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How do you identify the transistor wheather npn or pnp?

In: Electronics Engineering [Edit categories]

Answer:

You can use a ohmmeter, assuming the ohmmeter presents more than 0.7 volts in the open circuit state.

If you know which pin is the base, put the plus lead on it and check the emitter and collector. If you have continuity, the device is NPN. If not, reverse the leads, and if you now have continuity, the device is PNP.

If you don't know which lead is the base, or you want a general go/nogo check of the transistor, connect the ohmmeter in all nine configurations. You should find continuity in only two configurations. Of these two configurations, if the common lead is the plus lead, the device is NPN, otherwise it is PNP. This will also identify the base. (Unfortunately, you cannot identify the collector or emitter using this technique.)

First answer by Alex146. Last edit by Alex146. Contributor trust: 419 [recommend contributor ]. Question popularity: 1 [recommend question].

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