NPN type: This means it allows current to flow from collector to emitter when the base is driven high (positive for NPN). 100V Collector-Emitter voltage: This is the maximum voltage that can be applied between the collector and emitter terminals. 10A Collector current: This is the maximum current that can flow through the collector. Power: This is the maximum power that the transistor can dissipate. package: This is a common type of package for power transistors.