Okay, let me summarize the differences between BJT and MOSFET. Because of this property, FETs are great for large current flow, and the MOSFET is commonly used as a switch. In a nutshell, a FET is controlled by the Gate-Source voltage applied (which regulates the electrical field across a channel), like pinching or opening a straw and stopping or allowing current flowing. When Gate-Source potential difference is applied, the Drain-Source resistance is reduced, and there will be current flowing through Drain-Source, which is now a closed circuit. When there is no applying voltage between the Gate-Source, the Drain-Source resistance is very high, which is almost like a open circuit, so no current may flow through the Drain-Source. By applying voltage at the gate, it generates an electrical field to control the current flow through the channel between drain and source, and there is no current flow from the gate into the MOSFET.Ī MOSFET may be thought of as a variable resistor, where the Gate-Source voltage difference can control the Drain-Source Resistance. Unlike BJT which is ‘current controlled’, the MOSFET is a voltage controlled device. The MOSFET has “ gate“, “ Drain” and “ Source” terminals instead of a “base”, “collector”, and “emitter” terminals in a bipolar transistor. It is a special type of field-effect transistor (FET).
MOSFET stands for metal-oxide semiconductor field-effect transistor. You can buy MOSFET’s for Arduino Projects on Amazon: What is MOSFET? MOSFET has some advantage and disadvantage over BJT, so choose carefully base on your application. However if you are into how MOSFET work, I will share some useful academic articles and resources at the end of this post.
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