The STMicroelectronics STPS1150A is a 1 A, 150 V Schottky rectifier in the DO-214AC (SMA) surface-mount package. It is a single-diode design suited for low-voltage, high-frequency rectification, freewheeling, and polarity protection in switched-mode power supplies and DC-DC converter output stages. The key selection parameters are the 150 V reverse voltage rating and the 1 A average forward current, which define the blocking voltage and continuous load capability. The forward voltage drop is specified at 820 mV at 1 A — the conduction loss point for the rated current.
The cathode band is marked on the body; the anode is the opposite end. No exposed thermal pad — heat is dissipated through the solder joint and PCB copper.