What the 30 A, 60 V rating means for your power stage
The STPS30M60D is a 60 V, 30 A Schottky rectifier in a TO-220AC through-hole package. Its forward voltage drop is 605 mV max at 20 A. The 60 V reverse voltage rating provides margin for 48 V bus rails and transient spikes common in industrial power supplies, though the 165 µA reverse leakage at 60 V should be factored into the standby power budget at elevated junction temperatures.
STMicroelectronics lists the STPS30M60D as obsolete. For a legacy BOM line that requires this exact part, sourcing runs through independent distribution and surplus inventory channels. Each lot should be date-code traced and visually inspected — the TO-220AC package is a common target for re-marked devices, and the laser etch on the body is a forensic check point against known ST font standards. The TO-220AC footprint is widely used, so pin-compatible alternatives exist across multiple suppliers.
Package and thermal — the TO-220AC reality
The STPS30M60D comes in a TO-220AC (TO-220-2) through-hole package. The metal tab is the cathode and must be heatsinked for any continuous current above a few amperes — the 30 A rating assumes adequate heatsinking and forced airflow or a large copper plane. The junction temperature limit of 150°C drives the thermal design: at 20 A the forward drop is 605 mV, producing roughly 12 W of conduction loss that must be dissipated. For automated assembly, verify feeder compatibility — tube-to-tape conversion may be needed for pick-and-place lines that expect tape-and-reel input.