The operation of MOSFET depends on the voltage at the oxide-insulated gate electrode, while the operation of BJT is dependent on the current at the base. In digital and analog circuits, MOSFETs are considered to be more commonly used than BJTs these days.ĥ. BJTs are preferred for low current applications, while MOSFETs are for high power functions.Ĥ. A BJT has an emitter, collector and base, while a MOSFET has a gate, source and drain.ģ. BJT is a Bipolar Junction Transistor, while MOSFET is a Metal Oxide Semiconductor Field-Effect Transistor.Ģ. MOSFETs, nowadays, are the most common transistor used in digital and analog circuits, replacing the then very popular BJTs.ġ. What’s great about MOSFETs is that they handle power more efficiently. In this transistor, a voltage on an oxide-insulated gate electrode can generate a channel for conduction between the other contacts ‘“ the source and drain. This current flow may be pinched-off, or opened, by the voltage on the gate. The savings resulting from exchanging the MOSFET bypass transistor and Schottky Diode with a Low VCEsat BJT and bias resistor were 0.075 per unit. This allows a flow of current between the source and the drain. However, there’s a field produced by a voltage on the gate. Unlike the BJT, there is no base current present. Metal Oxide Semiconductor Field-Effect Transistor, or simply MOSFET, and sometimes MOS transistor, is a voltage-controlled device. Many prefer BJTs for low current applications, like for switching purposes for instance, simply because they’re cheaper. The operation principles of the two BJT transistors, PNP and NPN, are practically identical the only difference is in biasing, and the polarity of the power supply for each type. The types differ in their charge carriers, wherein, NPN has holes as its primary carrier, while PNP has electrons. There two type of BJTs, the NPN transistor and the PNP transistor. There are two junctions in them where each region is named differently ‘“ the P and N. The three terminals of a BJT transistor are called the Emitter, Collector and Base.Ī BJT is actually a piece of silicon with three regions. Basically, the mode of operation of a BJT transistor is driven by the current at the base. The contraption is a current-controlled device where the collector or emitter output is a function of the current in the base. Yet, they have significantly different characteristics.īJT, as in Bipolar Junction Transistor, is a semiconductor device that replaced the vacuum tubes of the old days. The transistors BJT and MOSFET are both useful for amplification and switching applications.
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