Transistors - FETs, MOSFETs

Transistors - FETs, MOSFETs - Single

Part Number	Description / PDF	Quantity
STB30N65M2AG STMicroelectronics	MOSFET N-CH 650V 20A D2PAK	0
STP100N6F7 STMicroelectronics	MOSFET N-CH 60V 100A TO220	0
STS5NF60L STMicroelectronics	MOSFET N-CH 60V 5A 8SO	4
STP80NF12 STMicroelectronics	MOSFET N-CH 120V 80A TO220AB	1625
STB75NF75LT4 STMicroelectronics	MOSFET N-CH 75V 75A D2PAK	23
STL285N4F7AG STMicroelectronics	MOSFET N-CH 40V 120A POWERFLAT	0
STW6N95K5 STMicroelectronics	MOSFET N-CH 950V 9A TO247-3	495
STB11NM60FDT4 STMicroelectronics	MOSFET N-CH 600V 11A D2PAK	0
STP120N4F6 STMicroelectronics	MOSFET N-CH 40V 80A TO220AB	76
STH180N10F3-2 STMicroelectronics	MOSFET N-CH 100V 180A H2PAK-2	1772
STW36N55M5 STMicroelectronics	MOSFET N-CH 550V 33A TO247	0
STB6NK60ZT4 STMicroelectronics	MOSFET N-CH 600V 6A D2PAK	862
STW20N95DK5 STMicroelectronics	MOSFET N-CH 950V 18A TO247	86
STH315N10F7-2 STMicroelectronics	MOSFET N-CH 100V 180A H2PAK-2	0
STK800 STMicroelectronics	MOSFET N-CH 30V 20A POLARPAK	0
STW56N60M2-4 STMicroelectronics	MOSFET N-CH 600V 52A TO247-4L	386
STW24N60DM2 STMicroelectronics	MOSFET N-CH 600V 18A TO247	90
STW7N105K5 STMicroelectronics	MOSFET N-CH 1050V 4A TO247	0
SCT30N120H STMicroelectronics	SICFET N-CH 1200V 40A H2PAK-2	1006
STF5N52K3 STMicroelectronics	MOSFET N-CH 525V 4.4A TO220FP	0

Transistors - FETs, MOSFETs - Single

1. Overview

Field-Effect Transistors (FETs) and Metal-Oxide-Semiconductor FETs (MOSFETs) are voltage-controlled semiconductor devices that regulate current flow through an electric field. As fundamental components in modern electronics, they offer advantages such as high input impedance, low power consumption, and fast switching capabilities. Single discrete FETs/MOSFETs are widely used in power management, signal amplification, and switching applications across industries.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Junction FET (JFET)	Voltage-controlled depletion mode operation, low noise	Low-noise amplifiers, analog switches
Enhancement Mode MOSFET	Normally-off device, requires positive V_GS to conduct	Power supplies, motor drives
Depletion Mode MOSFET	Normally-on device, requires negative V_GS to block	Radio frequency amplifiers, load switches
Insulated Gate Bipolar Transistor (IGBT)	Combines MOSFET input with bipolar output, high current capacity	High-power industrial equipment, electric vehicles

3. Structure and Composition

A typical MOSFET structure includes three terminals: Source, Gate, and Drain. The gate is insulated by a thin layer of silicon dioxide (SiO₂), forming a capacitive control interface. The channel between source and drain is formed in a silicon substrate. Advanced devices use materials like silicon carbide (SiC) or gallium nitride (GaN) for higher performance. Packaging options include TO-220, DPAK, and SOT-23 for different thermal and space requirements.

4. Key Technical Specifications

Parameter	Description and Importance
V_DS (Drain-Source Voltage)	Maximum voltage rating between drain and source; determines breakdown tolerance
I_D (Drain Current)	Maximum continuous current capacity; critical for power handling
R_DS(on)	On-state resistance; impacts conduction losses and efficiency
V_GS(th) (Threshold Voltage)	Voltage required to form channel; determines control signal compatibility
Q_G (Gate Charge)	Charge required for switching; affects switching speed and driver requirements
P_D (Power Dissipation)	Maximum power handling capability; dictates thermal management needs

5. Application Fields

Consumer Electronics: Mobile phone chargers, notebook power adapters
Industrial: Motor drives, uninterruptible power supplies (UPS)
Automotive: Electric vehicle (EV) battery management systems, HEV inverters
Telecommunications: Base station power amplifiers, optical network transceivers
Renewable Energy: Solar micro-inverters, wind turbine converters

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Texas Instruments	CSD18534Q5A	60V, 4.2m R_DS(on), automotive-grade
STMicroelectronics	STP55NF06	55A, 60V, high-speed switching
Infineon Technologies	IPB041N06N3	0.41 , 600V, TO-220 package
ON Semiconductor	NDS355AN	Depletion mode, 300mA, RF applications

7. Selection Guidelines

Key considerations include:

Voltage and current requirements under operating conditions
Thermal performance (R_DS(on), package thermal resistance)
Switching speed vs. conduction loss trade-off
Gate drive compatibility with control circuitry
Environmental factors (temperature, vibration, humidity)
Cost-performance balance for volume production

8. Industry Trends

Current trends include:

Adoption of wide bandgap materials (SiC, GaN) for higher efficiency
Advanced packaging technologies (double-sided cooling, copper clip)
Integration with gate drivers and protection circuits
Miniaturization through trench and shielded gate structures
Development of automotive-qualified devices for EVs and ADAS