40 V, 1 A Schottky for automotive and industrial rectification
The STPS1L40UY is a 40 V, 1 A Schottky rectifier from STMicroelectronics' Q Automotive series, housed in a surface-mount SMB (DO-214AA) package. Its low forward voltage drop of 500 mV at full rated current reduces conduction losses in power-supply output rectification, freewheeling diode, and polarity-protection stages.
Switching speed and thermal envelope
Rated as a fast-recovery diode with a recovery time under 500 ns at forward currents above 200 mA, the STPS1L40UY handles switching frequencies well beyond line-frequency rectification — suitable for DC-DC converter output stages and secondary-side synchronous rectification where Schottky's majority-carrier switching eliminates stored-charge recovery losses. The junction temperature range spans -40°C to +150°C, covering the automotive under-hood ambient and industrial enclosure hot spots. Reverse leakage is specified at 35 µA at the 40 V reverse maximum — a figure that rises with temperature, so the designer should budget derating for high-ambient, continuous-reverse-bias applications.
Board-fit and procurement note
The SMB (DO-214AA) footprint is a common surface-mount package for medium-current Schottkys — the same pad layout serves many 1 A to 2 A rectifiers, simplifying BOM second-sourcing. The STPS1L40UY is available in Tape & Reel (TR) and Cut Tape (CT) options for both production reels and prototype quantities.