Re: gEDA-user: pcb SMT footprints

[Steve Meier <smeier@xxxxxxxxxxxxxxxxxxx>]

IPC-SM-782A (section 8.1) defines the dimensions of a 603 chip resistor
land pattern to be

Length 2.80 mm
Width  1.00 mm
gap    0.60 mm

The IPC standard has been criticized before for having large foot print
sizes.

Steve Meier





On Thu, 2005-11-17 at 08:33 -0800, Larry Doolittle wrote:
> Stephen Meier wrote:
> > Here is a set of foot prints that I have been working on.
> 
> That 0603 footprint is much larger than any other I've seen.
> Is that on purpose?
> 
> Meier  IPC-RLPN-132A  1608 [0603]
>    length      110
>    width        39
>    terminal     43
>    gap          24
> 
> Dan McMahill wrote:
> > For example an 0603 capacitor is CAPC2012L, CAPC2012N, and CAPC2012M.
> > L=least, N=nominal, M=most. So if you want to be agressive with small
> > pads use the "L", and "M" for larger pads. The 2012 is from the metric
> > dimensions.
> 
> Hmmm.  An 0603 part has nominal dimensions 60 mils x 30 mils,
> or in metric, 1.6 mm x 0.8 mm.  Where did "2012" come from?
> I guess it's a typo for "1608", and Dan mixed up this conversation
> with a discussion of 0805 parts.
> 
> Dan, can you send me (or point me to) the CAPC1608* footprints,
> so I can compare them with the others?
> 
>       - Larry
> 
> P.S.  Sorry about the sorting of this message in the thread.
> At least I got it in the right thread!