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[SOLVED] Is there such thing as a Normally Closed Mosfet or transistor like as?

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Iraianbu

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Is there such thing as a Normally Closed Mosfet or transistor like as?

Is there such thing as a normally closed mosfet? or can I somehow make a circuit ? can I control circuit one functions like as a control logic voltage 3.3v or 5v. when I give logic normally closed circuit change to normally open?
 

Solution
"depletion mode" is your search key. Many "RF" GaN, all GaAs and
silicon MESFET / JFET types are. You can find depletion mode Si
MOSFET discretes and dual-gate. I have worked in technologies
which had high, low, intrinsic and depletion VT on both N and PMOS.
Now that's a salad.
"depletion mode" is your search key. Many "RF" GaN, all GaAs and
silicon MESFET / JFET types are. You can find depletion mode Si
MOSFET discretes and dual-gate. I have worked in technologies
which had high, low, intrinsic and depletion VT on both N and PMOS.
Now that's a salad.
 

Solution
"depletion mode" is your search key. Many "RF" GaN, all GaAs and
silicon MESFET / JFET types are. You can find depletion mode Si
MOSFET discretes and dual-gate. I have worked in technologies
which had high, low, intrinsic and depletion VT on both N and PMOS.
Now that's a salad.
Depletion type MOSFET cost is high. I need Low cost and Simple Circuit like as this DMOSFET.
 

A P-MOSFET with the source connected to V+ and the drain as the output will be on when the gate is low (ground), giving a high-side switch.
Will that do what you want?
 

If you mean, as the original post, that the transistor itself
should conduct without imposing a different bias voltage to
it, then complex circuits don't fit that frame.

But maybe it's a frame problem.
 

Hi,

Depletion type MOSFET cost is high.

what are you design constraints e.g. current, voltage ratings, high-side or low-side application? You also can create the desired function with two transistors e.g. a N-MOSFET and P-MOSFET or even BJTs.

BR
 

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