Key ratings for a low-voltage Schottky
A 40 V reverse voltage rating (Vr max) and 1 A average rectified current (Io) place this in the standard low-voltage, moderate-current Schottky class – common in secondary-side rectification, freewheeling diodes, and polarity protection in 5 V and 3.3 V rails. The forward drop of 550 mV at 1 A is typical for a 40 V Schottky of this die size; it keeps conduction losses manageable in a 1 A continuous load. Reverse leakage is 12 µA at 40 V – a figure to note if the circuit idles at high temperature, since Schottky leakage rises with junction heat.
SMA Flat Leads – rework and layout notes
The SMA Flat Leads package (DO-221AC) is a low-profile, surface-mount body with flat leads that sit flush against the pad – no gull-wing standoff. That makes it a clean fit for boards where height is a constraint, but it also means the solder joint is less forgiving of pad-to-pad coplanarity variation. Under a hot-air station, the flat leads heat quickly because there is less lead mass to soak; the risk is lifting the pad if you dwell too long. Pin 1 orientation is marked by a notch on the body (SMAflat Notch) – find it before placing.