The BAT15-099E6327 is an Infineon RF Schottky diode array with two independent junctions in a single SOT143-4 package, designed for mixer and detector circuits up to low-UHF frequencies. Each diode is rated for a maximum continuous current of 110 mA and a peak reverse voltage of 4 V, with a typical forward resistance of 5.5 Ω at 50 mA and 1 MHz — the low junction capacitance of 0.5 pF at 0 V bias keeps the RF signal path clean through the mixer core.
Housed in the PG-SOT143-4 package (TO-253-4 / TO-253AA equivalent), the four-pin footprint places the two Schottky junctions in a common-cathode or series configuration depending on the board layout — the datasheet pinout should be confirmed against the existing pad pattern before a re-spin.