Dual pre-biased pair in a SOT-363 footprint
The Infineon BCR48PNE6433BTMA1 integrates one NPN and one PNP pre-biased transistor in a single 6-pin PG-SOT363-PO package. Each transistor includes built-in bias resistors — 47 kΩ base (R1) on both sides, plus a 47 kΩ emitter-base resistor (R2) on the NPN — so you save board space and eliminate up to four external resistors per channel. This is a common building block for low-power switching, level shifting, and driver stages where the load current stays under 70 mA (NPN) or 100 mA (PNP) and the collector-emitter voltage never exceeds 50 V.
Obsolete — what that means for procurement
Infineon lists the BCR48PNE6433BTMA1 as obsolete. The only supply path is the surplus and independent distribution market — sealed factory reels, mixed date-code lots, or customer inventory resale. For a BOM line that depends on this exact order code, the procurement decision is straightforward: qualify a surplus lot against the original spec and order what the market holds, or plan a redesign around a current-production equivalent.
Key ratings — what they mean for fit
The 50 V collector-emitter breakdown sets the rail voltage ceiling. The 250 mW package dissipation limits continuous current; at 5 V rail and 70 mA on the NPN side, derating is necessary. The 300 mV saturation at 500 µA base / 10 mA collector is typical for a pre-biased part. The 100 MHz / 200 MHz transition frequencies are adequate for switching up to a few megahertz.