Infineon lists the BAT 54-04 B5003 as obsolete. The last-time-buy period has passed, so new production lots are no longer available from the factory. Sourcing this part now means turning to the independent distribution channel, where verified date-code stock is quoted on request against an RFQ. Any lot offered should come with traceable date codes and a documented supply chain pedigree — mystery stock surfacing years after the official last-time-buy warrants extra scrutiny.
Series Schottky pair — what the 5 ns trr buys you
The BAT 54-04 B5003 integrates two Schottky diodes in a series configuration inside a single SOT-23-3 package. The 5 ns reverse recovery time is the headline switching spec: it lets this pair handle fast rectification in low-power DC-DC converters, flyback snubbers, and OR-ing diodes without the stored-charge penalty of a PN-junction part.
SOT-23-3 footprint and thermal limits
The series-connected die share the same junction temperature limit — thermal coupling means both diodes heat together under unbalanced current loads.