Built-in bias resistors simplify the BOM
The BCR 133L3 E6327: The BCR 133L3 is an NPN pre-biased transistor from Infineon that integrates two 10 kOhm resistors — one in series with the base (R1) and one from base to emitter (R2).
130 MHz transition frequency — fast enough for most switching
A 130 MHz transition frequency (fT) means this transistor can switch at several megahertz comfortably, covering PWM dimming, serial bus level shifting, and oscillator circuits. The 300 mV saturation voltage at 500 µA base drive and 10 mA collector current keeps conduction losses low in saturated switching.
Package choice: SOT-883 for tight layouts
Housed in the SC-101 / SOT-883 package (Infineon's PG-TSLP-3-4), this is a leadless, ultra-small 3-pin package suited for automated pick-and-place and reflow assembly. The 250 mW power dissipation limit means it is intended for low-power signal-level switching, not high-current drivers — keep the ambient temperature and PCB copper area in mind when derating.