If I want something to turn on or off I would use a MOSFET. Why would I ever want to use a transistor when I can use a MOSFET? Sorry, this is a really general question. I'm just trying to get the lay of the land.
Thanks.
Thanks.
It depends on a number of things.Why would I ever want to use a transistor when I can use a MOSFET? Sorry, this is a really general question.
For logic level interface, the 2n7000 is always a nice replacement.If I want something to turn on or off I would use a MOSFET. Why would I ever want to use a transistor when I can use a MOSFET? Sorry, this is a really general question. I'm just trying to get the lay of the land.
Thanks.
Yes.Throw?
All MOSFETs have two parasitic diodes. Unless you have a 4 terminal device (separate substrate connection) the one on the source is shorted in the case.Most MOSFETs, at least the ones I'm familiar with, have an intrinsic body diode, essentially an inverse parallel diode built into the device,
They only works if the reverse voltage is less than the reverse base-emitter breakdown voltage (typically about 5V).if you need that reverse blocking, it's easier to use A BJT than to jump through all the hoops to make the MOSFET work.
Cool! I had no idea there were two of them, so if course I had to Google it immediately and found the attached image. Thanks!All MOSFETs have two parasitic diodes. Unless you have a 4 terminal device (separate substrate connection) the one on the source is shorted in the case.
This image from RCA ICAN-6218 shows the parasitic diodes on a P and N channel MOSFET. They use a PWELL process, but it's similar for an NWELL process.
View attachment 199162
Ah, thanks for that clarification. I'm learning a lot today!They only works if the reverse voltage is less than the reverse-base emitter breakdown voltage (typically about 5V).
You have a parasitic diode whenever P and N material touch:Cool! I had no idea there were two of them
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