The Infineon BCR 148 B6327 is an NPN pre-biased transistor in a SOT-23-3 surface-mount package. It integrates two 47 kOhm resistors — one in series with the base (R1) and one between base and emitter (R2) — so you can use it as a simple switch or inverter without external bias components. Rated for 50 V collector-emitter breakdown and 100 mA continuous collector current, with a transition frequency of 100 MHz, it is suited for low-power switching, level shifting, and interface circuits in consumer, industrial, and automotive environments where board space is tight.
Built-in resistors save board space and BOM count
The 47 kOhm base resistor (R1) and 47 kOhm emitter-base resistor (R2) eliminate the need for two external passives per transistor. That matters when you are populating a dense PCB with multiple switching stages — fewer components, fewer placement errors, and a cleaner layout. The pre-biased configuration also guarantees a defined off-state with the base pulled low through R2, which simplifies the drive design.
Package and mounting
It comes in a standard SOT-23-3 package (also referred to as TO-236-3 or SC-59), with the supplier device package listed as PG-SOT23. That is a widely used footprint that pick-and-place machines handle without special tooling. The part ships in Tape & Reel, which is the expected format for volume assembly.