On Fri, 12 Sep 2008 02:33:18 -0400, the dip**** <sgonedes@[EMAIL PROTECTED]
>
wrote:
>
>
>Hello, I am wondering if anyone knows the pin layout for a l7812acv cc077
v6
>march 819 and a l7912acv gk243 vw chn 734. The products where purchased
via
>newark.com from ST electronics. I checked the datasheets and the three
that
>I have read all provide different pin layouts. I like to be sure that I
get
>the pins right before I start pulling from the transformer - it's just a
>minor issue but the koreans TL431 datasheet is much different than the
ones
>that are available to US citizens.
From the National Semiconductor website (they invented the 78xx and
79xx voltage regulators):
The 78xx datasheet is available from
http://www.national.com/JS/searchDo***ent.do?textfield=lm7812&x=0&y=0
and shows your pin 1 as input, 2 as ground, and 3 as output.
The 79xx datasheet is at http://www.national.com/mpf/LM/LM7912.html
,
and shows pin 1 as ground, 2 as input and 3 as output. (yes, the
positive and negative regulators do have different pinouts)
Other manufacturers will follow the same pinouts, so we can buy parts
from anyone without having to change the board layout.
You can find the genuine ST Electronics datasheets at
http://www.st.com
--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca
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