Schottky pair — 20 A per diode at 520 mV forward drop
The RBR40NS30ATL: This is a 30 V Schottky rectifier in a common-cathode pair configuration, each diode rated for 20 A average rectified current. The 520 mV maximum forward voltage at 20 A keeps conduction losses low — important when the diodes share a heatsink tab in the TO-263AB package. Reverse leakage is specified at 600 µA at the 30 V maximum reverse voltage. The 150°C maximum junction temperature gives headroom for high-ambient or forced-air designs.
The large tab on the D²Pak provides a low thermal resistance path to the PCB copper — a solid thermal via pattern under the tab is expected for sustained 20 A per diode. The fast recovery speed (under 500 ns, above 200 mA) suits switching power supplies and DC-DC converter output rectification where reverse-recovery losses matter.