# NPN transistor

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#### Bartx7000

##### New Member
I have a working transistor but the label is missing. How do I find out what it is? I think it is a NPN. It is a power transistor in a T0-3 package. Is there anyway to figure out what it is?

#### herbymcduff

##### New Member
my guess would be that it would be pretty hard to find out what kind of transistor it is. Though you could find out where E,B, and C are, but that still wouldn't help you out.

#### Sebi

##### Active Member
In TO-3 package the case is collector. You can find out the structure with diode-checker or multimeter: connect +wire to pin1 -wire to other pin,afterward -wire to case.If You find with this method two conducted diodes,its NPN transistor,and +wire the base.If nothing found, change polarity..... nothing found connect the + to another pin....
I hope You can understand my bad english,unfortunately i never learn.Maybe help for You.

#### bogdanfirst

##### New Member
ya, but sebi why do you write the thing twice?

#### Sebi

##### Active Member
Sorry,my explorer freezed, but send twice,i donknow why.

#### bogdanfirst

##### New Member
any way didint you post the same thing on the datasheet&part request sectoin?

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