Last Buy — plan your final order
The BCR523E6327HTSA1 carries a Last Buy lifecycle status. This is the final production window — once stock clears, the part will not be manufactured again. If this transistor is on your BOM, now is the time to secure lifetime buy quantities or qualify a replacement.
Pre-biased NPN in SOT-23-3 — what the ratings mean
This is an NPN pre-biased transistor with integrated bias resistors: 1 kΩ base (R1) and 10 kΩ emitter-base (R2). The built-in resistor network eliminates two external passives per transistor, shrinking board area and reducing pick-and-place cost. Collector current is rated 500 mA continuous, with a collector-emitter breakdown of 50 V — suitable for low-side switching in 12 V and 24 V industrial loads, relay drivers, and logic-level interface circuits. Transition frequency of 100 MHz is adequate for PWM switching up to several megahertz.
330 mW power dissipation — thermal budget in a small package
Maximum power dissipation is 330 mW. In a SOT-23-3, that limits continuous collector current at higher ambient temperatures. For a 50 mA load at 5 V Vce, dissipation is about 250 mW — within the limit at 25 °C ambient, but derating above 85 °C requires checking the thermal curve. If your design runs the transistor near 500 mA with significant Vce, plan for a larger package or parallel devices.