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MOSFETs, also known as MOSFET transistors, stands for ’Metal Oxide Semiconductor Field-Effect Transistors’. MOSFETs are transistor devices which are controlled by a capacitor. The "Field-Effect" means that they are controlled by voltage. The aim of a MOSFET is to control the flow of the current passing through from the source to the drain terminals. It acts very similarly to a switch and is used for switching or amplifying electronic signals.

These semiconductor devices are ICs (integrated circuits) which are mounted onto PCBs. MOSFETs come in a range of standard package types such as DPAK, D2PAK, DFN, I2PAK, SOIC, SOT-223 and TO-220. For more information, please see our [guide to MOSFETs](/web/content/discovery/ideas-and-advice/mosfet-guide).

### What are depletion and enhancement modes?

MOSFET transistors have two modes; depletion and enhancement. Depletion MOSFETs work like a closed switch. The current passes through when no current is applied. The current flow will stop if a negative voltage is applied. Enhancement mode MOSFETs are like a variable resistor and are generally more popular than the depletion mode MOSFETs. They come in n-channel or p-channel variants.

### How do MOSFETs work?

The pins on a MOSFET package are the Source, Gate and Drain. When a voltage is applied between the Gate and the Source terminals, current can pass through from the Drain to the Source pins. When the voltage applied to the Gate changes, the resistance from the Drain to the Source will change too. The lower the voltage applied, the higher the resistance. As the voltage increases, the resistance from the Drain to Source will decrease. Power MOSFETs are like standard MOSFETs but they are designed to handle a higher level of power.

### N-Channel vs. P-Channel MOSFETs

**N-Channel** MOSFETs contain additional electrons which are free to move around. They are a more popular channel type. N-Channel MOSFETs work when a positive charge is applied to the gate terminal.

**P-Channel** MOSFETS substrate contains electrons and electron holes. P-Channel MOSFETs are connected to a positive voltage. These MOSFETs turn on when the voltage supplied to the Gate terminal is lower than the Source voltage.



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MOSFETs | N-Channel | P-Channel | RS

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OptiMOS™ MOSFETs | RS

<p>OptiMOS&trade; refers to a family of power MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) developed by Infineon Technologies. These MOSFETs are designed for high efficiency and performance in power management applications. They are commonly used in various electronic devices and systems that require efficient power conversion, such as power supplies, DC-DC converters, motor control circuits, and more.</p><h2>OptiMOS&trade; MOSFETs features include:</h2><ul><li>Low On-Resistance (RDS(on)) - this minimises conduction losses and improves efficiency.</li><li>Fast Switching Speed - enhances the performance in high-frequency applications.</li><li>Low Gate Charge (Qg) - reduces the power loss in driving the gate.</li><li>High Power Density - allows for more compact and efficient designs.</li></ul><p>OptiMOS&trade; MOSFETs are part of Infineon's portfolio aimed at providing solutions for energy-efficient electronics, supporting a wide range of voltage classes and packaging options to suit different application needs.</p>

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SIPMOS® MOSFETs | RS

<p>SIPMOS&reg; refers to a series of power MOSFETs produced by Infineon Technologies. The term "SIPMOS" stands for "Silicon Power MOSFET," and these devices are designed to offer efficient power management solutions with robust performance. SIPMOS&reg; MOSFETs are commonly used in a variety of applications, including industrial electronics, automotive systems, power supplies, and consumer electronics.</p><h2>SIPMOS&reg; MOSFETs features include:</h2><ul><li>High Efficiency - these MOSFETs are designed to minimise conduction and switching losses, leading to improved overall system efficiency.</li><li>Robust Performance - SIPMOS&reg; devices are known for their reliability and durability in demanding applications.</li><li>Wide Range of Voltages and Currents - SIPMOS&reg; MOSFETs cover a broad spectrum of voltage and current ratings, making them versatile for different use cases.</li><li>Fast Switching Speed - these MOSFETs are optimised for high-frequency switching applications.</li></ul>

