What is the gate voltage required to turn this transistor on?
Depends on what you mean by logic level. These days, logic level devices are considered with 3.3V logic in mind and threshold voltage would be around 1.5V max and 2N7000 wouldn't qualify.I do not believe this is a logic level mosfet device.
It's not quite a true logic-level device as it has a maximum Vgs(th) of 3V and requires Vgs=10V to get the minimum on-resistance value, but it will conduct 75mA with a low drop at a Vgs of 4.5V.I do not believe this is a logic level mosfet device.
If there is I haven't heard of it or had occasion to use one. When it comes to MOS structures, the notion of complementary is not equivalent to the same concept for Bipolar Junction Transistors. Feature size and die area would be different for a truly complementary device. P-channel devices are less numerous and less diverse than their N-channel cousins. On integrated circuits P-channel devices show up rarely. Why do you ask?So is there a complementary device?
There were discrete BJT's before there were integrated circuits. With enhancement mode MOS devices, the discrete parts and the ICs were developed at roughly the same time. Discrete PMOS transistors failed to find a niche in that environment. That's my recollection and my hypothesis. As always, I could be wrong.That's also true for bipolar devices.
There are so many good options for properly driving a MOSFET that it seems sub-optimal to go looking for specialty parts that may be in short supply.2N7000 is a very old DMOS mosfet, among the first in a TO-92 package. Came out around 1982 same as Siliconix VN10K. I use the 2N7000K which has the essential gate protection zener, because these parts are super susceptable to ESD.
I dislike the name "Fetlington" one guy used for it, that's something totally different - a compound Darlington using a JFET. There's no "ling" in a mosfet lol.
Look at BSS138 and BSS84 (P-ch) I think they are better in the world of 3-5V gate drive and SOT-23.
For 3.3V drive small power mosfets there's not many out there.
You use a bootstrap circuit to produce an adequate gate voltage to turn on a garden variety FET and achieve a low Rds(on).The 2N7000 is older (30 years) through-hole TO-92 and people have moved on to SOT-23. MOSFET technology did greatly improve since then - lower VGS (on) and RDS (on).
What do you do if your MCU is 5V or 3.3V ?
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