I have a transistor that I can't seem to identify. It works as a PNP in a circuit and the only markings I see on it are stamped on the top.


Google doesn't show a transistor with that designation and usually they start with 2N, not 2A. My best guess is that it's a 2N404A but I'm just not certain.

Is there another way to identify it?

Is that a TO-5/11/18 can with polarity marker stud?
Usually they are printed/marked on the side of the barrel.

I just looked through my old ECG, NTE, and SK catalogs and didn't find anything close.

quote:

Originally posted by stoic-one:
Is that a TO-5/11/18 can with polarity marker stud?
Usually they are printed/marked on the side of the barrel.

I just looked through my old ECG, NTE, and SK catalogs and didn't find anything close.

Every other transistor has an inked designation in the side of the can. This is the only odd ball.

What is it in? I would guess it is a "house number", probably some special selection.

quote:

Originally posted by BDA220:
What is it in? ...

A plastic baggie.

Mark123 do you do circuit board work?

quote:

Originally posted by Ozarkwoods:
Mark123 do you do circuit board work?

Yes. It's my main hobby.

Normally, I'd just toss an unmarked component but these germanium transistors can be $12.

Probably old/obsolete.

It's got a 2 in there, so probably two-junction- Could be a FET or BJT. You would need to stick it on a curve tracer to characterize it. There's probably an old fart on here who knows how to guess it with the diode setting on a good meter. I don't.

quote:

Originally posted by mark123:

quote:

Originally posted by Ozarkwoods:
Mark123 do you do circuit board work?

Yes. It's my main hobby.

Normally, I'd just toss an unmarked component but these germanium transistors can be $12.

I have a control board that is not working properly. I think it might be a transistor issue. If you want to know more or think you could help I would be willing to work out something. If you want to email me my email is in my profile. Thanks

quote:

Originally posted by Ozarkwoods:

quote:

Originally posted by mark123:

quote:

Originally posted by Ozarkwoods:
Mark123 do you do circuit board work?

Yes. It's my main hobby.

Normally, I'd just toss an unmarked component but these germanium transistors can be $12.

I have a control board that is not working properly. I think it might be a transistor issue. If you want to know more or think you could help I would be willing to work out something. If you want to email me my email is in my profile. Thanks

I'll email you.

quote:

Originally posted by mark123:

quote:

Originally posted by Ozarkwoods:

quote:

Originally posted by mark123:

quote:

Originally posted by Ozarkwoods:
Mark123 do you do circuit board work?

Yes. It's my main hobby.

Normally, I'd just toss an unmarked component but these germanium transistors can be $12.

I have a control board that is not working properly. I think it might be a transistor issue. If you want to know more or think you could help I would be willing to work out something. If you want to email me my email is in my profile. Thanks

I'll email you.

Sounds good

quote:

Originally posted by Ozarkwoods:

quote:

Originally posted by mark123:

quote:

Originally posted by Ozarkwoods:

quote:

Originally posted by mark123:

quote:

Originally posted by Ozarkwoods:
Mark123 do you do circuit board work?

Yes. It's my main hobby.

Normally, I'd just toss an unmarked component but these germanium transistors can be $12.

I have a control board that is not working properly. I think it might be a transistor issue. If you want to know more or think you could help I would be willing to work out something. If you want to email me my email is in my profile. Thanks

I'll email you.

Sounds good

Sent last night from my business email. Forgot to switch it over to my SIGforum account.