![]() In the PNP transistor, by default, it’s in ON state, but not to be said perfectly ON until the base pin is not grounded. When used as a switch, it can be operated in the saturation region and cut-off region. The 2N3906 transistor is commonly used as a switching device. So if you looking for a PNP transistor that could switch high voltage loads within 0.2A then this 2N3906 transistor might be the right choice for you. This transistor has only a gain value of 300, hence not suitable for amplifier circuits. It is very much similar to the bc557 transistor except that it has a high collector to emitter voltage and hence high voltage loads can be toggled. The 2N3906 is a commonly used PNP transistor. This is because the base voltage will be greater than the emitter voltage, which blocks current flow.Īnd this is how a basic PNP transistor circuit works. However, if the push button is pressed, the transistor will turn off and the LED will shut off. ![]() Therefore, the LED connected to the collector of the PNP transistor will be on. Unless it is pressed, normally no current flows into the base of the transistor. And a normally open pushbutton is connected to the base of the transistor. So +3V is connected to the emitter of the transistor.
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