I agree with Dwayne. All parts (SMD & TH) on the same side is the least exp= ensive process. I was an Electronic Manufacturing Engineering manager for the previous 40 y= ears, 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=A0 If quantity is large, Wave soldering require a Wave palette to protect SMD = being washed out by wave. small parts can be glued before wave to avoid palette.=A0 Just my $0.02, Jean-Paul AC9GH "Democracy is two wolves and a lamb deciding what to have for dinner.=20 Liberty is a well-armed lamb." - Benjamin Franklin - On Tuesday, November 12, 2013 1:05 PM, Dwayne Reid = wrote: =20 My limited experience has shown that having both=20 SMD and through-hole parts on the SAME side of=20 the PCB is less expensive.=A0 This is because its=20 easier to process the boards: first, you populate=20 and solder the SMD parts, then you populate and=20 wave-solder the through-hole parts. Although you can wave-solder the side of a PCB=20 that has SMD parts present, its much more=20 difficult.=A0 Component lead orientation is=20 important and all of the SMD parts have to be glued.=A0 But it can be done. Something else worth considering: you can ship=20 your boards off to a contract manufacturer to=20 have the SMD parts mounted and soldered, then=20 bring them back into your own shop to have the=20 through-hole parts mounted and soldered.=A0 That is=20 exactly what we are going to be doing for one=20 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. --=20 Dwayne Reid=A0 Trinity Electronics Systems Ltd=A0 =A0 Edmonton, AB, CANADA (780) 489-3199 voice=A0 =A0 =A0 =A0 =A0 (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .