12/24/2023 0 Comments Transistor diagram exampleThe construction of the Metal Oxide Semiconductor FET is very different to that of the Junction FET. The direction of the arrow pointing to this channel line indicates whether the conductive channel is a P-type or an N-type semiconductor device. If the channel line is shown as a dotted or broken line, then it represents an “Enhancement” (normally-OFF) type MOSFET as zero drain current flows with zero gate potential. If this channel line is a solid unbroken line then it represents a “Depletion” (normally-ON) type MOSFET as drain current can flow with zero gate biasing potential. The line in the MOSFET symbol between the drain (D) and source (S) connections represents the transistors semiconductive channel. When this is the case, as in enhancement types it is omitted from the symbol for clarification. Usually in discrete type MOSFETs, this substrate lead is connected internally to the source terminal. It connects to the main semiconductive channel through a diode junction to the body or metal tab of the MOSFET. The four MOSFET symbols above show an additional terminal called the Substrate and is not normally used as either an input or an output connection but instead it is used for grounding the substrate. The symbols and basic construction for both configurations of MOSFETs are shown below. The enhancement mode MOSFET is equivalent to a “Normally Open” switch.
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