Searching \ for '[PIC]: 7805A pins' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/power.htm?key=7805
Search entire site for: '7805A pins'.

Exact match. Not showing close matches.
PICList Thread
'[PIC]: 7805A pins'
2003\03\13@172240 by John Nall

flavicon
face
I'm kind of embarrassed at asking this, but I need a little help in
identifying the pins on a 7805a voltage regulator. :-(    I can't find a
datasheet on it.  The closest thing I found was the National Semiconductor
sheet on the 75xx family, which one would assume would include the
7805a.  But not so.  It includes the 7805, but there are some differences
between the drawing and what I am seeing on the 7805A, so there might be
other differences.

So my assumption is that looking at it from the front, from left to right
would be input, ground, output, since this was the layout of  the
7805.  But if someone knows for sure, I'd sure love to know it.  Not sure
how delicate they are......

John

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

2003\03\13@184016 by Jai Dhar

flavicon
face
Stupid question, but are you SURE it's a 7805a? I can't seem to locate any
parts going by that number....

Try looking for "7805a" on google, won't find much...

Quoting John Nall <spam_OUTjnall01TakeThisOuTspamALLTEL.NET>:

{Quote hidden}

----------------------------------------
This mail sent through http://www.mywaterloo.ca

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

2003\03\13@184238 by ?c2FtbyBiZW5lZGnoaeg=?=

Hi!

All 78xx regulators I used had the pinout the way you said (I presume TO-220
housing ). They aren't that delicate, they aren't that expensive, so you
could easily test our assumtion on one of them  :-)

Regards, Samo
{Original Message removed}

2003\03\13@192047 by Larry Williams

flavicon
face
try lm7805 for part number. go to http://www.freetradezone.com and register. best
database of parts you can find. free with access to all non obsolete parts. pay
high price, and get access to virtually ALL parts. current and obsolete.

Jai Dhar wrote:

{Quote hidden}

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

2003\03\13@193535 by John Nall

flavicon
face
At 06:39 PM 3/13/2003 -0500, you wrote:
>Stupid question, but are you SURE it's a 7805a? I can't seem to locate any
>parts going by that number....
>
>Try looking for "7805a" on google, won't find much...

I tried looking for 7805a on Google.  Didn't find much.  (I tried BEFORE
the posting).

I ordered 7805's from Mouser, and it says "7805a JRC M2202G" on the front
of the sucker.  So yeah, I feel pretty sure it is a 7805 of some sort.

But it is a moot question at this point.  After waiting a reasonable while
for someone to point me the way, I hooked up 10 volts to the left pin,
ground to the middle pin, and output from the right pin (all as seen from
the front), backed off a few feet and turned on the power supply.  When no
smoke, I checked the output (right pin).  It says 5 volts.  So I suppose
all is OK.....but my faith in Google has been permanently
impaired.....surely somewhere has said something about this....they must be
slipping....

John

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

2003\03\13@203647 by jim barchuk

flavicon
face
Hi [John + lost track of OP]!

On Thu, 13 Mar 2003, John Nall wrote:

> all is OK.....but my faith in Google has been permanently
> impaired.....surely somewhere has said something about this....they must be
> slipping....

There's also groups.google.com, sometimes even -more- valuable because it
offers varying opinions, in ths case returning
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&threadm=4jt0g8%24brd%40ionews.ionet.net&rnum=5&prev=/groups%3Fhl%3Den%26lr%3D%26ie%3DUTF-8%26oe%3DUTF-8%26q%3D%252B7805a%2B%252Bregulator

Found a reference to an RS part number in another post but radioshack.com
says 'not found,' I'm sure because it's discontinued.

In any case that poster said: (Seven years ago! LOL!)