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CoolMOS™ MOSFETs | RS

<p>CoolMOS MOSFETS are a type of power MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor)&nbsp; developed by Infineon Technologies. Infineon offers a wide variety of high quality and reliable CoolMOS devices with different voltage ratings and package options to suit different needs.&nbsp;</p><p>The key feature of CoolMOS is that they are superjunction MOSFETs. This means they have a special design that allows them to achieve very low on-resistance (RDS(on)) while also being able to handle high voltages. Low RDS(on) is important for efficiency, as it&nbsp; means the device wastes less energy as heat when conducting electricity.&nbsp; This makes CoolMOS MOSFETS ideal for a variety of applications where efficiency is important, such as:</p><ul><li>Switch-mode power supplies</li><li>Solar inverters</li><li>LED drivers</li><li>Motor drives</li></ul>

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HEXFET MOSFETs | RS

<p>HEXFET MOSFETs are a type of power MOSFET technology from Infineon Technologies. The name "HEXFET" is derived from the hexagonal cell design used in the structure of these MOSFETs, which optimises the use of silicon area and improves performance. HEXFET MOSFETs are widely recognised for their efficiency, ruggedness, and reliability, making them suitable for a broad range of power management applications.</p><h2>HEXFET MOSFETs features include:</h2><ul><li>Low On-Resistance (Rds(on)) which minimises conduction losses and improves overall efficiency.</li><li>High Current Capability due to the hexagonal cell design</li><li>Fast Switching Speed - which is essential for high-frequency applications and helps in reducing switching losses.</li><li>Ruggedness - designed to withstand harsh electrical environments, offering high robustness against voltage spikes and transients.</li><li>Efficient thermal management, allowing for better heat dissipation and operation at higher temperatures.</li><li>Ease of Use - these MOSFETs are available in a variety of packages and voltage ratings, making them versatile and easy to integrate into different designs.</li></ul><h2>HEXFET MOSFETs Applications:</h2><ul><li>Power Supplies</li><li>Motor Control</li><li>Automotive</li><li>Battery Management</li><li>Lighting</li><li>Audio Amplifiers</li></ul><p>HEXFET MOSFETs series include:</p><ul><li>IRL and IRF Series - known for their wide range of voltage ratings and package options. They are widely used in general-purpose power management and motor control applications.</li><li>IRLB and IRLZ Series - offer logic-level gate drive capability, making them suitable for applications where the MOSFET is driven directly by microcontrollers or logic circuits.</li><li>Automotive HEXFETs - designed to meet requirements of automotive applications, including AEC-Q101 qualification for enhanced reliability and robustness.</li></ul><p>HEXFET MOSFETs remain a popular and reliable choice for many applications due to their established design and good balance of features.</p>

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CoolSiC™ MOSFETs | RS

<p>CoolSiC&trade; MOSFETs are a series of silicon carbide (SiC) power transistors developed by Infineon Technologies. These devices leverage the superior electrical properties of silicon carbide compared to traditional silicon (Si) to offer significant performance improvements, especially in high-power and high-efficiency applications.</p><h2>CoolSiC&trade; MOSFETs features include:</h2><ul><li>High Efficiency - exhibit lower conduction and switching losses than silicon-based MOSFETs, leading to higher overall system efficiency.</li><li>High Switching Frequencies - the fast switching capabilities of SiC technology enable higher operating frequencies, which can reduce the size and weight of passive components such as inductors and capacitors.</li><li>High Temperature Operation - SiC devices can operate at higher temperatures compared to their silicon counterparts, which reduces the need for extensive cooling and allows for more compact designs.</li><li>Robustness and Reliability even under harsh conditions.</li><li>Low On-Resistance - they have a significantly lower on-resistance (Rds(on)) compared to silicon MOSFETs, which reduces conduction losses and improves efficiency.</li></ul><h2>Applications of CoolSiC&trade; MOSFETs</h2><p>CoolSiC&trade; MOSFETs are suitable for a wide range of applications, particularly where efficiency, thermal performance, and high power density are crucial. Common applications include:</p><ul><li>Power Supplies - used in switch-mode power supplies (SMPS), server power supplies, and telecom power systems</li><li>Renewable Energy Systems</li><li>Industrial Drives</li><li>Electric Vehicle (EV) Systems</li><li>Integrated into uninterruptible power supplies (UPS</li></ul><p>CoolSiC&trade; MOSFETs represent a significant advancement in power semiconductor technology, offering superior efficiency, high temperature operation, and robustness compared to traditional silicon-based MOSFETs. These characteristics make them highly suitable for demanding applications iwhere performance and reliability are critical.</p>

