The BCR 148F E6327: The Infineon BCR 148F is an NPN pre-biased transistor in a SOT-723 surface-mount package. It integrates two 47 kOhm resistors — one in series with the base (R1) and one from base to emitter (R2) — so the designer can drop it into a switching or driver stage without adding external bias resistors. Collector-emitter breakdown is rated at 50 V, continuous collector current at 100 mA, and the transition frequency hits 100 MHz, making it suitable for low-power switching up to medium-speed digital loads like relay coils, small-signal level shifters, or LED drivers in space-constrained consumer and industrial PCBs.
The BCR 148F carries an obsolete lifecycle status. Any stock you find will be new-old-stock or pulled from overruns, so traceability and date-code freshness matter.
SOT-723 footprint — what the package means for rework and layout
The SOT-723 package (also designated PG-TSFP-3 by Infineon) is a three-lead, 1.2 mm × 1.2 mm body with a 0.4 mm lead pitch. It is one of the smallest discrete transistor packages available, which saves board area but demands careful stencil design and reflow profiling. For rework, a hot-air station with a fine nozzle is needed; the small body makes hand-soldering impractical. The 250 mW maximum power dissipation is a package-level limit — derate it for ambient temperature above 25 °C, and ensure the PCB copper area provides adequate heat sinking if the part runs near that ceiling.