The MMBTA44A from Diotec Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage 6 V, Base Emitter Saturation Voltage 800 mV, Emitter Cut off Current 100 nA, Collector Base Voltage 400 V, Collector Cut off Current 100 nA. Tags: Surface Mount, NPN Transistor. More details for MMBTA44A can be seen below.