The STPS140U: ROHS3 compliant, so no lead-free transition risk for ongoing builds.
40 V reverse, 1 A forward — the rail it fits
Rated for 40 V DC reverse (max) and 1 A average rectified current. This is the sweet spot for low-voltage secondary-side rectification in 12 V or 24 V DC-DC converters, OR-ing diodes on power-rail inputs, and freewheeling clamp diodes in low-power inductive loads. Forward voltage is 550 mV max at 1 A — typical Schottky conduction loss for this current class, meaning the junction stays within the 150 °C max rating in a well-ventilated SMB pad layout.
Fast recovery <500 ns — why it matters for switching
That recovery speed keeps switching losses low in flyback or forward converters running at moderate frequencies — think 50–100 kHz SMPS stages where a standard pn-junction rectifier would ring or overheat.
DO-214AA SMB — footprint and sourcing check
Supplied in the DO-214AA (SMB) surface-mount package. The SMB footprint is a standard across many Schottky and ultrafast diodes — if your BOM already uses an SMB diode, this part drops in without a layout change.