PNP switching transistor — 45 V, 500 mA in a SOT-23-3
The Infineon BC80740E6327 is a PNP epitaxial planar transistor in the BC807 series, housed in a PG-SOT23-3-11 package. It is a general-purpose switching and amplification device rated for 45 V collector-emitter breakdown and 500 mA continuous collector current. The 330 mW power dissipation limit and 150°C junction temperature rating suit it for moderate-load applications in industrial control, power management, and signal conditioning circuits where a small surface-mount PNP is needed.
What the 250 hFE minimum gain means for your drive circuit
The DC current gain is specified at 250 minimum when tested at 100 mA collector current with 1 V VCE. This relatively high gain means the base drive current required to saturate the transistor is low — for a 500 mA load, the base current needed is under 2 mA even at the minimum gain. That keeps the upstream driver stage simple and reduces component count in applications like relay drivers, solenoid drivers, and low-side switches.
Switching speed and saturation voltage
With a 200 MHz transition frequency, this transistor can handle moderate-speed switching in DC-DC converters and signal amplification up to several MHz. The VCE saturation voltage is specified at 700 mV maximum at 50 mA base current and 500 mA collector current — a typical figure for a general-purpose PNP in this current range. The 100 nA maximum collector cutoff current (ICBO) keeps leakage negligible in high-impedance circuits.
Package and footprint — SOT-23-3
The BC80740E6327 comes in the industry-standard SOT-23-3 surface-mount package (Infineon code PG-SOT23-3-11). The three-pin footprint is common across the BC807/BC817 family and many other small-signal transistors, making it straightforward to swap in during layout or BOM revision. The Bulk shipping form means it arrives in tubes or trays, not tape-and-reel — factor that into your pick-and-place setup if you are ordering for automated assembly.
Lifecycle and production status
Infineon lists the BC80740E6327 with an Active product status. For dual-sourcing resilience, the BC807 series has multiple hFE-grade variants (BC807-16, BC807-25, BC807-40) that share the same SOT-23-3 footprint and electrical ratings, differing only in the gain bin.