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. Storage and Fall Time Equivalent Test Circuitīelow it's the circuit for connecting a PNP transistor, which 2N3906 functions as a switch or an amplifier.Delay and Rise Time Equivalent Test Circuit.Used for making siren or dual Led or Lamp flasher.
2N3906 PNP BJT breadbard switch circuit build s tep by step Catalog
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