Pre-biased NPN in a tiny leadless package
The Infineon BCR 116L3 E6327 is an NPN pre-biased transistor — the base resistor (R1) and base-emitter resistor (R2) are integrated on-chip at 4.7 kΩ and 47 kΩ respectively, saving one or two external passives per switching node. Collector current is rated to 100 mA, collector-emitter breakdown to 50 V, and transition frequency to 150 MHz, which covers general-purpose switching and driver roles in 3.3 V to 24 V industrial and consumer circuits. The part comes in a SC-101 / SOT-883 leadless package (Infineon's PG-TSLP-3-4), a 3-pin surface-mount footprint roughly 1.0 × 0.6 mm — small enough for dense PCB layouts where every square millimetre counts.
Resistor divider and saturation — what to expect
The 4.7 kΩ / 47 kΩ divider sets the base current for a given input voltage. With Vce saturation specified at 300 mV maximum at 500 µA base drive and 10 mA collector current, the part turns on hard enough for logic-level loads and relay or LED drivers. The 100 nA maximum collector cutoff (ICBO) means leakage is negligible at room temperature — no pull-down needed in most low-leakage designs.