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 Forum index » DIY Hardware and Software
NTE123AP as replacement for BC547?
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Scot Solida



Joined: Oct 24, 2009
Posts: 100
Location: Hutchinson Kansas
PostPosted: Tue Dec 01, 2009 3:54 pm    Post subject: NTE123AP as replacement for BC547? Reply with quote  Mark this post and the followings unread
Forgive my ignorance... I'm pretty new to all of this DIY stuff. A lot of the stuff I want to build (and have built) uses BC547 transistors. These are impossible to find locally, but as far as I can see the NTE123AP should be okay to use in its place. Am I wrong? My main confusion, however, lies in the orientation. I am not sure I understand the datasheet. I think I need to reverse the orientation of the NTE123AP. Can anyone confirm this?

Datasheets:

http://www.nteinc.com/specs/100to199/pdf/nte123ap.pdf
http://www.datasheetcatalog.org/datasheet/fairchild/BC547.pdf
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Danno Gee Ray



Joined: Sep 25, 2005
Posts: 1351
Location: Telford, PA USA
PostPosted: Tue Dec 01, 2009 8:38 pm    Post subject: Reply with quote  Mark this post and the followings unread
It would appear your read on that is correct regarding orientation.

Why the NTE part? try a 2N3904, should be much cheaper than the NTE if you buy in bulk. May have ty flip orientation with the 3904 as well.
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Scot Solida



Joined: Oct 24, 2009
Posts: 100
Location: Hutchinson Kansas
PostPosted: Tue Dec 01, 2009 9:17 pm    Post subject: Reply with quote  Mark this post and the followings unread
Thanks, that's what I needed to know. Why the NTE? Because a local place had a bunch of them on the cheap.
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etaoin



Joined: Jun 30, 2005
Posts: 761
Location: Utrecht, NL
PostPosted: Wed Dec 02, 2009 1:58 am    Post subject: Re: NTE123AP as replacement for BC547? Reply with quote  Mark this post and the followings unread
Scot Solida wrote:
uses BC547 transistors. These are impossible to find locally


Funny how the single most common and cheapest transistor in Europe can be so hard to find elsewhere in the western world...
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scriptstyle



Joined: Jan 22, 2008
Posts: 250
Location: nj
PostPosted: Wed Dec 02, 2009 2:31 am    Post subject: Reply with quote  Mark this post and the followings unread
i have used NTE123 from a local store, they even had can versions. i think i recall the pin out being the same as 2n3904?
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fonik



Joined: Jun 07, 2006
Posts: 3950
Location: Germany
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PostPosted: Wed Dec 02, 2009 3:36 am    Post subject: Reply with quote  Mark this post and the followings unread
Danno Gee Ray wrote:
try a 2N3904, should be much cheaper than the NTE if you buy in bulk. May have ty flip orientation with the 3904 as well.


yep.

the cheat sheet below shows just only the transistors i have in my drawers...

Posted Image, might have been reduced in size. Click Image to view fullscreen.
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cheers,
matthias
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Scot Solida



Joined: Oct 24, 2009
Posts: 100
Location: Hutchinson Kansas
PostPosted: Wed Dec 02, 2009 4:37 am    Post subject: Reply with quote  Mark this post and the followings unread
Thanks a million for the help guys.

fonik, you're illustrations are always wonderfully clear and helpful!
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TekniK



Joined: Aug 10, 2008
Posts: 1059
PostPosted: Wed Dec 02, 2009 5:49 am    Post subject: Reply with quote  Mark this post and the followings unread
BTW, the NTE123 is an direct substitude for an 2N5089
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