Schottky rectifier in a low-profile SMA Flat Leads package
The STPS3L60UFN is a 3 A, 60 V Schottky diode from STMicroelectronics, housed in the DO-221AC SMA Flat Leads package — a low-profile surface-mount case suited for dense PCB layouts where height is constrained. It carries a forward voltage of 620 mV at the full 3 A rated current, which keeps conduction losses manageable in OR-ing, freewheeling, and output rectification stages.
STMicroelectronics lists the STPS3L60UFN as Obsolete. If your design can tolerate a footprint or package change, the base product number STPS3 family includes active variants in other packages (e.g., SMA, SMB) that may serve as a form-fit-function replacement after board layout review.
The 60 V reverse voltage (Vr max) covers 48 V bus rails with margin, and the 3 A average rectified current (Io) suits moderate-load rectification or OR-ing in redundant power architectures. The 620 mV forward drop at 3 A is a typical Schottky figure — expect roughly 1.9 W dissipation at full load, which the SMA Flat Leads package can handle with adequate copper on the PCB. The fast recovery characteristic (≤ 500 ns, > 200 mA Io) is inherent to the Schottky barrier; no reverse-recovery charge penalty, so switching losses stay low in 100–500 kHz converters.