45 V, 500 mA PNP transistor in SOT-323
The Infineon BC 807-40W H6327 is a PNP general-purpose bipolar transistor in a small SOT-323 surface-mount package. It handles a collector current up to 500 mA and a collector-emitter breakdown voltage of 45 V, with a power dissipation of 250 mW. The 200 MHz transition frequency makes it suitable for switching and linear applications up to the low-MHz range. Typical uses include load switching, driver stages, and signal amplification in compact, low-power designs.
Key ratings for fit
The 45 V Vce breakdown sets the maximum rail voltage this transistor can block. The 500 mA collector current rating defines the load it can switch continuously. The 700 mV Vce saturation at 50 mA base current and 500 mA collector current gives a reasonable on-state voltage drop for a PNP device of this size.
The small footprint suits space-constrained boards. The 250 mW power limit means thermal management is by PCB copper area — no heatsink pad, so keep the ambient temperature in mind if running near the maximum current.