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I think I did that test of the turn-off spike, but now I don't remember the results. I could do it again. I know the "theoretical" turnoff spike is supposed to be:
V_turnoff_spike = L * di/dt. And the sbe ring cap is supposed to have about 5nH of stray inductance "in a suitable laminar bus structure" haha. So, if you are turning off in 1uS:
V_turnoff_spike = 5*10^-9 * 1000Amp/10^-6
= 5 volts, assuming 1000amp.
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