Transistors - FETs, MOSFETs

Transistors - FETs, MOSFETs - Single

Image	Part Number	Description / PDF	Quantity	Rfq
	AOD4T60P Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 600V 4A TO252	0
	AO4492L Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 30V 14A 8SOIC	0
	AON6500_001 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 30V 71A/200A 8DFN	0
	AOL1454_001 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 40V 12A/50A ULTRASO8	0
	AO4435L_102 Alpha and Omega Semiconductor, Inc.	MOSFET P-CH 30V 10.5A 8SO	0
	AO4407 Alpha and Omega Semiconductor, Inc.	MOSFET P-CH 30V 12A 8SOIC	0
	AON7200 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 30V 15.8A/40A 8DFN	0
	AOL1448 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 30V 11A/36A ULTRASO8	0
	AO4435_201 Alpha and Omega Semiconductor, Inc.	MOSFET P-CH 30V 10.5A 8SOIC	0
	AO4292 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 100V 8A 8SOIC	0
	AON7474A Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 75V 4A/7.5A 8DFN	0
	AON6202 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 30V 21A/24A 8DFN	0
	AOTF11N62L Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 620V 11A TO220-3F	0
	AOTF20C60PL Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 600V 20A TO220-3F	0
	AOI516_002 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 30V 18A/46A TO251B	0
	AOI4C60 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 600V 4A TO251A	0
	AO4421L Alpha and Omega Semiconductor, Inc.	MOSFET P-CH 60V 6.2A 8SO	0
	AOD403L Alpha and Omega Semiconductor, Inc.	MOSFET P-CH 30V 15A/70A TO252	0
	AOD472 Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 25V 55A TO252	0
	AOD474B Alpha and Omega Semiconductor, Inc.	MOSFET N-CH 75V 2.5A/10A TO252	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