Replacement FET (200 Vds, 30A)

I'd shoot for the lowest Qg at 5V.

Cheers

Thanks Martin, I ordered Fairchild, as well as the NXP above. I figure both will work, And I'll have two replacements. I didn't design the circuit. So I only know it sorta. The important part is when it shut's off the polarizing current in an Earth's Field NMR apparatus. A big air coil made with litz wire, R~10 ohms maybe 1000 turns, I'd have to look up the inductance. maximum current 3A for ~20 seconds. There's damping network, Zener, diode and resistors. That soaks up most of the back emf. And (I think)* that as long as it turns off in less than ~1/4 cycle of the resonant frequency (~3kHz) then the spins don't have enough time to "follow the field" as it decays, and they remain polarized.

George H.