The 2SC4548-E from SeCoS Corporation is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Base Emitter Saturation Voltage 1 V, Emitter Cut off Current 0.1 µA, Collector Base Voltage 400 V, Collector Cut off Current 0.1 µA. Tags: Surface Mount, NPN Transistor. More details for 2SC4548-E can be seen below.