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Mixed PTH and SMD PCB

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Flyback

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We are doing a PCB which has both surface mount components and through hole components on it.
The surface mount components are on both sides of the PCB.
What’s the closest that a surface mount pad can be to a through hole pad?
 
We are doing a PCB which has both surface mount components and through hole components on it.
The surface mount components are on both sides of the PCB.
What’s the closest that a surface mount pad can be to a through hole pad?
Check your manufacturer's requirements. They will give you a minimum trace width/copper clearance. If you're having the supplier assemble the boards for you, generally the through-hole parts are done as a secondary process and the only restriction on spacing is the etch clearance.
 
Seeed Studios has a very good PCB Design Guide. It's worth a browse. But DerStrom is right, your fabricator and assembler will have the final say.

Position parts on the bottom of the board to allow room to hand-solder through-hole components - there will have to be clearance for a soldering iron tip without messing up SMT components.
 
I'm inclined to just say "it depends".

It depends highly on the processes involved. Are the SMD components only reflowed? Do you have a wave process? What direction is the wave process, and is there sufficient space to not cast shadows? What parts are reto-fitted/hand placed? etc etc.
 
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