PNP transistor is made up of N material, electrons. This is because without current flowing, electrons are not going into the N-material of the base region. Thus, current can easily flow acrossįrom emitter to collector. Into the base region of a PNP transistor, the base region is very small and offers no real impedement to the flow of current. The next region we must bias is the base region, the most important region for controlling the on-off capability of the transistor. ![]() This makes the holes in the emitter region be repelled by the positive charges. We place positive voltage to the emitter region. And we want current to flow from the emitter to the collector region. The emitter region of a PNP is made up of P material, which are holes. You need to know to understand transistors. This means 2 positive charges will repel each other and 2 negative charges will repel each other, while opposite charges will attract each other. It is the concept that like charges repel each other and opposite charges attract each other. If you know this, you canįigure out how a transistor works. In order to understand how a transistor, there is basically one physics law to understand and that is the law of charges. So we want to bias our circuit so that current flows from the emitter to the collector. ![]() We connect the load we want to power to the collector side, not emitter. It will give out slightly more amplified current than the emitter region. The smaller emitter region to the larger collector region, where the most charge is. Therefore, this is why we want current to go from Region is the largest region which contains the most charge. The end goal is that we want to bias our circuit so that current flows across from the emitter to collector to power the loadīipolar junction transistors, including the PNP transistor, are made so that current should flow from the emitter to the collector region. But to know how to properly bias the transistor, you must know how the transistor is internally constructed.Īs stated before, a PNP transistor is made up of 2 layers of p materials, holes, representing positive charges, sandwiching a middle layer of n material, This is what we are doing now, we are biasing the transistor so that currentĬan flow. However, if a semiconductor is biased properly, meaning voltage is allocatedĪppropriately to the parts of a transistor, then a great amount of current can flow. ![]() A semiconductor is in an intermediate state between a conductor, which allows for the free and easy movement ofĮlectrons and an insulator, which offers great resistance to the flow of electrons.
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