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. 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. Component lead orientation is=20 important and all of the SMD parts have to be glued. 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. 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 Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (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 .