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MOSFET

MOSFET

MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) are one of the most important types of transistors used in modern electronics. They are used in a variety of applications including power supplies, motor controllers and switching regulators.

The working principle of the MOS transistor is mainly to control the flow of electric current by using the field effect. It has three poles: gate, drain, and source. By applying a voltage between the gate and the source, the current between the drain and the source can be controlled. MOS tubes can be used as circuit elements such as switches or amplifiers.


Working Principle of a MOSFET

A MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is a voltage-controlled switch with three terminals: Gate (G), Drain (D), and Source (S).

  • Applying voltage to the Gate creates an electric field that allows current to flow between Drain and Source.

  • Removing the gate voltage stops the current (for enhancement-mode MOSFETs).

  • N-channel MOSFETs conduct when the gate is positive relative to the source; P-channel MOSFETs conduct when the gate is negative.


MOSFET Types

MOSFET TypeVoltage RangeKey AdvantagesRecommended Applications
Low-Voltage MOSFET≤ 100V- Extremely low RDS(on) for high efficiency- Fast switching speeds for high-frequency applications- Minimal gate drive requirement- Compact packaging for dense PCB designs- DC-DC converters for laptops, smartphones, and low-voltage power supplies- Battery Management Systems (BMS)- Low-voltage load switching and signal control
Super Junction MOSFET100–900V- Ultra-low RDS(on) with high voltage capability- Excellent energy efficiency- High switching speed for high-power density- Reduced thermal stress- High-efficiency power supplies and adapters- Solar inverters and industrial motor drives- Electric vehicle chargers and automotive electronics
Mid-Voltage MOSFET100–500V- Balanced on-resistance and voltage handling- Reliable for industrial and automotive use- Fast switching for PWM-controlled loads- Good thermal stability- Industrial motor controllers and drives- Power inverters and UPS systems- Automotive DC-DC converters and traction inverters


MOSFET Supplier

Hornby Electronic is a leading supplier of MOSFETs and other electronic components. We offer a wide range of MOSFETs at competitive prices with fast and reliable shipping.

  • High Capacity: 6 billion semiconductor devices produced annually

  • Certified Quality: ISO 9001, ISO 14001, TS16949, OHSAS 18001, UL

  • Custom Solutions: OEM/ODM products, custom packaging, and printing

  • Reliable Service: Timely support, real-time problem solving, flexible management

  • Proven Track Record: Trusted by Haier, Huawei, Samsung, TW-Solar, and other global leaders


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