Hi Jerry,

I've always used silkscreen markings for SMD pin 1s. In ALL the
companies I've worked it's always been that way. I've heard the opinion
of using the padshape (as Harris does) to visualize pin 1s, but I've
never seen it in practice. With tighter densities you just have to be
extra careful of moving them around in the end so they make sense to the
assembly folks, and that they don't get covered up or just plain removed
by the CAM folk (like when an indicator is over a test point pad/via).

Hope this helps.

Mitch

>
>      > All,
>      >
>      >         Do any of you use some kind of pin 1 indicators built
into your smd
>      pads
>      > ?
>      > For example using a pad with an extra tab or an oblong pad.
>      >         Could you please tell me why this is done at your
company and if you
>      > have had any problems
>      > with fabricators testing these designs ?
>      >
>      >         Background:
>      >         Yes, we add tabs on pin 1 pads at Harris. We have had
problems with
>      > some testing houses on fine pitch devices because the offset in
this pad can
>      > cause the test
>      > probe to not hit the pad properly. We are considering
alternatives but would
>      > like to hear what
>      > other companies think and do.
>      >
>      >
>      >         Regards,
>      >
>      >                 Jerry Schwartz, CID
>      >                 IPC Certified Interconnect Designer
>      >                 "May the Schwartz be with you"
>      >
>      > Jerry Schwartz, CID             Designer 3
>      > Harris Corporation GCSD         Voice (321)-727-5474
>      > P.O. Box 37, MS 1/9843          Fax   (321)-729-5990
>      > Melbourne, FL 32902-0037        Pager (321)-690-9797
>      > mailto:[log in to unmask]
>      > http://harris.com
>      >
>      >
>
--------------------------------------------------------------------------------
>      > -
>      > DesignerCouncil Mail List provided as a free service by IPC
using LISTSERV
>      1.8d
>      > To unsubscribe, send a message to [log in to unmask] with
following text in
>      > the BODY (NOT the subject field): SIGNOFF DesignerCouncil.
>      > To set a vacation stop for delivery of DesignerCouncil send:
SET
>      DesignerCouncil
>      > NOMAIL
>      > Search previous postings at: www.ipc.org > On-Line Resources &
Databases >
>      > E-mail Archives
>      > Please visit IPC web site (http://www.ipc.org/html/forum.htm)
for additional
>      > information, or contact Keach Sasamori at [log in to unmask] or
847-509-9700
>      > ext.5315
>      >
>
--------------------------------------------------------------------------------
>      > -
>
>
---------------------------------------------------------------------------------
>      DesignerCouncil Mail List provided as a free service by IPC using
LISTSERV
>      1.8d
>      To unsubscribe, send a message to [log in to unmask] with following
text in
>      the BODY (NOT the subject field): SIGNOFF DesignerCouncil.
>      To set a vacation stop for delivery of DesignerCouncil send: SET
DesignerCouncil
>      NOMAIL
>      Search previous postings at: www.ipc.org > On-Line Resources &
Databases >
>      E-mail Archives
>      Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
additional
>      information, or contact Keach Sasamori at [log in to unmask] or
847-509-9700
>      ext.5315
>
---------------------------------------------------------------------------------
>
---------End of Included Message----------
_____________________________________________________________
Tired of limited space on Yahoo and Hotmail?
Free 100 Meg email account available at http://www.dacafe.com

---------------------------------------------------------------------------------
DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF DesignerCouncil.
To set a vacation stop for delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------