Automotive-grade Schottky for 150 V, 1 A rectification
The STPS1150AY is an automotive-grade Schottky rectifier from STMicroelectronics' Q-Series, rated for 150 V reverse voltage and 1 A average forward current. It is housed in a DO-214AC (SMA) surface-mount package and qualified for use in automotive environments — the AEC-Q grade is the primary differentiator from the standard STPS1150.
The 150 V blocking voltage gives headroom for 48 V board nets and 12 V systems with load-dump transients. The 1 A average rating covers typical low-power rectification, freewheeling, and polarity protection roles. Forward voltage is 820 mV maximum at 1 A — this sets the conduction loss at 0.82 W, which the SMA package can dissipate with adequate copper area on the PCB. Reverse leakage is specified at 1 µA at 150 V, a low figure that suits battery-backed circuits and high-impedance sense lines. The junction temperature rating of 175°C maximum allows the part to operate in under-hood or other high-ambient locations without derating the current prematurely.