Dual common-cathode switching diode in a compact SOT-363
The BAV 70S E6433: The Infineon BAV 70S is a dual common-cathode switching diode pair in a PG-SOT363-PO surface-mount package. It handles an 80 V reverse voltage and 200 mA average rectified current per diode, with a forward voltage drop of 1.25 V at 150 mA.
The 4 ns reverse recovery time is the headline switching-speed spec. In a flyback snubber or a high-frequency rectifier stage, that fast recovery limits the stored charge that has to be swept out before the diode blocks reverse voltage. For a signal-level application — say, clamping an I2C bus line or protecting a comparator input — that 4 ns trr means the diode can catch fast transients without introducing a long tail of reverse current. Compare that to a standard-recovery signal diode where trr runs tens to hundreds of nanoseconds; this part keeps the switching node clean at higher frequencies.
Infineon lists the BAV 70S with an Active product status. The base product number is BAV 70, so if the reel suffix becomes unavailable, the bare BAV 70S die in the same package is the same device — just verify the packaging code with your distributor.
SOT-363 — what fits in the footprint
The package is a 6-VSSOP / SC-88 / SOT-363, specifically the Infineon PG-SOT363-PO variant. That is a 2.0 mm × 2.1 mm body with 0.65 mm lead pitch. No exposed pad, no thermal vias needed — standard reflow profile for a small-signal device. The common-cathode configuration means the two diode cathodes share pin 3 (typically), with anodes on pins 1 and 2, and the opposite-side pins repeat the pattern. Orientation is marked with a pin-1 dot on the top of the package. Can I swap it on site? Yes — it is a standard SOT-363 footprint, no special handling, and the marking is legible under a loupe.