Most mosfets have normal Si PN junction 'inverse' diodes, unless they have
an integrated Shottky (I've never seen one of those, except for switching
power supplies where the Shottky Anode has a separate lead). This means
that they drop 0.6V, not 0.2V.

The L293 has bipolar switches and I do not think that they will conduct in
reverse.

Peter

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