The technical characteristics and applicable scenarios of different types of MOSFETs vary significantly. The following is a summary of the mainstream classification dimensions:

Divided by channel type
N-channel MOSFET
Technical features: The electron mobility is much higher than that of holes, and the conduction resistance is lower and the switching speed is faster under the same size, making it the mainstream choice in the current market; The conduction condition is that the gate source voltage VGS is greater than the positive threshold voltage, and the driving logic is simple.
Applicable scenarios: Low voltage and high current DC-DC converters, industrial motor drives, vehicle power supplies, high-power fast charging, and most other power switch scenarios. For example, the SL18N20 with 200V/18A specifications can be directly adapted to mainstream PWM controllers without the need for additional level conversion circuits.

P-channel MOSFET
Technical features: Using holes as carriers, with a transconductance lower than that of N-channel devices of the same specifications, a higher absolute threshold voltage, and a gate source voltage VGS lower than the negative threshold for conduction; Naturally adapted to high-end driving scenarios, without the need for complex bootstrap circuits.
Applicable scenarios: Power path management for battery powered equipment, high-end load switches, anti reverse protection circuits, especially suitable for simple drive architectures where the source is directly connected to VCC.

Divided by working mode
Enhanced MOSFET
Technical features: When VGS=0V, the device is completely turned off, and a gate voltage exceeding the threshold must be applied to form a conductive channel. It is the most commonly used type in commercial circuits, and the driving logic is safe and reliable.
Applicable scenarios: In all conventional switching power supplies, motor control, digital circuit power switches, and other scenarios, the default turn off feature when powered on can avoid the risk of misleading power on.

Depletion MOSFET
Technical features: When VGS=0V, the channel is naturally conductive and belongs to the "normally open" type of device, which requires the application of negative gate voltage to turn off; Equipped with an extended forward biased safe working area, it can operate stably in the linear region.
Applicable scenarios: special scenarios such as switch mode power supply startup circuit, surge protection, constant current source, high-voltage auxiliary power supply, etc. Replacing traditional startup resistors can reduce standby power consumption to almost zero and greatly improve power efficiency.

Divided by core process structure
Flat MOSFET
Technical features: The gate is horizontally arranged on the surface of the chip, the process is mature and reliable, the voltage resistance is strong, and the long-term stability is excellent.
Applicable scenarios: High voltage industrial power supplies above 600V, traditional linear regulator circuits, and industrial control scenarios that require extremely high reliability.

Trench MOSFET
Technical features: By etching vertical grooves on silicon wafers to form gates, the channel density per unit area is significantly increased, and the on resistance is reduced by more than 30% compared to planar structures, making it cost-effective.
Applicable scenarios: Low voltage and high current scenarios below 200V, such as consumer power supplies, power tools, BLDC motor drives, etc., are the mainstream processes in the current consumer electronics field.

Shielded Gate Trench (SGT) MOSFET
Technical features: Introducing shielding electrodes at the bottom of the trench to offset gate drain capacitance, significantly optimizing switch performance, reducing EMI interference, is a performance upgrade version of Trench MOS.
Applicable scenarios: high-frequency fast charging, server power supply, high-density DC-DC modules, and other scenarios that require high switching speed and electromagnetic compatibility.

Super junction (SJ) MOSFET
Technical features: Adopting an alternating P/N pillar structure to replace the traditional uniformly doped drift region, breaking through the performance limit of silicon-based "on resistance withstand voltage", and balancing high withstand voltage and low conduction loss.
Applicable scenarios: High voltage and efficient energy conversion scenarios such as 500V-900V high-voltage switching power supplies, photovoltaic inverters, charging pile modules, etc.

Silicon carbide (SiC) MOSFET
Technical features: Using wide bandgap silicon carbide material, it can comprehensively crush silicon-based devices in terms of voltage resistance, temperature resistance, and switching frequency. The FOM (quality factor) is extremely low, and the switching loss can be reduced by more than 70%.
Applicable scenarios: New energy vehicle inverters, high-voltage energy storage systems, 800V fast charging piles, high-frequency industrial power supplies and other cutting-edge and efficient scenarios are the core development direction of the next generation of power semiconductors.