PNP switching transistor in SOT-23
The Infineon BC 807-25 B5003 is a general-purpose PNP bipolar transistor rated for 45 V collector-emitter breakdown and 500 mA continuous collector current, in a surface-mount SOT-23-3 package (PG-SOT23). With a 200 MHz transition frequency and a saturation voltage of 700 mV at 50 mA base drive and 500 mA collector current, it suits medium-speed switching and linear amplification in low-power circuits.
Buyers should confirm date-code freshness and verify against the original Infineon datasheet for the BC 807-25 grade (hFE range 160–400 at 100 mA).
Key ratings for the design
The 45 V Vce breakdown and 500 mA Ic rating place this transistor in the medium-voltage, medium-current class — suitable for relay drivers, LED switching, and general-purpose signal amplification below 500 mA. The 700 mV Vce(sat) at full rated current is typical for a PNP of this size, but the designer should budget the saturation drop when calculating load voltage at low supply rails. Maximum power dissipation is 330 mW, which in the SOT-23 package limits continuous current to roughly 200–300 mA at 25 °C ambient depending on derating.