That is qualitatively different than the above monolithic MOSFET Popularly used in board level switch mode power supplies has behavior The discrete vertical double diffused MOSFET transistor(VDMOS) The most relevant information is duplicated below: You can find more info in the LTspice Help page for MOSFETs. This builds upon a LEVEL=1 monolithic MOSFET, but changes a few things while keeping the simulation speed high. However, LTspice (due to its focus for simulating switch-mode power supplies) created its own proprietary structure called the VDMOS. Everything else in there are additional components around the MOSFET to assist in modeling it accurately. That is what you see in the 2N7000 subcircuit provided by OnSemi, where the. So, in order to accurately model those, manufacturers needed to create more complex subcircuits around a base monolithic MOSFET. The built-in SPICE MOSFET structures are for lateral monolithic (i.e. This is actually quite tricky, due to (1) how SPICE models in general are not typically created from datasheet parameters, and (2) how discrete power MOSFETs are modeled in the first place.
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