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Definition: FinFET
(FIN Field Effect Transistor) A 3D transistor architecture that uses one or more raised channels ("fins") from source to drain. FinFETs are the predominant transistor architecture that replaced CMOS for technology nodes smaller than 20 nm. For example, Intel's Tri-Gate is a type of FinFET transistor (see Tri-Gate transistor and SuperFIN). See CMOS, FET and MOSFET.
Source/Drain Regions Form Fins
Emerging in the 2010s, FinFETs enable faster switching times and have a higher current density than regular CMOS transistors. The multiple thin fins reduce current leakage between source and drain. (Image courtesy of Intel.)