PNP pre-biased transistor with integrated bias resistors
The Infineon BCR158E6327 is a PNP pre-biased transistor in a SOT-23-3 surface-mount package, qualified to AEC-Q101 for automotive applications. It integrates a 2.2 kOhm base resistor (R1) and a 47 kOhm emitter-base resistor (R2), eliminating two external passives from the BOM. Collector-emitter breakdown is rated at 50 V, with a continuous collector current of 100 mA and power dissipation of 200 mW. Transition frequency is 200 MHz.
The AEC-Q101 certification means this part has passed the automotive stress tests: temperature cycling, high-temperature reverse bias, and humidity bias. It is rated for the under-hood and chassis-domain temperature profiles typical of automotive electronics.
50 V Vce and 100 mA Ic — application fit
With a 50 V collector-emitter breakdown and 100 mA continuous collector current, this transistor suits 12 V and 24 V automotive loads: relay drivers, solenoid drivers, indicator LEDs, and logic-level interface circuits. The pre-biased resistors set a fixed base current, so the transistor saturates with a known drive — useful for switching loads where you want a predictable Vce(sat) of 300 mV at 10 mA collector current with 500 µA base drive.