15 A per diode — where the current rating lands
The FERD30M45CG-TR is a dual common-cathode rectifier array from STMicroelectronics, built on their proprietary FERD (Field Effect Rectifier Diode) technology. Each of the two diodes is rated for 15 A average rectified current at a 45 V reverse voltage, with a forward voltage of 470 mV typical at that current. The common-cathode configuration makes it a direct fit for centre-tap secondary rectification in a push-pull or half-bridge converter, or as a pair of OR-ing diodes in a redundant power rail.
No Recovery Time — what the speed rating actually means
The 'No Recovery Time > 500 mA (Io)' spec means the diode exhibits negligible reverse recovery charge when switching from a forward current of 500 mA or less. In practice, this makes the part suited for the output stage of a switching power supply operating at 100 kHz or above, where a conventional ultrafast rectifier would still generate recovery losses. The FERD structure achieves this by limiting the minority carrier storage, giving a softer turn-off characteristic than a standard Schottky of the same voltage class.
D²PAK package — thermal and footprint reality
The D²PAK (TO-263AB) package is a surface-mount power package with a large exposed copper tab on the bottom. The tab is the cathode common terminal for both diodes, so the PCB copper area under the tab directly sets the junction-to-ambient thermal resistance. For a 30 A total output (15 A per die), the board needs a minimum of 6 cm² of 2-oz copper on the tab pad to keep the junction below 125 °C in still air. The package is rated for a maximum junction temperature of 175 °C, which provides headroom for surge conditions.
No official second source or pin-compatible replacement is listed by ST, but the common-cathode D²PAK footprint is a standard pinout shared by many dual Schottky and FERD rectifiers in the 30 A class.