Once it is saturated, then the potential drop across the Vce is about 200 mV. The switching speed of the MOSFET is higher When the MOSFET is saturated then less heat dissipation can occur. When the BJT is saturated then less heat dissipation can occur. It has a high current gain which is almost stable for changing drain currents. If the temperature increases then the gain can also be increased. Once the collector current increases then the gain can be decreased. It has low current gain & it is not stable. In MOSFET, Electrostatic Discharge is an issue, so it can cause a problem. In BJT, Electrostatic Discharge is not a problem. The current output of the MOSFET can be controlled through the i/p gate voltage. The current output of the BJT can be controlled through the i/p base current. The temperature coefficient of MOSFET is positive The temperature coefficient of BJT is negative So the similarities between BJT and MOSFET are discussed below. The difference between BJT and MOSFET in tabular form is discussed below. MOSFET Block Diagram Differences between BJT and MOSFET BJTs are apt for low current applications like switching purposes. The operating principles of these transistors are practically equal and the main difference is in biasing as well as the polarity of the power supply for each type. In the PNP transistor, P stands for positive and the majority charge carriers are holes whereas in the NPN transistor, N stands for negative and the majority charge carriers are electrons. The main difference between BJT and MOSFET is their charge carriers. There are two kinds of transistors namely PNP and NPN.
The two regions are named the P-junction and N-junction. Actually, a BJT is a silicon piece that includes three regions and two junctions. This transistor consists of three terminals namely the emitter, base, and collector. Fundamentally, the operation of a BJT transistor is determined by the current at the base terminal. The BJT is a current-controlled device where the o/p of the base terminal or emitter terminal is a function of the current in the base terminal. A bipolar junction transistor is one type of semiconductor device and in the olden days, these devices are used in the place of vacuum tubes.
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