The STPS30L30DJF-TR is a 30 V, 30 A Schottky rectifier from STMicroelectronics in the PowerFlat 5x6 mm package. The 30 A average rectified current and 510 mV forward drop at that current indicate low-loss rectification in high-current power paths. The 30 V reverse rating sets the ceiling for the DC bus or output rail it can protect. The 750 µA reverse leakage at 30 V is a room-temperature figure — expect it to climb significantly as the junction approaches the 150°C maximum.
The pad is roughly 5 mm by 6 mm — that's a lot of thermal mass under the hot-air nozzle. A standard reflow profile works, but hand-rework with hot air needs a preheat plate underneath the board to avoid lifting the pad. The tape-and-reel (TR) suffix means it ships on reels.
ROHS3 compliant per.