PNP general-purpose transistor with 45 V breakdown and 500 mA continuous current
The Infineon BC807-25B5003 is a PNP bipolar junction transistor in a SOT-23-3 surface-mount package, rated for 45 V collector-emitter breakdown and 500 mA continuous collector current. It delivers a minimum DC current gain of 160 at 100 mA collector current and 1 V Vce, making it suitable for medium-current switching and amplification in general-purpose circuits. The 200 MHz transition frequency supports moderate-speed switching applications such as relay drivers, small-signal amplification, and load switches in industrial and consumer electronics.
330 mW power dissipation in a SOT-23 package — thermal budget matters
The maximum power dissipation of 330 mW sets the thermal ceiling for this SOT-23 device. At 500 mA collector current, the Vce saturation voltage of 700 mV at 50 mA base drive (per the spec) generates 350 mW — already above the rating — so continuous operation at full current requires careful attention to duty cycle or heatsinking through the PCB copper. For linear-mode applications, derating from the 150°C junction temperature is essential; the part is rated for operation at junction temperatures up to 150°C, which suits environments like automotive under-hood or industrial enclosures where ambient temperatures can be high.
For volume commitments or date-code consistency, the SOT-23-3 package is widely used across Infineon's small-signal transistor portfolio, so alternate gain-group variants (BC807-16, BC807-25) share the same footprint and pinout, simplifying second-sourcing if needed.