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I have a TIP31c transistor, I need a 2N2222 for an Arduino project to drive small dc motors with PWM, I found both transistors are NPN, but I don't want to hurt my Arduino, is the swap possible?

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It should work if you get the pinning correct. The TIP31C is generally going to be lower current gain than the 2N2222 so it will require a higher base current for a given load.

If your small motor load is a low current device truly compatible with the ratings of the 2N2222 then I see no reason that would keep you from trying the TIP31C.

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