MOSFETs are in stock with same-day shipping at Mouser Electronics from industry leading manufacturers. Mouser is an authorized distributor for many MOSFET manufacturers including Diodes Inc., Infineon, IXYS, Microchip, Nexperia, ON Semiconductor, STMicroelectronics, Texas Instruments, Vishay, & more. MOSFET stands for Metal Oxide Silicon Field Effect Transistor or Metal Oxide Semiconductor Field Effect Transistor. This is also called as IGFET meaning Insulated Gate Field Effect Transistor. The FET is operated in both depletion and enhancement modes of operation. The following figure shows how a practical MOSFET looks like. The MOSFET must not be exposed to conditions outside the safe operating area even for an instant. Conventionally, MOSFETs were known for the absence of secondary breakdown, which was a failure mode specific to bipolar transistors. The safe operating area of a MOSFET was bound only by the maximum drain-source voltage.
Metal Oxide Silicon Field Effect Transistors commonly known as MOSFETs are electronic devices that are used to switch or amplify voltages in circuits. It is a current controlled device and is constructed by three terminals. The terminals of MOSFET are named as follows. MOSFET Basics MOSFET Types MOSFET Operating Regions MOSFET as a Switch MOSFET Applications MOSFETs or Metal Oxide Silicon Field Effect Transistors were invented to overcome the disadvantages posed by FETs, such as the slow operation, high drain resistance, and moderate input impedance.
Infineon’s OptiMOS™ and StrongIRFET™ 25V to 250V power MOSFET bare die families address a broad range of needs from low to high switching frequency applications.
OptiMOS™ bare dies combine very low on-state resistance (RDS(on)) and fastest switching behavior, providing outstanding performance to a wide range of industrial and consumer applications. StrongIRFET™ bare dies are optimized for low RDS(on) and high current capability and is ideally suited for low frequency applications requiring performance and ruggedness.
- Suitable for die bond: soldered or glued
- Backside metallization: NiAg system
- Frontside metallization: AICu system
- Passivation: imide (only on edge structure)
For more information regarding StrongIRFET™ and OptiMOS™ power MOSFET bare die products, please contact the Infineon Service Center or your local Sales counterpart.
A N-Channel MOSFET is a type of MOSFET in which the channel of the MOSFET is composed of a majority of electrons as current carriers. When the MOSFET is activated and is on, the majority of the current flowing are electrons moving through the channel.
This is in contrast to the other type of MOSFET, which are P-Channel MOSFETs, in which the majority ofcurrent carriers are holes.
Before, we go over the construction of N-Channel MOSFETs, we must go over the 2 types that exist. There are 2 types of N-Channel MOSFETs, enhancement-type MOSFETs and depletion-type MOSFETs.
A depletion-type MOSFET is normally on (maximum current flows from drain to source) when no differencein voltage exists betweeen the gate and source terminals. However, if a voltage is applied to its gate lead, the drain-source channel becomes more resistive, until the gate voltage is so high, the transistor completely shuts off. An enhancement-type MOSFET is the opposite. It is normally off when the gate-source voltage is 0(VGS=0). However, if a voltage is applied to its gate lead, the drain-source channel becomesless resistive.
In this article, we will go over how both N-Channel enhancement-type and depletion-type are constructed and operate.
How N-Channel MOSFETs Are Constructed Internally
An N-Channel MOSFET is made up of an N channel, which is a channel composed of a majority of electron current carriers. The gate terminals are made up of P material. Depending on the voltage quantity and type (negative or positive)determines how the transistor operates whether it turns on or off.
How an N-Channel Enhancement type MOSFET Works
How to Turn on a N-Channel Enhancement type MOSFET
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To turn on a N-Channel Enhancement-type MOSFET, apply a sufficient positive voltage VDD to the drain of the transistorand a sufficient positive voltage to the gate of the transistor. This will allow a current to flow through the drain-source channel.
So with a sufficient positive voltage, VDD, and sufficient positive voltage applied to the gate, the N-Channel Enhancement-type MOSFET is fully functional and is in the 'ON' operation.
How to Turn Off an N-Channel Enhancement type MOSFET
To turn off an N-channel Enhancement MOSFET, there are 2 steps you can take. You can either cut off the bias positivevoltage, VDD, that powers the drain. Or you can turn off the positive voltagegoing to the gate of the transistor.
How a N-Channel Depletion-type MOSFET Works
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How to Turn on an N-Channel Depletion-Type MOSFET
To turn on an N-channel Depletion-type MOSFET, to allow for maximum current flow from drain to source, the gate voltage should be set to 0V. When the gate voltage is at 0V, the transistor conducts the maximum amount of current and is in the active ON region. To reducethe amount of current that flows from the drain to source, we apply a negative voltage to the gate of the MOSFET. As the negative voltage increases (gets more negative), less and less current conducts across from the drain to the source. Once the voltage at the gate reaches a certain point, all current ceases to flowfrom the drain to the source.
So with a sufficient positive voltage, VDD, and no voltage (0V) applied to the base, the N-channel JFET is in maximum operation and has the largest current. As we increase the negative voltage, current flows gets reduced until the voltage is so high (negative), that all current flow is stopped.
How to Turn Off an N-Channel Depletion-type MOSFET
To turn off the N-channel Depletion-type MOSFET, there are 2 steps you can take. You can either cut off the bias positivevoltage, VDD, that powers the drain. Or you can apply sufficient negative voltage to the gate. When sufficientvoltage is applied to the gate, the drain current is stopped.
MOSFET transistors are used for both switching and amplifying applications. MOSFETs are perhaps the most popular transistors used today. Their high input impedance makes them draw very little input current, they are easy to make, can be made very small, and consume very little power.
Related Resources
How to Build an N-Channel MOSFET Switch Circuit
P Channel MOSFET Basics
N Channel JFET Basics
P Channel JFET Basics
Types of Transistors