Let’s start with the shorthand notation of the NMOS and the PMOS FETs in enhancement mode. In particular, some of the parts of the symbol represent the physical layout of that particular type of FET. The next image shows the N channel MOSFET transistor physical structure with its four terminals: Gate, Drain, Source and Substrate. MOSFET transistors (NMOS) physical structure. If you’re not comfortable with these terms, then this tutorial is not going to make much sense. The following image shows the different symbols used to describe the MOS transistor. It’s so important, we actually created a tutorial talking about it and recommend you go check it out if you’re not confident. However, we will review the IEEE standard symbols and that should help in the vast majority of situations.īefore we jump into it, it’s important to understand the difference between NMOS and PMOS FETs as well as the difference between depletion and enhancement mode FETs. There are also different requirements when dealing with discrete MOSFETs or MOSFETs in an integrated circuit. While we feel this will be very helpful, there are enough personal and company variations that we can’t guarantee that there will still occasionally be confusion. In this tutorial, we will help you know the difference between the different MOSFET symbols that you come across. There are well over a dozen different MOSFET schematic symbols in circulation and, between the different symbols that represent the same thing and the many different types of MOSFETs to be represented, this can become incredibly confusing.
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