The STMicroelectronics STPS30SM100SR is a 100 V, 30 A Schottky rectifier diode in a TO-262-3 (I2PAK) through-hole package. The 870 mV forward drop at 30 A keeps conduction losses manageable for a 30 A device, and the 45 µA reverse leakage at 100 V is typical for a Schottky of this voltage and current class.
STMicroelectronics no longer manufactures this part in its original form. For a BOM line that specifies this exact order code, procurement must go through surplus, broker, or independent distribution channels.
The 100 V reverse voltage rating gives headroom for 48 V and 72 V bus rails with typical derating for transients. The 870 mV forward drop at 30 A means about 26 W conduction loss at full load, which drives the heatsink sizing. The 45 µA leakage at 100 V doubles roughly every 10 °C above 25 °C junction, so at 125 °C junction the leakage can approach several milliamps — factor that into standby power budgets for hot environments. The Fast Recovery =< 500 ns classification is typical for a Schottky; the lack of stored charge means it switches faster than a PN diode, which matters for the switching losses in a 50–100 kHz converter.