The STPS2L25AFN is a 25 V, 2 A Schottky rectifier from STMicroelectronics, part of the STPS2 family. It is designed for low-voltage, high-frequency rectification where forward drop dominates conduction loss. Maximum reverse voltage is 25 V. The 450 mV forward drop at 2 A (typical at 25°C) keeps junction temperature under control in continuous 2 A duty. Reverse leakage is 90 µA at 25 V, 25°C — expect it to rise sharply at higher junction temperatures, so thermal management matters in high-ambient or constrained airflow designs.
STMicroelectronics lists the STPS2L25AFN as Obsolete. The base product number STPS2 family includes active variants, but this specific SMA Flat Leads package and 25 V / 2 A rating is discontinued.
Package and footprint — SMA Flat Leads
The SMA Flat Leads package is a low-profile surface-mount outline with a notch for orientation. It is smaller than standard SMA — the flat leads reduce the overall height, which helps in tight enclosures but also limits the copper area under the cathode for heat sinking. The supplier device package is SMAflat Notch. Board layout should follow the recommended footprint in the datasheet for the SMA Flat Leads case, with adequate thermal vias under the cathode pad if the design runs at the full 2 A continuous.