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Re: gEDA-user: SSOP package footprint

On 11/20/06, Meador, Ryan D <rmeador@xxxxxxx> wrote: 
Hi again,
I've got another PCB layout/design question for you all...  One of the parts
I'm looking at is a 2:1 mux (p/n: SN74LVC2G157).  I'm going to order the SSOP
- DCT package from DigiKey.  I set the footprint attribute to SSOP8 in
gschem, but the footprint that comes up in PCB is very much not the same as
the one from the part's datasheet.  After digging around online for a little
while and talking to DigiKey tech support, I've come to the conclusion that
the footprint that PCB thinks is SSOP is wrong!


There are a variety of pin spacings and lead spans for SSOP parts. The one that
came with PCB may not be wrong but different from the one that you need.

There are a variety of footprints on my website www.luciani.org.

The footprint below may work for the TI DCT package and your process but
you need to check it. If you find a mistake please send me an email.

(* jcl *)

--
http://www.luciani.org


---------- cut here -----------

Element[0x0 "TSSOP-65P-400L1-8N__TI_DCT_Package" "" "" 0 0 -2042
-12512 0 100 0x0]
(
  Pad[-7953 -3838 -5235 -3838 1614 2000 3614 "" "1" 0x0100]
  Pad[-7953 -1279 -5235 -1279 1614 2000 3614 "" "2" 0x0100]
  Pad[-7953 1279 -5235 1279 1614 2000 3614 "" "3" 0x0100]
  Pad[-7953 3838 -5235 3838 1614 2000 3614 "" "4" 0x0100]
  Pad[5235 3838 7953 3838 1614 2000 3614 "" "5" 0x0100]
  Pad[5235 1279 7953 1279 1614 2000 3614 "" "6" 0x0100]
  Pad[5235 -1279 7953 -1279 1614 2000 3614 "" "7" 0x0100]
  Pad[5235 -3838 7953 -3838 1614 2000 3614 "" "8" 0x0100]
  ElementLine[-2042 5512 -2042 -5512 1000]
  ElementLine[-2042 -5512 2042 -5512 1000]
  ElementLine[2042 -5512 2042 5512 1000]
  ElementLine[2042 5512 -2042 5512 1000]
  ElementLine[-2042 -5012 -1542 -5512 1000]
  ElementLine[-2042 -4011 -542 -5512 1000]
  ElementLine[-2042 -3011 457 -5512 1000]

)


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