Pre-biased PNP — the BOM simplification it was designed for
The BCR 183 B6327 is a PNP pre-biased digital transistor from Infineon, integrating a 10 kOhm base resistor (R1) and a 10 kOhm emitter-base resistor (R2) in a single SOT-23-3 package. It replaces the discrete transistor plus two external resistors, saving board space and reducing component count in switching and interface circuits. With a collector-emitter breakdown of 50 V and a continuous collector current rating of 100 mA, it suits low-side load switching, logic-level translation, and driver stages in industrial and consumer electronics where the input comes directly from a microcontroller or sensor output.
The 200 mW maximum power dissipation sets a practical ceiling on continuous collector current at a given Vce. At 300 mV saturation (typical at 10 mA), the dissipation is only 3 mW, leaving ample headroom. But driving the full 100 mA at a Vce of 2 V would hit 200 mW — so the load voltage drop and duty cycle need checking if you are switching near the current limit. For most logic-level switching at 5 V or 3.3 V with a saturated transistor, the margin is comfortable.
Obsolete — filling the BOM line now
Infineon has marked the BCR 183 B6327 as obsolete. It is no longer in production, so new designs should avoid it. There is no official Infineon successor listed for this exact order code; a pin-compatible pre-biased PNP in SOT-23 with 10 kOhm resistors from another manufacturer may serve as a drop-in, but verify the resistor ratio and Vce(sat) against your operating point before committing the board.