Source/Drain

09 FEOL Devices & Advanced Transistors

Notation S; D

Definition

The source and drain are the regions and associated terminals at the two ends of a field-effect transistor’s channel; under normal operation, the source supplies channel carriers and the drain collects them.

Application

Provide the gate-controlled current path in MOSFETs used for switching, including complementary n-channel and p-channel devices in CMOS logic.

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