![]() ![]() To turn on a MOSFET, it needs to apply voltage on the gate to source. MOSFET Advantages Over BJT in Switching Converters 4. On the other hand, current controlled means that to set the BJT operation, it needed an amount of current on the base. ![]() Voltage controlled means that to set the MOSFET operation, it needs to have adequate voltage across gate to source. MOSFET is a voltage-controlled device while BJT is a current controlled device. This is also the case for a BJT, there is a voltage drop across collector-emitter. At this operation, MOSFET drain-source voltage is not zero but there is a value depending to the circuit biasing. In this operation mode, both devices will operate in the linear region. Also, the same manner to BJT the voltage across collector-emitter is ideally zero.īoth devices are useful as signal amplifier. At saturation, MOSFET drain to source voltage drop is ideally zero. MOSFET is popular as a switch in which it will operate in cut-off and saturation. MOSFET and BJT Comparison in Terms of Operation Below are circuit symbols for the MOSFET.ģ. It has gate (G), drain (D), and source (S). MOSFET is a three terminal semiconductor device. NMOS is commonly used as low side driver while PMOS is common in high side driving. This is something related to the dominant charge carriers. MOSFET is also either N channel (NMOS) or P channel (PMOS). MOSFET is either depletion or enhancement per construction. In terms of construction, MOSFET and BJT comparison is very different. Comparing MOSFET and BJT in terms of Construction How to Use MOSFET as Reverse Battery ProtectionĢ. On the other hand, MOSFET is widely used as a switch because of easier circuit requirement and analysis required. However, BJT is very much famous compared to MOSFETs. They are both useful as relay drivers, signal inverters, power switch to name few.īoth are also famous in signal amplifiers. Application of MOSFET and BJTīoth MOSFET and BJT are good to use as electronic switches. It is worth to discuss MOSFET and BJT comparison to understand which part to use. BJT on the other hand is bipolar junction transistor. MOSFET is metal oxide semiconductor field effect transistor. Two of the most common three terminal semiconductor nowadays are MOSFET and BJT. ![]()
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