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P-Channel Depletion MOSFET right right choice?

Kevin Kachikian1
Prodigy 150 points
Other Parts Discussed in Thread: CSD13380F3

Hi. I have an application where I think I need a P-Channel Depletion mode MOSFET to switch a low current and low voltage. Basically the configuration is: with no Gate voltage (either floating or 0v), I need to switch +2.5v - +5.1v through to the Drain from the Source. The Drain will be attached to ground through a 2K resistor and then to a high impedance input pin. The Source will be attached to a voltage that can be from ~ +2.5v to +5.1v. The gate voltage will be digital: either 1.8v and 0v -or- it will be 3.3v and 0v. Does TI make anything that will work for this application? Is a P-Channel Depletion mode the right kind for this application where I need it to normally be conducting even when the Gate is open? Thank You.

  • 0
    TI__Mastermind 38450 points

    Hi Kevin,

    Thanks for your interest in TI FETs. TI does not make any depletion mode (normally on) MOSFETs, either P-channel or N-channel. All of our FETs are enhancement mode (normally off) and a gate-source voltage (negative for P or positive for N) must be applied to turn the device on. Can you use an N-channel enhancement mode device with the source grounded and drain connected to the voltage source? We have some N-channel FETs with rds(on) specified at VGS = 1.8V such as CSD13380F3. Other than that, you can take a look at TI's load switch products. I have provided a link below.