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I have this transistor and cannot find its reference/datasheet. I've tried some variations of the name but nothing showed up. I know it is not an unusual model because here where I live we only find most used types.

It is marked N 842 00-000, here is a picture of it:

N842

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    \$\begingroup\$ That "00-000" is veeeery suspicious... \$\endgroup\$ – Ignacio Vazquez-Abrams Dec 7 '13 at 17:15
  • \$\begingroup\$ Yes! And the worse thing is that it was me who bought this but a long time ago. And I know this was not the code (N842) that I had. I just do not know how to find out which was, based on that now. \$\endgroup\$ – Felipe_Ribas Dec 7 '13 at 17:24
  • \$\begingroup\$ Have you performed diode and resistance checks on it yet? \$\endgroup\$ – Ignacio Vazquez-Abrams Dec 7 '13 at 17:27
  • \$\begingroup\$ Only diode test to find out if it is pnp or npn. It seems to be npn type. With my multimeter which gives me a 780 in diode test with a BC337-40, it shows 700 in diode test with this N842 guy. \$\endgroup\$ – Felipe_Ribas Dec 7 '13 at 17:31
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This is probably a transistor labeled with a internal company part number. This is even more likely since you say you get mostly used parts in your area. The part is unlikely to be used, but it sounds like your market is the kind of place where overstocks of private-label parts often end up.

Assume you're not going to find a datasheet and go from there. Don't use this part in production or in a demanding application. Otherwise, you can measure the basic parameters well enough for most purposes. You can determine NPN versus PNP directly, get a good idea of gain by measuring, and the package gives you a good idea of power dissipation. Other than that, just don't assume it's good to particularly high frequencies or high voltages. Treat it like a small signal transistor good for 30 V and you will likely be fine.

If you want better specs, buy something with better specs.

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