Common-cathode Schottky pair — what the 30 V / 200 mA rating buys you
The Infineon BAT54-05E6327 is a 1 Pair Common Cathode Schottky diode in a three-pin SOT-23-3 package (PG-SOT23-3-3). The common-cathode topology lets you OR two power rails or clamp two signal lines to a single reference with one package, saving board area over two discrete diodes. The 30 V reverse voltage rating covers 3.3 V, 5 V, and 12 V rails with margin; the 200 mA average rectified current per diode handles low-current OR-ing, protection clamping, and small-signal rectification. The 5 ns reverse recovery time keeps switching losses low in DC-DC converters and high-speed logic protection.
Forward drop and leakage — the trade-off at 100 mA
Maximum forward voltage is 800 mV at 100 mA forward current — a typical Schottky knee for this current class. Reverse leakage is 2 µA at 25 V reverse bias, which is low enough for battery-powered circuits where quiescent draw matters.
For production BOMs that already use this part, the supply channel is stable through standard distribution. For new designs, the BAT54-05 family offers the same die in single, dual-series, and dual-common-anode configurations if the common-cathode pinout does not fit.