[sdiy] smt keepout area

Tim Ressel madhun2001 at yahoo.com
Tue Jul 31 15:22:00 CEST 2012

Thanks to everyone who responded. I see know how to determine these properly. Unfortunately the free land pattern calculator from PCB Matrix it seems is no longer free. Anyone know of a free land pattern calculator? I don't want to drop $120 to buy the standard if I don't have to.

--Tim (cheap) Ressel

----- Original Message -----
From: Vesa Lahteenmaki <vjhl2000 at hotmail.com>
To: madhun2001 at yahoo.com; synth-diy at dropmix.xs4all.nl
Sent: Monday, July 30, 2012 11:40 PM
Subject: RE: [sdiy] smt keepout area

As a good rule of thumb, keepout width should be 0.5 mm, so minimum free space between footprints of two components will be 1.0 mm. Same rule applies to the minimum distance of component bodies
This minimum value applies to all components, not just your resistor
This value is learned from IPC stadard:
IPC-D-7351B "Generic Requirements for Surface Mount Design and Land Pattern Standard"

> Date: Sun, 29 Jul 2012 10:42:06 -0700
> From: madhun2001 at yahoo.com
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] smt keepout area
> Hi,
> I am having the dickens of a time finding out how to determine the proper keepout area for a surface mount resistor. Just a standard 0603. The datasheets from the manufacturers I looked at show the land patterns in great detail but are mum about keepout. I suspect its more a function of the machine doing the placement. Does anybody know about this?
> Thanks!
> --Tim (uncharted territory) Ressel
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