A depletion-mode MOSFET requires an opposite polarity voltage to turn off, thus they are difficult to use with single supply circuits.Does any one know why they don't make power depletion MOSFETs?
It could be useful as a source follower in a linear regulator or audio amplifier.A depletion-mode MOSFET requires an opposite polarity voltage to turn off, thus they are difficult to use with single supply circuits.
How many JugFETs have you seen that are rated to ≥10A?As far as I know all JFETS are inherently depletion mode, so that's the only kind of JFET you can buy.
I don't understand the problem of having a maximum Vds of 500V. They are spec'd to less than 5V Vds and the packages (e.g., TO-252 and TO-268) are common for mosfets rated at 20A. The other producer I found, Supertex, may have smaller packages, as it does not offer products with quite the current capability of the IXYS devices. Perhaps, the high voltage rating is simply a function of the way they are manufactured.So far the only depletion power MOSFETs I've seen are those linked by jpanhalt which are high voltage devices. I wonder why one would want a high voltage normally on switch?