What this pre-biased PNP transistor does on your board
The Infineon BCR 158L3 E6327 is a PNP pre-biased digital transistor in the tiny SC-101 (SOT-883) package. It integrates a 2.2 kΩ base resistor (R1) and a 47 kΩ emitter-base resistor (R2), so you can drive it directly from a logic output without adding external bias components. With a collector-emitter breakdown of 50 V and a continuous collector current rating of 100 mA, it handles low-side switching for relays, solenoids, indicator LEDs, and small-signal loads in 5 V to 24 V industrial and consumer circuits. The 200 MHz transition frequency also makes it usable for moderate-speed level translation or buffer stages.
Built-in resistor network — what it saves you
The 2.2 kΩ base resistor sets the base current when the input is pulled low, while the 47 kΩ emitter-base resistor ensures a clean off-state by shunting leakage. That means a single BCR 158L3 replaces a discrete PNP plus two resistors, shrinking the footprint and cutting placement cost. The saturation voltage is 300 mV max at 500 µA base drive and 10 mA collector current, which keeps dissipation low in lightly loaded outputs.
Package and production status
Housed in the SC-101 (SOT-883) surface-mount package, the BCR 158L3 E6327 is supplied in Tape & Reel for automated assembly.