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PICList Thread
'PCB parts libraries [OT]'
1999\10\30@032532 by Jason Muhammad

picon face
I drew a schematic with a Schematic drawing program, built and tested
the circuit, and now I am ready to have a PCB made.  This is initially a
low volume circuit (50-100 boards).  I have a PCB manual layout program,
but you have to know the parts footprints.  The documentation has the
footprints of it components in 'mils'.

I have sourced all the parts from DigiKey, who measures the components
in 'mm' or inches.  Either I have to convert all of my documents 'mils'
to mm, or I need to find somewhere that lists 'common' parts
footprints.  For example, 1N4002 axial lead diode: is it D0-7, DO-14,
DO-15, DO-16,etc.  Anyone know a catalog that designates its parts in
JEDEC formats?

--
Jason
========================================
Website: http://www.execpc.com/~milsumai
E-Mail:  spam_OUTmilsumaiTakeThisOuTspamexecpc.com
ICQ # :  12978762
========================================
         .:::.
          ,,,
        _(- -)_
       /  ( )  \
       \_/ : \_/
        |_/ \_|
         | | |
      -TRY PRAYER-

1999\10\30@034238 by John De Villiers

flavicon
face
> I drew a schematic with a Schematic drawing program, built and tested
> the circuit, and now I am ready to have a PCB made.  This is initially a
> low volume circuit (50-100 boards).  I have a PCB manual layout program,
> but you have to know the parts footprints.  The documentation has the
> footprints of it components in 'mils'.
>
> I have sourced all the parts from DigiKey, who measures the components
> in 'mm' or inches.  Either I have to convert all of my documents 'mils'
> to mm, or I need to find somewhere that lists 'common' parts
> footprints.  For example, 1N4002 axial lead diode: is it D0-7, DO-14,
> DO-15, DO-16,etc.  Anyone know a catalog that designates its parts in
> JEDEC formats?

1000 mils = 1 inch

1999\10\30@034451 by Dave VanHorn

flavicon
face
> I have sourced all the parts from DigiKey, who measures the components
> in 'mm' or inches.  Either I have to convert all of my documents 'mils'
> to mm, or I need to find somewhere that lists 'common' parts
> footprints.  For example, 1N4002 axial lead diode: is it D0-7, DO-14,
> DO-15, DO-16,etc.  Anyone know a catalog that designates its parts in
> JEDEC formats?

Sure don't..

And sometimes the drawings are on centerline, and sometimes they are reffed
to some arbitrary point.  Look in the Digikey cap section, even within the
panasonic parts, some are in mils, and some are in mm, and some that are
dimmed in mm, were clearly designed for an inch system...  :-P

I've always found it best to do my own footprints, and ref them to digikey
part numbers if applicable.

1999\10\30@110431 by Jason Muhammad

picon face
To John De Villiers:  Thanks...I know about mils.  Everything in my
parts library documentation is listed in mills while the dimensions in
DigiKey are listed in mm or in.

To Dave VanHorn:  Do you mean you just put layout single pads instead of
using the PCBs parts library layout, ie layout 8 individual pads 0.254
inches apart for a 8-pin DIP instead of using the DIP library?

Dave VanHorn wrote:
{Quote hidden}

--
Jason
========================================
Website: http://www.execpc.com/~milsumai
E-Mail:  .....milsumaiKILLspamspam@spam@execpc.com
ICQ # :  12978762
========================================
         .:::.
          ,,,
        _(- -)_
       /  ( )  \
       \_/ : \_/
        |_/ \_|
         | | |
      -TRY PRAYER-

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