Dual series switching diode in PG-SC74-6
The Infineon BAV99UE6327HTSA1 is a standard switching diode configured as two pairs in series, housed in a PG-SC74-6 surface-mount package.
NRND — plan the last-time buy
For existing BOM lines that already specify this diode, the NRND flag means you should evaluate the last-time-buy window and qualify a production alternative before the supply closes.
4 ns reverse recovery — what it buys you
The 4 ns trr is the headline switching-speed spec. It allows the diode to turn off quickly after forward conduction, which is critical in high-frequency rectification, snubber clamps, and flyback catch diodes where stored charge would otherwise cause ringing or overshoot. At 200 mA forward current the forward voltage drop is 1.25 V max — typical for a small-signal switching diode in this voltage class.
The PG-SC74-6 package (SC-74, SOT-457 footprint) is a 6-lead SMD case. The two diode pairs are internally series-connected, so the pinout differs from a standard quad diode array — verify the connection diagram against your PCB layout before committing the board. The Tape & Reel shipping medium is standard for volume pick-and-place.