Active production — no BOM risk
The STPS340UF: ROHS3 compliance is confirmed, so the part clears EU and global regulatory requirements without a waiver or exemption check.
40 V, 3 A Schottky — low forward drop for DC rails
Rated 40 V reverse voltage and 3 A average rectified current, the STPS340UF is a Schottky barrier diode suited for low-voltage rectification, polarity protection, and freewheeling in DC-DC converters and power supplies. Forward voltage is 630 mV maximum at 3 A — lower than a standard PN-junction diode, which reduces conduction loss and improves efficiency in the output stage of a 3.3 V or 5 V rail. Reverse leakage is 20 µA at the rated 40 V — typical for a 3 A Schottky; the leakage rises with junction temperature, so thermal management at the PCB layout matters when the diode runs near its 150 °C junction limit.
SMBflat package — low profile, good thermal path
Housed in the DO-221AA (SMBflat) surface-mount package, the STPS340UF offers a low-profile footprint (typically 0.85 mm height) with a flat lead design that improves solder-joint reliability under thermal cycling. The package supports standard reflow soldering and is compatible with tape-and-reel handling for automated assembly lines.
Speed rating — fast recovery for moderate switching
Classified as Fast Recovery (≤ 500 ns, > 200 mA), the STPS340UF handles moderate-speed switching rectification — suitable for flyback diodes in relays, solenoids, and low-frequency DC-DC converters where the switching period is well above the recovery time.