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StrongIRFET MOSFETs | RS

<p>StrongIRFET MOSFETs are a series of power MOSFETs developed by Infineon Technologies, designed to provide high performance, robustness, and reliability for industrial applications. These MOSFETs are known for their high current carrying capability, low on-resistance, and rugged design, making them suitable for a variety of demanding applications.</p><h2>StrongIRFET MOSFETs features include:</h2><ul><li>Low On-Resistance (Rds(on)) - feature very low on-resistance, which reduces conduction losses and improves efficiency, particularly important in high-current applications.</li><li>High Current Capability - making them ideal for applications like motor drives and power tools.</li><li>Ruggedness - built to withstand harsh electrical and environmental conditions, offering robustness against voltage spikes, high temperatures, and mechanical stress.</li><li>Excellent thermal performance, allowing for effective heat dissipation and reliable operation under high power conditions.</li><li>Available in a variety of standard packages, are easy to integrate into existing designs</li></ul><h2>Popular StrongIRFET MOSFET Series</h2><ul><li>40V StrongIRFET MOSFETs -known for their high current capability and low on-resistance, suitable for applications like motor control and power tools.</li><li>60V StrongIRFET MOSFETs - offer a balance between voltage rating and on-resistance, ideal for power supplies and battery management systems.</li><li>100V and Above StrongIRFET MOSFETs - suitable for higher voltage applications such as solar inverters and industrial automation systems.</li></ul>

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Infineon MOSFETs | RS

<p>Infineon MOSFETs are semiconductor devices used for switching and amplifying electronic signals in a variety of applications. Infineon Technologies is a prominent semiconductor manufacturer and their MOSFETs are widely used in various electronic applications due to their high performance, reliability, and efficiency.</p><h2>Why Use Infineon MOSFETs?</h2><ul><li>Power Efficiency - Infineon MOSFETs offer excellent power efficiency due to their low on-resistance and low gate charge, which minimises conduction and switching losses.</li><li>High Performance - they provide high-speed switching capabilities, making them suitable for applications in power management, motor control, and RF amplification.</li><li>Robustness and Reliability - Infineon&rsquo;s rigorous quality control and advanced manufacturing processes ensure that their MOSFETs are highly reliable and durable.</li><li>Thermal Management - advanced packaging and low thermal resistance make them ideal for high-power applications where heat dissipation is critical.</li><li>Wide Range - Infineon offers a broad portfolio of MOSFETs tailored for different applications, from automotive to consumer electronics.</li></ul><h2>Popular Infineon MOSFET Series include:</h2><ul><li>OptiMOS&trade; - designed for high efficiency and performance in power management applications, including DC-DC converters, synchronous rectification, and load switching.</li><li>OptiMOS&trade; 5 - very low on-resistance and gate charge, making them ideal for high-frequency switching applications.</li><li>OptiMOS&trade; 6 - suitable for applications in server, telecom, and industrial power supplies.</li><li>StrongIRFET&trade; - Targeted at industrial applications, these MOSFETs are known for their ruggedness and reliability.</li><li>CoolMOS&trade; - high-voltage MOSFETs used in applications requiring high efficiency and power density, such as power supplies and inverters.</li><li>CoolMOS&trade; C7 - Features ultra-low switching losses and high efficiency, suitable for high-power applications.</li><li>CoolMOS&trade; P7 - Designed for ease of use and high efficiency, targeted at low- to mid-power applications.</li><li>Automotive MOSFETs - specifically designed for automotive applications, complying with AEC-Q101 standards.</li></ul><p>Infineon&rsquo;s extensive range of MOSFETs ensures that designers can find a suitable component for almost any application, from consumer electronics to industrial and automotive systems.</p>

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N Channel Mosfets | RS

<p>A range of N-Channel MOSFETs from leading brands including our own trusted brand RS Pro. N-Channel MOSFETs are a popular channel type and contain additional electrons which are free to move around. N-Channel MOSFETs work when a positive charge is applied to the gate terminal.</p>

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P Channel Mosfets | RS

<p>A range of P-Channel MOSFETS from leading brands. P-Channel MOSFETS have a channel which is composed of a majority of hole current carriers. P Channel MOSFETs turn on when the voltage supplied to the Gate terminal is lower than the Source voltage.</p>

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