Dual PNP transistor in SOT-363 — what it is and what it does
The Infineon BC856SE6327BTSA1 is a dual PNP general-purpose transistor in a 6-pin SOT-363 package. It pairs two matched PNP devices rated for 65 V collector-emitter breakdown and 100 mA continuous collector current, with a transition frequency of 250 MHz. The 250 mW power dissipation limit and the SOT-363 footprint make it a fit for compact switching and amplification stages on surface-mount boards.
Package and mounting
The 65 V Vceo gives you headroom for 24 V or 48 V rails without derating anxiety. The 100 mA Ic(max) is the per-transistor limit — if you parallel the two die, the package dissipation (250 mW) becomes the binding constraint, not the current sum. At 250 MHz ft, this transistor handles switching up into the low-MHz range cleanly; above that, you start seeing gain roll-off. The 650 mV Vce(sat) at 5 mA base, 100 mA collector is typical for a small-signal PNP — not a saturation switch for high-current loads, but fine for driving relay coils or LED strings within the current envelope.
This part carries an Obsolete lifecycle status. Infineon has ended production, and the only channel is surplus or broker stock. If you have a board that uses this exact order code, you are looking at last-time-buy inventory or a pin-compatible swap.