Pre-biased NPN in a tiny leadless package
The Infineon BCR 112L3 E6327 is an NPN pre-biased transistor in a PG-TSLP-3-4 package (SC-101 / SOT-883 footprint). It integrates two 4.7 kΩ resistors — one in series with the base, one between base and emitter — which means you drop two external passives from the BOM. That matters when you're squeezing a low-side switch or a signal-level driver into a dense board where every 0402 counts.
50 V, 100 mA — where it fits
Collector-emitter breakdown is rated at 50 V, and continuous collector current maxes at 100 mA. That puts this part squarely in the signal-switching and low-power driver class — think GPIO level translation, relay coil pre-drive, or turning on an LED string. The 140 MHz transition frequency keeps switching losses low for PWM up to a few megahertz. Saturation voltage is 300 mV at 10 mA collector current with 500 µA base drive, so the on-state drop is modest for a 5 V logic rail.
No last-time-buy notice, no end-of-life flag. For a repair bench or a production line, that means you can source it through normal distribution without worrying about a sudden discontinuation.