Download the BCX59 datasheet PDF.
This datasheet also includes the BCX58 variant, as both parts are published together in a single manufacturer document.
MAXIMUM RATINGS
Rating Symbol Collector-Emitter Voltage
Collector-Base Voltage
Emitter-Base Voltage Collector Current - Continuous
@Total Device Dissipation Ta = 25°C
Derate above 25°C
Total Device.