>I read Elektor Nov '93 magazine, on page 5 there is a schematic for
>Electronic Load that use FET BUZ384. This FET is a so-called FREDFET,
>which is typified by a very fast integrated inverse diode that prevents
>the device being damaged by negative voltages across the drain-source
>junction. It hcan handle currents of up to 10.5 A and has a minimum
>drain-source transfer resistance, RDS(on), of 0.6 Ohm.

Most power MOSFETs today have these clamping diodes. So I'd check at the
web sites (or in the data books) of one of the suppliers you can get hold
of (like National or International Rectifier, from the DigiKey catalog) for
devices with your specifications. Probably you can use any power MOSFET
that fits your limits (obviously depending on the circuit). Check also for
Vdss (and switching times, if it is a switched app).

_If_ you really have problems getting a clamped MOSFET, just take any one
and clamp it with an appropriate (=fast) zener.