PNP transistor for general-purpose switching and amplification
The Infineon BC807-16WE6327 is a PNP bipolar junction transistor in the standard SOT-23-3 surface-mount package (PG-SOT23-3-11). It is designed for general-purpose switching and linear amplification applications where a 45 V collector-emitter breakdown and 500 mA continuous collector current are sufficient. The 200 MHz transition frequency supports moderate-speed switching, and the minimum DC current gain of 100 at 100 mA, 1 V provides predictable base-drive requirements. The 150°C junction temperature rating allows operation in warm environments such as automotive engine compartments or industrial control cabinets.
The 45 V Vce breakdown sets the maximum supply rail this transistor can handle. For a 24 V industrial bus with transients, derating to 80% leaves 36 V headroom — comfortable. The 500 mA collector current covers solenoid drives, relay coils, and small-signal amplification. Saturation voltage is 700 mV at 50 mA base drive and 500 mA collector current, so power dissipation at 500 mA is roughly 350 mW — above the 250 mW package limit, meaning continuous operation at that current needs derating or pulsed duty.