The STPS3L60SY is an STMicroelectronics automotive-grade Schottky rectifier from the Q series, rated for 60 V reverse voltage and 3 A average rectified current. Its forward voltage is specified at 700 mV maximum at 3 A, which is the figure to use for worst-case conduction loss calculations in your power supply or reverse-battery protection circuit.
60 V, 3 A — sizing the rectifier for the load
The 60 V reverse voltage rating provides a 1.5× to 2× derating margin against a nominal 12 V or 24 V automotive bus, including load-dump transients clamped to 40 V. The 3 A average current rating suits secondary-side rectification in DC-DC converters up to about 30 W output, or as a freewheeling diode in solenoid and relay drivers.
Package and footprint — SMC (DO-214AB)
Housed in the SMC (DO-214AB) surface-mount package, this part fits standard reflow assembly processes. The package footprint is shared with other SMC Schottky rectifiers, so a board designed for a 3 A SMC device can accept the STPS3L60SY without layout changes. The SMC body is larger than the SMA and SMB siblings, giving better thermal dissipation for the 3 A rating — useful when the diode sees continuous conduction at elevated ambient temperatures.