PNP pre-biased transistor — what the ratings mean
The built-in 22 kΩ base resistor (R1) eliminates the external resistor needed in a standard transistor switch, saving board space and reducing BOM count for low-side switching of loads up to 100 mA collector current at 50 V collector-emitter breakdown. The 250 mW power dissipation limit and the SOT-723 footprint mean the part is sized for low-power, space-constrained designs; thermal management is straightforward in ambient environments below 85 °C.
Infineon lists the BCR 189F as Obsolete. A buyer should confirm the date-code range and verify that the parts have not been exposed to moisture beyond the MSL floor life.
