The MMBT4403 from Diotec Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Base Emitter Saturation Voltage 0.75 to 1.3 V, Emitter Cut off Current 100 nA, Collector Base Voltage 40 V, Collector Cut off Current 100 nA. Tags: Surface Mount, PNP Transistor. More details for MMBT4403 can be seen below.