The STMicroelectronics STTH6102TV1 is a fast-recovery dual-diode module in an ISOTOP package, chassis-mount, containing two independent standard diodes each rated for 30 A average rectified current at a 200 V reverse voltage. The 30 ns reverse recovery time (trr) places it in the fast-recovery class for hard-switched rectifier and freewheeling applications up to several hundred kHz.
30 ns trr and 1.05 V forward drop — the switching trade-off
The 30 ns trr is the headline switching spec — it tells you the diode can clear stored charge fast enough for a 50–100 kHz hard-switched bridge without excessive turn-off loss. The forward voltage is 1.05 V max at 30 A per diode, which is a reasonable conduction loss for a 200 V fast-recovery part; expect about 31.5 W per diode at full rated current, so the ISOTOP baseplate needs a heatsink sized for that thermal load.
The STTH6102TV1 is listed as obsolete. If you need a production-run alternative, look at the STTH6002 series or a comparable fast-recovery dual-diode in ISOTOP from a second source; the pinout and footprint are standard for this package style.