> At this point, I think I might look at using a mosfet on the input of
> the whole device to limit current to something reasonable - dozens of
> amps for instance - probably a more reasonable solution.

You can get MOSFETs which have zero Vgth or very small and
"programmable" Vgth. They have charge injected into a floating gate to
trim them to whatever threshold is required on the externally
accessible gate. One of these driving a clamo or one of these driving
itself as a clamp MAY meet your need.

The Analog Devices ALD11... are examples

eg  http://aldinc.com/pdf/ALD110800.pdf
10 mV nominal Vgth

A glance through the spec sheet suggests it lacks brawn and has
significant Vds drop at low gate voltages at low Ids -  so use as a
trigger and not a clamp by itself, is indicated.



             Russell
--=20
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