The Infineon BC 807-40W E6433 is a general-purpose PNP bipolar transistor in a surface-mount SOT-323 (SC-70) package. It is rated for a collector-emitter breakdown voltage of 45 V and a continuous collector current of 500 mA, with a power dissipation of 250 mW. The -40 gain group guarantees a minimum DC current gain of 250 at 100 mA collector current and 1 V Vce, making it suitable for medium-current switching and linear amplification in low-power circuits. Typical applications include load switching, driver stages for relays or LEDs, and signal amplification in consumer, industrial, and automotive auxiliary electronics where space on the board is tight.
Obsolete — sourcing through independent distribution
The BC 807-40W carries an obsolete lifecycle status. Infineon no longer manufactures this specific order code in volume, so the only available channel is the surplus and aftermarket market.
The 45 V Vce breakdown and 500 mA collector current give this transistor enough headroom for 12 V and 24 V rail switching with a reasonable safety margin. The 250 mW power limit in the SOT-323 package means the junction temperature climbs quickly above 100 mA continuous — check the derating curve if the device is driving a load near 200 mW at elevated ambient. The 200 MHz transition frequency is adequate for audio-frequency amplifiers and low-speed switching up to a few megahertz; it is not a high-speed RF part. The 100 nA ICBO cutoff current is typical for a small-signal PNP and will not cause leakage issues in most low-power designs, but it matters in high-impedance bias networks where nanoamp-level leakage can shift operating points.