Please forward this error screen to 216. The various parameters are as follows. This is a parameter specific to each hybrid model of transistor pdf, and can be found on a datasheet. This page was last edited on 16 June 2017, at 09:35.
The basic function of a BJT is to amplify current. By convention, the direction of current on diagrams is shown as the direction that a positive charge would move. However, current in many metal conductors is due to the flow of electrons which, because they carry a negative charge, move in the opposite direction to conventional current. On the other hand, inside a bipolar transistor, currents can be composed of both positively charged holes and negatively charged electrons. In this article, current arrows are shown in the conventional direction, but labels for the movement of holes and electrons show their actual direction inside the transistor. The arrow on the symbol for bipolar transistors points in the direction conventional current travels.
PNP transistor comprises two semiconductor junctions that share a thin n-doped region. A discrete transistor has three leads for connection to these regions. BJTs are classified as minority-carrier devices. This allows thermally excited electrons to inject from the emitter into the base region. The physical explanation for collector current is the concentration of minority carriers in the base region.