I think the deal with those is that one edge is chamfered more than the
other, and in this case the chamfered edge is the one on the bottom as
you're looking at the text.

So Pin1 is the pin closest to the ST logo.

take a look at page 13:
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DAT=
ASHEET/CD00000464.pdf

DougM

On Thu, Feb 17, 2011 at 7:46 PM, Nathan House <nathanpiclist@gmail.com>wrot=
e:

> There actually isn't an 'x' on mine. I finally found a picture of the
> one I have in an ebay listing:
>
> http://cgi.ebay.com/10-x-LM358DT-LM358-Low-Power-Dual-Op-Amp-SOIC-8-SMD-I=
C-/320612943519?pt=3DLH_DefaultDomain_0&hash=3Ditem4aa605469f
>
> See how there's no markings?
>
>
> On Thu, Feb 17, 2011 at 10:32 PM, PICdude <picdude3@narwani.org> wrote:
> > Would be shocked to see if any of the pros say something different on
> > this, but I've personally never seen a chip that would have anything
> > other than the lower-left corner pin near the "X" as pin 1.
> >
> > Cheers,
> > -Neil.
> >
> >
> >
> > Quoting Nathan House <nathanpiclist@gmail.com>:
> >
> >> I'm trying to use a LM358 dual op amp IC and have a little problem; I
> >> don't know which pin is pin 1. I can't seem to get my camera to take a
> >> good picture of something this small, but it looks kind of like this:
> >> http://farm2.static.flickr.com/1352/5179445393_b6b4d864e0.jpg. There's
> >> no circle by the first pin, and there's no notch at the top.
> >> Intuitively, it seems like with the text right-side-up (like in the
> >> photo) the first pin would be on the lower left, but I don't know for
> >> sure..
> >>
> >> Any ideas?
> >> --
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> >
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