功率MOSFET

ST’s power MOSFET portfolio offers a broad range of breakdown voltages from -100 V to 1700 V, with low gate charge and low on-resistance, combined with state-of-the art packaging. ST’s process technology for both high-voltage power MOSFETs (MDmesh™) and low-voltage power MOSFETs (STripFET™) has enhanced power handling capability, resulting in high-efficiency solutions.

The main features of our wide portfolio include:

-100 V to 1700 V breakdown voltage range
More than 30 package options including the 4-lead TO247-4 featuring a dedicated control pin for increased switching efficiency, the H2PAK for high-current capability, the 1-mm-high surface-mount PowerFLAT™ 8x8 HV and the PowerFLAT 5x6 HV and VHV featuring excellent thermal performance thanks to a large exposed metal drain pad
Improved gate charge and lower power dissipation to meet today’s challenging efficiency requirements
Intrinsic fast body diode option for selected product lines
Wide portfolio of automotive-grade power MOSFETs

In each voltage range supporting Industrial and Automotive applications such as Switch Mode Power Supplies (SMPS), Lighting, Motor Control, Energy Generation and Electro Mobility, Chassis & Safety, Body & Convenience, ST has the right power MOSFET for your design.

Automotive MOSFETs in tiny 5x6 mm dual-side cooling package

ST has extended its offering of AEC-Q101 MOSFETs with the introduction of two 40 V devices in the advanced PowerFLAT™ 5x6 dual-side cooling (DSC) package with wettable flanks. The STLD200N4F6AG and STLD125N4F6AG, with a maximum on-resistance of 1.5 mΩ and 3.0 mΩ respectively, ensure high efficiency and help simplify system thermal management. The 0.8 mm-high PowerFLAT 5x6 DSC retains the footprint and thermally efficient bottom-side design of the standard wettable flank package, while it exposes the top-side source electrode to further enhance heat dissipation. This allows a higher current rating that increases power density, enabling designers to build smaller ECUs without trading off functionality, performance, or reliability.

Power MOSFET Basics

MOSFET stands for Metal Oxide Semiconductor Field Effect Transistor. It's a voltage controlled device with 3 terminals:

Gate (electrically insulated from the semiconductor)
Drain
Source

When a voltage applied between the Gate and the Source reaches a certain threshold (V_GS(th) or threshold G-S voltage), the device is able to support current conduction between the Drain and the Source (I_D or drain current).

mosfet structure — MOSFET simplified structure

When a voltage applied between the Gate and the Source is below V_GS(th), the device will withstand a voltage up to BV_DSS (or breakdown voltage).

MOSFETs can be used as a signal amplifier (linear operation) or as a switch in power applications.

MOSFET parameters

Like many other types of semiconductor power switches, the main parameters of a MOSFET, usually available in most datasheets, are:

R_DS(on) (on-state resistance): electrical resistance when the device is set in on state. The lower is R_DS(on), the lower is the conduction loss due to power dissipation when the current is flowing.
BV_DSS (breakdown voltage): maximum drain-to-source voltage that the device is able to sustain when in off state.
Q_G (total gate charge): amount of electric charge required to the gate driver to turn on/off the device itself. Q_G impacts directly the efficiency (the lower, the better).

The product of R_DS(on) and Q_G is known as the MOSFET Figure of Merit (FOM).

Other important parameters are intrinsic capacitances that can affect the switching times and voltage spikes, and body drain diode when device is used as power diode, like in synchronous free-wheeling operation mode.

mosfet parameters — Example of MOSFET datasheet parameters

Learn more about how to read MOSFET datasheet parameters thanks to our series of videos dedicated to "Power MOSFET datasheet parameters".

Main types of power MOSFETs

MOSFETs can be of different types, including:

Depletion Mode: Normally ON. Applying the V_GS would turn it OFF.
Enhancement Mode: Normally OFF. Applying the V_GS would turn it ON.
N-channel MOSFETs: positive voltages and currents.
P-channel MOSFETs: negative voltages and currents.
Low voltage MOSFETs: BV_DSS from 0 V to 200 V.
High voltage MOSFETs: BV_DSS greather than 200 V.

N-channel enhancement-mode MOSFETs are the most popular type used in power switching circuits because of their low R_DS(on) (on-state resistance) compared to P-channel MOSFETs.

mosfet main types — Overview of the main types of MOSFETs

Power MOSFET Applications

Power MOSFETs play an important role in all applications handling Power.

The main applications of high voltage MOSFETs include:

Switch Mode Power Supplies (SMPS)
Residential, commercial, architectural and street lighting
DC-DC converters
Motor control
Automotive applications

ST's high voltage MOSFET portfolio offers a broad range of breakdown voltages up to 1700 V, with low gate charge and low on-resistance, combined with state-of-the-art packaging. ST's MDmesh™ high-voltage MOSFETs technology has enhanced power-handling capability, resulting in high-efficiency solutions.

The main applications of low voltage MOSFETs include:

Switch, buck and synchronous rectification
Uninterruptible Power Supplies (UPS)
Small motor control
Switch Mode Power Supplies (SMPS)
Power-Over-Ethernet (PoE)
Solar inverters
Automotive applications

ST's low voltage MOSFET portfolio offers a broad range of breakdown voltages from -100 V to 120 V, with low gate charge and low on-resistance, combined with state-of-the art packaging.