Pre-biased PNP in a tiny SOT-883 package
The Infineon BCR 198L3 E6327 is a PNP pre-biased transistor with two integrated 47 kOhm resistors — one in the base leg (R1) and one between emitter and base (R2). That built-in bias network eliminates two external passives, shrinking the footprint for switching and driver stages where board space is tight. The transistor is rated for 50 V collector-emitter breakdown and 70 mA continuous collector current, with a transition frequency of 190 MHz that keeps it useful for moderate-speed switching up into the low-MHz range. Maximum power dissipation is 250 mW, which sets the thermal budget in a compact SOT-883 (PG-TSLP-3-4) package.
With R1 and R2 both at 47 kOhms, the base current is set by the input voltage and the resistor divider, so the transistor turns on at a predictable threshold without an external base resistor. This is useful in digital-output or microcontroller-driven loads where you want a clean on/off characteristic with minimal component count. Vce saturation is 300 mV maximum at 500 µA base drive and 10 mA collector current — a reasonable figure for a logic-level switch at moderate load. The minimum DC current gain (hFE) is 70 at 5 mA collector current and 5 V Vce, which gives enough headroom for most low-current relay, LED, or small solenoid drivers.