semiconductors is a dependable overview of different Semiconductors

Manufacturers and distributors of Integrated Circuits begin with F

Fairchild Semiconductor: Fast, FACT and LCX in logic, EPROM's and EEPROM's such as HiSeC and Plug & Play memory and SMT Power DMOS such as SuperSOT -3/-6/-8, PowerSOT and SO-8 in discrete.
Aqcuisition by Onsemi.
Fast Analog Solutions: Since about late 2001 or early 2002 part of Zetex.
FirstPass
Flextronics: Provides ASIC products, including full System on Chip (SoC), Standard Cell, and Gate Array ASIC (digital, analog and mixed signal).
FOCAM Technologies Inc.: Microelectronics company specializing in analog, mixed-signal and digital integrated circuit design, analog and digital IP modules design and characterization and chip supply.
FOCUS Enhancements, Inc.: Manufacture superior video conversion technology including scan converters, scalers, and video encoders.
Future Technology Devices International, Ltd.: Main product line is USB peripheral and hub controller I.C.'s also custom I.C. design services.
Fuji Semiconductor: Power Devices (and many more)

Galileo Technology: Switched Ethernet Controllers, PCI System Controller, Remote Access Controllers
GHz Circuit Design Inc.: RF and Mixed signal design. Experience in Bipolar, CMOS, BiCMOS, and GaAs.
General Software, Inc.: Make BIOS's
Gennum Corporation
GHz Circuit Design, Inc: RF and Mixed Signal IC Design, RF and Mixed Signal IP Cores
GHz Technology, Inc.: Supplier of Silicon RF and Microwave Power Transistors for use in Applications Specific Products.
General Instrument: Power rectifiers and transient protection devices General Instrument Corporation is the world leader in analog and digital systems that provide video, audio and high-speed Internet/data services over cable and satellite TV networks.
Genesis Microchip Inc.
Green Power Semiconductors Spa: Manufacturer of power semiconductor devices (SCR's, diodes, IGBT's, FET's), high power assemblies (AC-switches, bridges), assembly components (bar and box clamps, flex bus bars), SCR and IGBT drivers. Test lab (thermo-electrical characterization of power devices and systems, short and long term reliability tests, EMI tests).
GSI Technology: GSI Technology designs, develops and markets a broad range of high performance memory products for networking, military, medical, automotive and other applications.