BCR108:NPN Silicon Digital Transistor什么意思？

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   NPN Silicon Digital Transistor
? Switching circuit, inverter, interface circuit,
driver circuit；
? Built in bias resistor (R1=2.2kΩ, R2=47kΩ)；
? For 6-PIN packages: two (galvanic) internal isolated transistors with good matching in one package。 怎么用呢？如果用它来驱动用作电源指示灯的发光二极管，干么不直接用FPGA的IO口驱动呢？