The Infineon BCR 519 E6327 is an NPN pre-biased transistor in a PG-SOT23 package. The integrated 4.7 kOhms base resistor (R1) eliminates the external base resistor, saving board space and reducing component count in switching and driver applications. With a 500 mA maximum collector current and 50 V Vce breakdown, it suits low-to-medium current loads in industrial control, relay drivers, and logic-level interface circuits. The 100 MHz transition frequency supports moderate-speed switching up to a few megahertz.
The 330 mW maximum power limit sets the thermal budget for this PG-SOT23 package. At 500 mA collector current, even a 300 mV Vce saturation drop dissipates 150 mW, leaving 180 mW headroom under the limit at 25 °C ambient. In a cramped board with limited copper area, derating is necessary — the junction-to-ambient thermal resistance of a SOT-23 on standard FR4 is typically around 300 °C/W, so the 330 mW ceiling corresponds to roughly a 100 °C junction rise above ambient. For continuous operation above 85 °C ambient, reduce the load current accordingly.
Obsolete — sourcing path for the BOM
Infineon lists the BCR 519 E6327 as obsolete. No official replacement order code is provided in the lifecycle record. For new designs, a pin-compatible pre-biased NPN in the same SOT-23 footprint should be selected after verifying base resistor value and current rating.