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DPRG: Blasted 2N2222 transistor...
Subject: DPRG: Blasted 2N2222 transistor...
From: Dave Everett
deverett at idx.com.au
Date: Sun Nov 22 15:46:52 CST 1998
At 14:55 22-11-98 -0600, you wrote:
>Randy Carter wrote:
>> The 2N2222 is an American transistor. Therefor it has the E-B-C pin
>> out. It comes in either a TO-92 plastic case or a metal can. The pin
>> out you mentioned is the Japanese E-C-B pin out. This is the logical
>> consequence of the physical structure of the device. The TO-220 pin
>> out is B-C-E for both American and Japanese transistors.
>
>
>
>I've never noticed that. Are you sure it's that way all the time?
>How about darlingtons? Seems to me that EBC would make more sense.
>Isn't the base in the middle physically?
>
>
Perhaps I can clear up some of this :)
In the TO-92 package there are 2 transistor variants:
Viewed from the front,
C-B-E and C-E-B
C-B-E is used in all BC transistors, and the 2N2222.
Now for the bad news, some manufacturers, including NTE have chosen to
disregard the standard and use their own pinout. For NTE the pinout is
E-B-C, the reverse of the standard!
The best advice is to invest in a transistor handbook which will have a
diagram number for every transistor. I'm on the lookout for an online
handbook if anyone knows of one.
The best I've managed to find is a substitute database at:
http://www.ee.washington.edu/eeca/parts/cross.html
It's good but lacks pinout info.
Dave Everett
Domestic Droids Website
http://members.xoom.com/Mowbot/
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