Transistors - FETs, MOSFETs

Transistors - FETs, MOSFETs - Single

Part Number	Description / PDF	Quantity
STW33N60DM2 STMicroelectronics	MOSFET N-CH 600V 24A TO247	0
STD5N20LT4 STMicroelectronics	MOSFET N-CH 200V 5A DPAK	3998
STFU9N65M2 STMicroelectronics	MOSFET N-CH 650V 5A TO220FP	0
STW20N90K5 STMicroelectronics	MOSFET N-CH 900V 20A TO247	0
STD96N3LLH6 STMicroelectronics	MOSFET N-CH 30V 80A DPAK	1034
STP50NF25 STMicroelectronics	MOSFET N-CH 250V 45A TO220AB	4567
STD52P3LLH6 STMicroelectronics	MOSFET P-CH 30V 52A DPAK	1718
STU5N52K3 STMicroelectronics	MOSFET N-CH 525V 4.4A IPAK	0
STB4NK60ZT4 STMicroelectronics	MOSFET N-CH 600V 4A D2PAK	2329
STP18N60M2 STMicroelectronics	MOSFET N-CH 600V 13A TO220	948
STF11N50M2 STMicroelectronics	MOSFET N-CH 500V 8A TO220FP	0
SCTW100N65G2AG STMicroelectronics	SICFET N-CH 650V 100A HIP247	1549
STB9NK80Z STMicroelectronics	MOSFET N-CH 800V 5.2A D2PAK	0
STP3N80K5 STMicroelectronics	MOSFET N-CH 800V 2.5A TO220	919
STL4N10F7 STMicroelectronics	MOSFET N-CH 100V 4.5/18A PWRFLAT	2755
STD2NK90ZT4 STMicroelectronics	MOSFET N-CH 900V 2.1A DPAK	1656
STD7N60M2 STMicroelectronics	MOSFET N-CH 600V 5A DPAK	5100
STW9NK95Z STMicroelectronics	MOSFET N-CH 950V 7A TO247	42
STU3LN80K5 STMicroelectronics	MOSFET N-CHANNEL 800V 2A IPAK	2932
STB85NF55LT4 STMicroelectronics	MOSFET N-CH 55V 80A D2PAK	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