Transistors - FETs, MOSFETs

Transistors - FETs, MOSFETs - Single

Image	Part Number	Description / PDF	Quantity	Rfq
	AO3406L_107 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 30V 3.6A SOT23-3	0
	AOD5T40P_101 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 400V 3.9A TO252	0
	AOD446_001 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 75V TO-252	0
	AO3406L_106 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 30V 3.6A SOT23-3	0
	AON7410L_105 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 30V 8A/20A 8DFN	0
	AOD3C60 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 600V 3A TO252	0
	AO3414L Alpha and Omega Semiconductor, Inc.	MOSFET N-CHANNEL 20V 3A SOT23-3	0
	AO6085N03 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 30V 11A/50A 8DFN	0
	AOI4146 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 30V 15A/55A TO251A	0
	AO3401L_101 Alpha and Omega Semiconductor, Inc.	MOSFET P-CH 30V 4.2A SOT23-3	0
	AOI514 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 30V 17A/46A TO251A	0
	AOL1458 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 30V 14A/46A ULTRASO8	0
	AON6440 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 40V 20A/85A 8DFN	0
	AON6734 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 30V 37A/85A 8DFN	0
	AON2407 Alpha and Omega Semiconductor, Inc.	MOSFET P-CH 30V 6.3A 6DFN	0
	AO4446 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 30V 15A 8SOIC	0
	AOD2HC60 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 600V 2.5A TO252	0
	AO7403_001 Alpha and Omega Semiconductor, Inc.	MOSFET P-CH 20V 700MA SC70	0
	AON6508 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 30V 29A/32A 8DFN	0
	AO3434 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 30V 3.5A SOT23-3L	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