Pre-biased PNP in SOT-723 — what the integrated resistors buy you
The BCR 191F E6327: The BCR 191F is a PNP pre-biased transistor from Infineon, integrating two 22 kOhm resistors — one in series with the base (R1) and one between base and emitter (R2) — so the designer needs no external bias network for simple switching or driver stages. Housed in a 3-pin SOT-723 (PG-TSFP-3) surface-mount package, it dissipates up to 250 mW and switches at a transition frequency of 200 MHz.
Obsolete — sourcing through the surplus channel
Infineon lists the BCR 191F as Obsolete, meaning the factory has ended production and no last-time-buy window remains open.
50 V, 100 mA — the switching envelope
Rated for 50 V collector-emitter breakdown and 100 mA continuous collector current, this part suits low-side switching, relay drivers, or logic-level translation in circuits where the external bias resistors are undesirable. Saturation voltage is 300 mV at 500 µA base current with 10 mA collector load — the integrated resistors set the base drive, so the on-state voltage drop is fixed by the resistor ratio and the input voltage.