Pocket Programmer Info?

[Kristopher Means]

Ludis Langens wrote:

> They are in different packages.  The 4401 is in the little black plastic
> cylinders with one flat side.

It's called a TO-92 package.

>                               The 2222 historically came in metal cans,

While TO-5 packages (metal cans) once were the norm, that is really ancient
history.  The only devices that you find standard are usually RF amps or other
types requiring heat sinks.  Today 99.99% of all small bipolar transistors
and FETs come in TO-92 unless special ordered.


> though there is now a variant available in plastic.  I think it's called
> the 2N2222P.  I don't know if the pinout is the same as the 2N4401 or not.


The part number on transistors usually doesn't change with the package.  Pick
one up and it'll say 2N2222 no matter what.  A "P" suffix usually denotes a
device with higher power dissipation, which would probably be a TO-5.

Also, 90% of these devices have a EBC pin-out, but with only three leads it
really doesn't matter that much - you can easily bend them around to the
proper holes.  And a few seconds with an ohm meter will tell you if you
have one of the uncommon ECB devices.

The bottom line is if you have to replace the 2N4401 you can use a 2N2222,
or for that matter probably a good old 2N3904.  The other transistors (PNP,
2N3905, 2N3906) can be replaced with a 2N3906, all of which are readily
available anywhere they sell electronic components.

-- Kris

   "There is something to be said about geeks who know they are geeks.
     People who are self-aware about their place in the world possess, at
      the least, a sense of humor. Anime fans and computer nerds fall into
       this category. Goth people and Renaissance festival fanatics do not."
           http://www.houstonpress.com/issues/2001-08-02/feature.html

----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org