I'm using two STTH1R06A in series. The switchers usually operate between 50 an 100kHz so you want to keep the reverse recovery time below 50nS. 25nS or better at the low currents used is pretty easy to find. Just as important is the reverse voltage rating as these need to support the difference betwee the output voltage and the negative voltage during the primary on time which is worst at maximum input voltage.
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