SESK: Stuff Everyone Should Know · sesk.info/eng-mos-layers
In MOSFET, what do the letters M, O and S stand for?
Metal, oxide, semiconductor: the gate, its insulator, and the silicon.
- Magnetic, optical, silicon
- Metal, oxide, semiconductor ✔
- Main, output, source
Why: A metal gate sits on a thin oxide insulator above the silicon. Because the gate is insulated, a voltage on it controls the current with almost no gate current flowing.
Huh, didn't know that: Mohamed Atalla and Dawon Kahng at Bell Labs achieved the first insulated-gate transistor in 1959.
Why is the MOSFET so calm? Its gate is well insulated from drama.
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References
Answer: Metal, oxide, semiconductor. A metal gate sits on a thin oxide insulator above the silicon. Because the gate is insulated, a voltage on it controls the current with almost no gate current flowing.
- Computer History Museum, 1960: Metal Oxide Semiconductor (MOS) Transistor Demonstrated www.computerhistory.org/siliconengine/metal-oxide-semiconductor-mos-transistor-demonstrated
in a sandwich comprising layers of metal (M - gate), oxide (O - insulation), and silicon (S - semiconductor).
Checked 2026-10-10.
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