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.
This part carries an obsolete lifecycle status, meaning Infineon has discontinued production.
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. With a minimum DC current gain of 250 at 100 mA collector current and 1 V Vce, base drive requirements are modest — a few milliamps from a microcontroller GPIO or driver stage will saturate it for most loads. 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.
Package and footprint
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.