====
From: Beau Schwabe (bschwabespamKILLspamionet.net)
Subject: Re: 9V battery - to make a 5V supply for 74 range of ICs - How?
Newsgroups: sci.electronics.basics
Date: 1996/04/03

You can use a 3-Terminal Positive Voltage Regulator (78xx - Series)

7805A - Positive 5 Volts (Standard @ Radio-Shack rated at 1.5 Amps)

7805UA - Positive 5 Volts (Digi-Key rated at 100mA [TO-92 case] )

Looking at the "Regulator" with the "TAB" away from you the pins from
Left to Right are...

1 2 3

where "1" is the INPUT  (+9 Volt battery)

     "2" is the GND    (Common)

     "3" is the OUTPUT (+5 Volts)
all you really need, since you are operating from a
Battery is a 10uF Cap across pins 2 & 3 noting the
polarity of the Cap.




Beau Schwabe
.....bschwabeKILLspamspam.....ionet.net
====

But the point of this exercise for the student was to know for sure which
pin did what, if the pinouts are the same as 7805. I'd be -totally-
gabberflasted if they were different. So, hook it up in 7805 pinouts as a
highly current limited circuit and see what it does.

Have a :) day!

jb

--
jim barchuk
EraseMEjbspam_OUTspamTakeThisOuTjbarchuk.com

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

2003\03\14@005638 by Andre Abelian

picon face
John,

Just took me 5 seconds to find it
http://www.national.com/ds/LM/LM7512C.pdf

Andre Abelian


{Original Message removed}

2003\03\14@075507 by John Nall

flavicon
face
At 09:13 PM 3/12/2003 -0800, you wrote:
>John,
>
>Just took me 5 seconds to find it
>http://www.national.com/ds/LM/LM7512C.pdf

Yeah, it only took me 5 seconds to find that one too. :-)   But that
doesn't have the 7805a on it and the drawing of the 7805c does not match
the regulator that I have.  In particular, they show a little dot on the
drawing which indicates pin 1.  My regulator has no such dot.  That is why
I was concerned that there may be a difference (turns out in practice that
there was not, however).

This thread has probably gone on long enough.  :-)  Over and out.

John

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics

2003\03\14@094709 by Paul Hutchinson

flavicon
face
"A" appended to the part number of a National Semiconductor or Motorola (On
Semiconductor) linear component, often means it has improved specifications.
Looking in the 1988 Motorola Data book I find MC7805A, a 2% accurate version
of a 7805.

Paul

> {Original Message removed}

2003\03\14@140610 by Andre Abelian

picon face
John,

Pin outs are the same and he needed to know about pin outs only
LM7805A is discontinued part and replaced with LM340-5.0 or LM7805C
And what you didn't like about my 5 second comments?

Andre Abelian




{Original Message removed}

2003\03\14@173322 by Sean Alcorn - PIC Stuff

flavicon
face
--Apple-Mail-4-654425553
Content-Transfer-Encoding: 7bit
Content-Type: text/plain;
       charset=US-ASCII;
       format=flowed

John,

> I ordered 7805's from Mouser, and it says "7805a JRC M2202G" on the
> front
> of the sucker.  So yeah, I feel pretty sure it is a 7805 of some sort.

Here you had gone a long way to answering your own question. They are
not a National part and therefore National suffixes do not apply. They
are manufactured by a company called "Japan Radio Company" AKA "New
Japan Radio Co." whose parts are distributed by Mouser, I believe.

Regards,

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics



--Apple-Mail-4-654425553
Content-Transfer-Encoding: 7bit
Content-Type: text/enriched;
       charset=US-ASCII

John,


<excerpt><fixed>I ordered 7805's from Mouser, and it says "7805a JRC
M2202G" on the front

of the sucker.  So yeah, I feel pretty sure it is a 7805 of some sort.

</fixed></excerpt>

Here you had gone a long way to answering your own question. They are
not a National part and therefore National suffixes do not apply. They
are manufactured by a company called "Japan Radio Company" AKA "New
Japan Radio Co." whose parts are distributed by Mouser, I believe.


Regards,


--Apple-Mail-4-654425553--

More... (looser matching)
- Last day of these posts
- In 2003 , 2004 only
- Today
- New search...