited experience has shown that having both
> SMD and through-hole parts on the SAME side of
> the PCB is less expensive.  This is because its
> easier to process the boards: first, you populate
> and solder the SMD parts, then you populate and
> wave-solder the through-hole parts.
>
> Although you can wave-solder the side of a PCB
> that has SMD parts present, its much more
> difficult.  Component lead orientation is
> important and all of the SMD parts have to be glued.  But it can be done.
>
> Something else worth considering: you can ship
> your boards off to a contract manufacturer to
> have the SMD parts mounted and soldered, then
> bring them back into your own shop to have the
> through-hole parts mounted and soldered.  That is
> exactly what we are going to be doing for one
> product that is now sufficiently mature.
>
> dwayne
>
>
> At 01:40 AM 11/12/2013, Ruben J=F6nsson wrote:
>
> >Now I have been thinking of this in terms of cost. Say we have 3
> >different boards with the same amount and type of components (more
> >than 90% SMD) and the same size of the board. How would the assembly
> >cost compare between these boards if they where:
> >
> >A. SMD and TH components on the same side
> >
> >B. SMD on one side and TH on the other side
> >
> >C. About half of the SMD on one side, the rest on the other side and
> >TH on one side.
>
>
> --
> Dwayne Reid   <dwayner@planet.eon.net <javascript:;>>
> Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
> (780) 489-3199 voice          (780) 487-6397 fax
> www.trinity-electronics.com
> Custom Electronics Design and Manufacturing
>
>
>
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