They sent me 6 out of the 10 that I ordered, so if those live through my testing (doubtful since they were the cheapest and smallest parts in the order), or I haven't made up my mind yet, Mouser has plenty of them.
Most modern mosfets are designed for switching applications. Attempting to operate them in the linear region requires SERIOUS derating. A 125 watt part may only be useful at 50 watts or less if biased such that it sees continuous voltage and current stress at the same time.
I am going to test some IXYS fets to see if the SOA ratings in the data sheets are real. It has been confirmed by myself and others that those in the ON Semi / Fairchild data sheets are pure BS. Ditto a lot of the fets in my collection, some of which are 20+ years old.
IXYS has parts clearly intended for linear operation. They are not cheap. They also have some depletion mode fets with decent SOA ratings published in the data sheet, but no mention of linear operation is among the suggested uses. There is one sure way to find out if they meet my needs, and it requires a blast shield over the part. I used to use an inverted coffee mug, but maybe I'll find something transparent for video purposes.
Most modern mosfets are designed for switching applications. Attempting to operate them in the linear region requires SERIOUS derating. A 125 watt part may only be useful at 50 watts or less if biased such that it sees continuous voltage and current stress at the same time.
I am going to test some IXYS fets to see if the SOA ratings in the data sheets are real. It has been confirmed by myself and others that those in the ON Semi / Fairchild data sheets are pure BS. Ditto a lot of the fets in my collection, some of which are 20+ years old.
IXYS has parts clearly intended for linear operation. They are not cheap. They also have some depletion mode fets with decent SOA ratings published in the data sheet, but no mention of linear operation is among the suggested uses. There is one sure way to find out if they meet my needs, and it requires a blast shield over the part. I used to use an inverted coffee mug, but maybe I'll find something transparent for video purposes.