The MMST4401-7-F from Diodes Incorporated is a Bipolar Junction Transistor with Emitter Base Voltage 6 V, Base Emitter Saturation Voltage 0.75 to 1.2 V, Collector Base Voltage 60 V, Collector Emitter Breakdown Voltage 40 V, Collector Emitter Voltage 40 V. Tags: Surface Mount, NPN Transistor. More details for MMST4401-7-F can be seen below.