The 2SC3649S-TD-E from onsemi is a Bipolar Junction Transistor with Emitter Base Voltage 6 V, Base Emitter Saturation Voltage 0.85 to 1.2 V, Emitter Cut off Current 1 uA, Collector Base Voltage 180 V, Collector Cut off Current 1 µA. Tags: Surface Mount, NPN Transistor. More details for 2SC3649S-TD-E can be seen below.