Re: gEDA-user: SC70-6, which is pin 1?

[Joe Chisolm - Gmail <jchisolm6@xxxxxxxxx>]

 If the lot marking is oriented so you can read it pin 1 should be 
lower left but verify from the tape reel. Look at page 15 of

http://focus.ti.com/lit/an/szza021c/szza021c.pdf

The basic rules are (from page 15):

Component orientation in the carrier-tape pocket is governed by EIA-783, 
which states that the
following orientation rules shall be followed, sequentially, until no 
other variation is possible (see
Figure 11):
1. The largest axis of the component outline shall be perpendicular to 
the tape length.
2. The edge of the package containing termination 1 shall be oriented 
toward the round
sprocket holes.
3. For the components where rule 1 and rule 2 do not establish a unique 
orientation,
termination 1 shall be in quadrant 1 (see Figure 12).
Typical TI component orientation is shown in Figure 13.

On 04/01/2011 11:35 AM, yamazakir2 wrote:
> The datasheet is pretty ambiguous, take a look and let me know what
> you guys think:
>
> http://focus.ti.com/lit/ds/symlink/sn74lvc1g3157.pdf
>
> On Fri, Apr 1, 2011 at 5:21 AM, Cullen Newsom<cullennewsom@xxxxxxxxx>  wrote:
> >    Have you got a part number for it? What's inside? You could use a DMM
> >    to confirm, if you consider its internals. Your guess of bottom left
> >    seems reasonable.
> >    -CN
> >
> >    On Fri, Apr 1, 2011 at 4:13 AM, yamazakir2<[1]yamazakir2@xxxxxxxxx>
> >    wrote:
> >
> >      I'm guessing based off that mark the bottom left pin is pin 1. The
> >      datasheet isn't clear. Does anybody know for sure if thats pin 1?
> >      _______________________________________________
> >      geda-user mailing list
> >      [2]geda-user@xxxxxxxxxxxxxx
> >      [3]http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
> >
> > References
> >
> >    1. mailto:yamazakir2@xxxxxxxxx
> >    2. mailto:geda-user@xxxxxxxxxxxxxx
> >    3. http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
> >
> >
> >
> > _______________________________________________
> > geda-user mailing list
> > geda-user@xxxxxxxxxxxxxx
> > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
>
> _______________________________________________
> geda-user mailing list
> geda-user@xxxxxxxxxxxxxx
> http://www.seul.org/cgi-bin/mailman/listinfo/geda-user

--
Joe Chisolm
Marble Falls, Tx.
830-265-8018



_______________________________________________
geda-user mailing list
geda-user@xxxxxxxxxxxxxx
http://www.seul.org/cgi-bin/mailman/listinfo/geda-user