Because of its fabrication MOSFET’s are available in smaller sizes. These transistors are widely used under the varieties of the applications relating to the amplification and the switching of the devices. If something goes wrong you do not want to kill your cars electrical system on the highway. MOSFET is a metal oxide semiconductor that is under the category of the field-effect transistor (FET). The duration is usually on the order of ns but the more current you push into the gate the faster you push through that region and the less power your MOSFET has to dissipate.Ī DC motor is an inductive load, you will require a flyback diode otherwise you're likely to avalanche your MOSFET which will kill it very quickly.įuses are your friend. For example a 400W resistive load that will mean for a moment 100W will be going directly into the MOSFET when switching.

It gets more complicated with inductive and capcaitive loads but the general idea is important to be aware of. For an instant while switching the impedance of the FET and the load will be equal and so at peak about 1/4 the total power will go directly into the MOSFET. When switching the FET does not instantaneously begin to conduct but instead passes though an ohmic region. In general, the body terminal is connected with the source thus forming a three terminal device just like an FET. It is a semiconductor device which is used for switching and amplification applications in electronic circuits. It's important to switch MOSFETs quickly when using them in power applications. A Metal Oxide Semiconductor Field Effect Transistor (MOSFET) has four terminals Source (S), Gate (G), Drain (D), Body (B). If you plan to use an MCU to switch this you will require some additional circuitry in the form of a gate driver.

The threshold voltage is a little high at 4V so make sure to check the datasheet to find the RDS(on) for your expected operating conditions. Nmos will always have lower RDS(on) than pmos so you should ideally use a low side n-channel mosfet, which is generally the approach that maximizes VGS without bootstrapping or using any kind of gate driver. IRFZ44NPbF is generally the popular choice but assuming this is a DC motor any MOSFET that is rated for the current should really do.

Mosfet what are some uses